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-<html lang="en-GB-oxendict"><head><meta charset="utf-8"><meta property="og:image" content="https://tc39.es/ecmarkup/ecma-logo.png"><meta property="og:title" content="ECMAScript® 2024 Internationalization API Specification"><meta property="og:description" content="Introduction
+<html lang="en-GB-oxendict"><head><meta charset="utf-8"><meta property="og:image" content="https://tc39.es/ecmarkup/ecma-logo.png"><meta property="og:title" content="ECMAScript® 2025 Internationalization API Specification"><meta property="og:description" content="Introduction
   
     This specification's source can be found at https://github.com/tc39/ecma402.
   
   
-    The ECMAScript 2024 Internationalization API Specification (ECMA-402 11th Edition), provides key language sensitive functionality as a complement to the ECMAScript 2024 Language Specificatio">
+    The ECMAScript 2025 Internationalization API Specification (ECMA-402 12th Edition), provides key language sensitive functionality as a complement to the ECMAScript 2025 Language Specificatio">
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@@ -81,7 +81,7 @@
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class="item-toggle">+</span><a href="#overview" title="Overview"><span class="secnum">4</span> Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internationalization-localization-globalization" title="Internationalization, Localization, and Globalization"><span class="secnum">4.1</span> Internationalization, Localization, and Globalization</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-overview" title="API Overview"><span class="secnum">4.2</span> API Overview</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-conventions" title="API Conventions"><span class="secnum">4.3</span> API Conventions</a></li><li><span class="item-toggle">+</span><a href="#sec-implementation-dependencies" title="Implementation Dependencies"><span class="secnum">4.4</span> Implementation Dependencies</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-compatibility" title="Compatibility across implementations"><span class="secnum">4.4.1</span> Compatibility across implementations</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#conventions" title="Notational Conventions"><span class="secnum">5</span> Notational Conventions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-402-well-known-intrinsic-objects" title="Well-Known Intrinsic Objects"><span class="secnum">5.1</span> Well-Known Intrinsic Objects</a></li></ol></li><li><span class="item-toggle">+</span><a href="#locales-currencies-tz" title="Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars"><span class="secnum">6</span> Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-case-sensitivity-and-case-mapping" title="Case Sensitivity and Case Mapping"><span class="secnum">6.1</span> Case Sensitivity and Case Mapping</a></li><li><span class="item-toggle">+</span><a href="#sec-language-tags" title="Language Tags"><span class="secnum">6.2</span> Language Tags</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-isstructurallyvalidlanguagetag" title="IsStructurallyValidLanguageTag ( locale )"><span class="secnum">6.2.1</span> IsStructurallyValidLanguageTag ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeunicodelocaleid" title="CanonicalizeUnicodeLocaleId ( locale )"><span class="secnum">6.2.2</span> CanonicalizeUnicodeLocaleId ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultlocale" title="DefaultLocale ( )"><span class="secnum">6.2.3</span> DefaultLocale ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-currency-codes" title="Currency Codes"><span class="secnum">6.3</span> Currency Codes</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedcurrencycode" title="IsWellFormedCurrencyCode ( currency )"><span class="secnum">6.3.1</span> IsWellFormedCurrencyCode ( <var>currency</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcurrencies" title="AvailableCanonicalCurrencies ( )"><span class="secnum">6.4</span> AvailableCanonicalCurrencies ( )</a></li><li><span class="item-toggle">+</span><a href="#sec-use-of-iana-time-zone-database" title="Use of the IANA Time Zone Database"><span class="secnum">6.5</span> Use of the IANA Time Zone Database</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-availablenamedtimezoneidentifiers" title="AvailableNamedTimeZoneIdentifiers ( )"><span class="secnum">6.5.1</span> AvailableNamedTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getavailablenamedtimezoneidentifier" title="GetAvailableNamedTimeZoneIdentifier ( timeZoneIdentifier )"><span class="secnum">6.5.2</span> GetAvailableNamedTimeZoneIdentifier ( <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availableprimarytimezoneidentifiers" title="AvailablePrimaryTimeZoneIdentifiers ( )"><span class="secnum">6.5.3</span> AvailablePrimaryTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-string-split-to-list" title="StringSplitToList ( S, separator )"><span class="secnum">6.5.4</span> StringSplitToList ( <var>S</var>, <var>separator</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-measurement-unit-identifiers" title="Measurement Unit Identifiers"><span class="secnum">6.6</span> Measurement Unit Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedunitidentifier" title="IsWellFormedUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.1</span> IsWellFormedUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-issanctionedsingleunitidentifier" title="IsSanctionedSingleUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.2</span> IsSanctionedSingleUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalunits" title="AvailableCanonicalUnits ( )"><span class="secnum">6.6.3</span> AvailableCanonicalUnits ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numberingsystem-identifiers" title="Numbering System Identifiers"><span class="secnum">6.7</span> Numbering System Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalnumberingsystems" title="AvailableCanonicalNumberingSystems ( )"><span class="secnum">6.7.1</span> AvailableCanonicalNumberingSystems ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-collation-types" title="Collation Types"><span class="secnum">6.8</span> Collation Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcollations" title="AvailableCanonicalCollations ( )"><span class="secnum">6.8.1</span> AvailableCanonicalCollations ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-calendar-types" title="Calendar Types"><span class="secnum">6.9</span> Calendar Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecalendars" title="AvailableCalendars ( )"><span class="secnum">6.9.1</span> AvailableCalendars ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-pattern-string-types" title="Pattern String Types"><span class="secnum">6.10</span> Pattern String Types</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#requirements" title="Requirements for Standard Built-in ECMAScript Objects"><span class="secnum">7</span> Requirements for Standard Built-in ECMAScript Objects</a></li><li><span class="item-toggle">+</span><a href="#intl-object" title="The Intl Object"><span class="secnum">8</span> The Intl Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-value-properties-of-the-intl-object" title="Value Properties of the Intl Object"><span class="secnum">8.1</span> Value Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl-%symbol.tostringtag%" title="Intl [ %Symbol.toStringTag% ]"><span class="secnum">8.1.1</span> Intl [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-constructor-properties-of-the-intl-object" title="Constructor Properties of the Intl Object"><span class="secnum">8.2</span> Constructor Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator-intro" title="Intl.Collator ( . . . )"><span class="secnum">8.2.1</span> Intl.Collator ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat-intro" title="Intl.DateTimeFormat ( . . . )"><span class="secnum">8.2.2</span> Intl.DateTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames-intro" title="Intl.DisplayNames ( . . . )"><span class="secnum">8.2.3</span> Intl.DisplayNames ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.listformat-intro" title="Intl.ListFormat ( . . . )"><span class="secnum">8.2.4</span> Intl.ListFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-intro" title="Intl.Locale ( . . . )"><span class="secnum">8.2.5</span> Intl.Locale ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-intro" title="Intl.NumberFormat ( . . . )"><span class="secnum">8.2.6</span> Intl.NumberFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-intro" title="Intl.PluralRules ( . . . )"><span class="secnum">8.2.7</span> Intl.PluralRules ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat-intro" title="Intl.RelativeTimeFormat ( . . . )"><span class="secnum">8.2.8</span> Intl.RelativeTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-intro" title="Intl.Segmenter ( . . . )"><span class="secnum">8.2.9</span> Intl.Segmenter ( . . . )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-properties-of-the-intl-object" title="Function Properties of the Intl Object"><span class="secnum">8.3</span> Function Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.getcanonicallocales" title="Intl.getCanonicalLocales ( locales )"><span class="secnum">8.3.1</span> Intl.getCanonicalLocales ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.supportedvaluesof" title="Intl.supportedValuesOf ( key )"><span class="secnum">8.3.2</span> Intl.supportedValuesOf ( <var>key</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-and-parameter-negotiation" title="Locale and Parameter Negotiation"><span class="secnum">9</span> Locale and Parameter Negotiation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internal-slots" title="Internal slots of Service Constructors"><span class="secnum">9.1</span> Internal slots of Service Constructors</a></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">9.2</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalizelocalelist" title="CanonicalizeLocaleList ( locales )"><span class="secnum">9.2.1</span> CanonicalizeLocaleList ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeuvalue" title="CanonicalizeUValue ( ukey, uvalue )"><span class="secnum">9.2.2</span> CanonicalizeUValue ( <var>ukey</var>, <var>uvalue</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebyprefix" title="LookupMatchingLocaleByPrefix ( availableLocales, requestedLocales )"><span class="secnum">9.2.3</span> LookupMatchingLocaleByPrefix ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebybestfit" title="LookupMatchingLocaleByBestFit ( availableLocales, requestedLocales )"><span class="secnum">9.2.4</span> LookupMatchingLocaleByBestFit ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unicode-extension-components" title="UnicodeExtensionComponents ( extension )"><span class="secnum">9.2.5</span> UnicodeExtensionComponents ( <var>extension</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-insert-unicode-extension-and-canonicalize" title="InsertUnicodeExtensionAndCanonicalize ( locale, attributes, keywords )"><span class="secnum">9.2.6</span> InsertUnicodeExtensionAndCanonicalize ( <var>locale</var>, <var>attributes</var>, <var>keywords</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvelocale" title="ResolveLocale ( availableLocales, requestedLocales, options, relevantExtensionKeys, localeData )"><span class="secnum">9.2.7</span> ResolveLocale ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var>, <var>relevantExtensionKeys</var>, <var>localeData</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-filterlocales" title="FilterLocales ( availableLocales, requestedLocales, options )"><span class="secnum">9.2.8</span> FilterLocales ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoptionsobject" title="GetOptionsObject ( options )"><span class="secnum">9.2.9</span> GetOptionsObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-coerceoptionstoobject" title="CoerceOptionsToObject ( options )"><span class="secnum">9.2.10</span> CoerceOptionsToObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoption" title="GetOption ( options, property, type, values, default )"><span class="secnum">9.2.11</span> GetOption ( <var>options</var>, <var>property</var>, <var>type</var>, <var>values</var>, <var>default</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getbooleanorstringnumberformatoption" title="GetBooleanOrStringNumberFormatOption ( options, property, stringValues, fallback )"><span class="secnum">9.2.12</span> GetBooleanOrStringNumberFormatOption ( <var>options</var>, <var>property</var>, <var>stringValues</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultnumberoption" title="DefaultNumberOption ( value, minimum, maximum, fallback )"><span class="secnum">9.2.13</span> DefaultNumberOption ( <var>value</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberoption" title="GetNumberOption ( options, property, minimum, maximum, fallback )"><span class="secnum">9.2.14</span> GetNumberOption ( <var>options</var>, <var>property</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionpattern" title="PartitionPattern ( pattern )"><span class="secnum">9.2.15</span> PartitionPattern ( <var>pattern</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#collator-objects" title="Collator Objects"><span class="secnum">10</span> Collator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-the-intl-collator-constructor" title="The Intl.Collator Constructor"><span class="secnum">10.1</span> The Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator" title="Intl.Collator ( [ locales [ , options ] ] )"><span class="secnum">10.1.1</span> Intl.Collator ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-constructor" title="Properties of the Intl.Collator Constructor"><span class="secnum">10.2</span> Properties of the Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype" title="Intl.Collator.prototype"><span class="secnum">10.2.1</span> Intl.Collator.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.supportedlocalesof" title="Intl.Collator.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">10.2.2</span> Intl.Collator.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl-collator-internal-slots" title="Internal slots"><span class="secnum">10.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-prototype-object" title="Properties of the Intl.Collator Prototype Object"><span class="secnum">10.3</span> Properties of the Intl.Collator Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.constructor" title="Intl.Collator.prototype.constructor"><span class="secnum">10.3.1</span> Intl.Collator.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype-%symbol.tostringtag%" title="Intl.Collator.prototype [ %Symbol.toStringTag% ]"><span class="secnum">10.3.2</span> Intl.Collator.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.collator.prototype.compare" title="get Intl.Collator.prototype.compare"><span class="secnum">10.3.3</span> get Intl.Collator.prototype.compare</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-collator-compare-functions" title="Collator Compare Functions"><span class="secnum">10.3.3.1</span> Collator Compare Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-collator-comparestrings" title="CompareStrings ( collator, x, y )"><span class="secnum">10.3.3.2</span> CompareStrings ( <var>collator</var>, <var>x</var>, <var>y</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.resolvedoptions" title="Intl.Collator.prototype.resolvedOptions ( )"><span class="secnum">10.3.4</span> Intl.Collator.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-collator-instances" title="Properties of Intl.Collator Instances"><span class="secnum">10.4</span> Properties of Intl.Collator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#datetimeformat-objects" title="DateTimeFormat Objects"><span class="secnum">11</span> DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-datetimeformat-constructor" title="The Intl.DateTimeFormat Constructor"><span class="secnum">11.1</span> The Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat" title="Intl.DateTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">11.1.1</span> Intl.DateTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chaindatetimeformat" title="ChainDateTimeFormat ( dateTimeFormat, newTarget, this )"><span class="secnum">11.1.1.1</span> ChainDateTimeFormat ( <var>dateTimeFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-createdatetimeformat" title="CreateDateTimeFormat ( newTarget, locales, options, required, defaults )"><span class="secnum">11.1.2</span> CreateDateTimeFormat ( <var>newTarget</var>, <var>locales</var>, <var>options</var>, <var>required</var>, <var>defaults</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatoffsettimezoneidentifier" title="FormatOffsetTimeZoneIdentifier ( offsetMinutes )"><span class="secnum">11.1.3</span> FormatOffsetTimeZoneIdentifier ( <var>offsetMinutes</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-constructor" title="Properties of the Intl.DateTimeFormat Constructor"><span class="secnum">11.2</span> Properties of the Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype" title="Intl.DateTimeFormat.prototype"><span class="secnum">11.2.1</span> Intl.DateTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.supportedlocalesof" title="Intl.DateTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">11.2.2</span> Intl.DateTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat-internal-slots" title="Internal slots"><span class="secnum">11.2.3</span> Internal slots</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-format-record" title="DateTime Format Records"><span class="secnum">11.2.3.1</span> DateTime Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-record" title="DateTime Range Pattern Records"><span class="secnum">11.2.3.2</span> DateTime Range Pattern Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-format-record" title="DateTime Range Pattern Format Records"><span class="secnum">11.2.3.3</span> DateTime Range Pattern Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-part-record" title="DateTime Range Pattern Part Records"><span class="secnum">11.2.3.4</span> DateTime Range Pattern Part Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-styles-record" title="DateTime Styles Records"><span class="secnum">11.2.3.5</span> DateTime Styles Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-record" title="DateTime Style Records"><span class="secnum">11.2.3.6</span> DateTime Style Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-connector-record" title="DateTime Connector Records"><span class="secnum">11.2.3.7</span> DateTime Connector Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-date-range-record" title="DateTime Date Range Records"><span class="secnum">11.2.3.8</span> DateTime Date Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-time-range-record" title="DateTime Time Range Records"><span class="secnum">11.2.3.9</span> DateTime Time Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-range-record" title="DateTime Style Range Records"><span class="secnum">11.2.3.10</span> DateTime Style Range Records</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-prototype-object" title="Properties of the Intl.DateTimeFormat Prototype Object"><span class="secnum">11.3</span> Properties of the Intl.DateTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.constructor" title="Intl.DateTimeFormat.prototype.constructor"><span class="secnum">11.3.1</span> Intl.DateTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype-%symbol.tostringtag%" title="Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">11.3.2</span> Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.format" title="get Intl.DateTimeFormat.prototype.format"><span class="secnum">11.3.3</span> get Intl.DateTimeFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatToParts" title="Intl.DateTimeFormat.prototype.formatToParts ( date )"><span class="secnum">11.3.4</span> Intl.DateTimeFormat.prototype.formatToParts ( <var>date</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.formatRange" title="Intl.DateTimeFormat.prototype.formatRange ( startDate, endDate )"><span class="secnum">11.3.5</span> Intl.DateTimeFormat.prototype.formatRange ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatRangeToParts" title="Intl.DateTimeFormat.prototype.formatRangeToParts ( startDate, endDate )"><span class="secnum">11.3.6</span> Intl.DateTimeFormat.prototype.formatRangeToParts ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.resolvedoptions" title="Intl.DateTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">11.3.7</span> Intl.DateTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-datetimeformat-instances" title="Properties of Intl.DateTimeFormat Instances"><span class="secnum">11.4</span> Properties of Intl.DateTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-datetimeformat-abstracts" title="Abstract Operations for DateTimeFormat Objects"><span class="secnum">11.5</span> Abstract Operations for DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-time-style-format" title="DateTimeStyleFormat ( dateStyle, timeStyle, styles )"><span class="secnum">11.5.1</span> DateTimeStyleFormat ( <var>dateStyle</var>, <var>timeStyle</var>, <var>styles</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-basicformatmatcher" title="BasicFormatMatcher ( options, formats )"><span class="secnum">11.5.2</span> BasicFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-bestfitformatmatcher" title="BestFitFormatMatcher ( options, formats )"><span class="secnum">11.5.3</span> BestFitFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetime-format-functions" title="DateTime Format Functions"><span class="secnum">11.5.4</span> DateTime Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimepattern" title="FormatDateTimePattern ( dateTimeFormat, format, pattern, epochNanoseconds )"><span class="secnum">11.5.5</span> FormatDateTimePattern ( <var>dateTimeFormat</var>, <var>format</var>, <var>pattern</var>, <var>epochNanoseconds</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimepattern" title="PartitionDateTimePattern ( dateTimeFormat, x )"><span class="secnum">11.5.6</span> PartitionDateTimePattern ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetime" title="FormatDateTime ( dateTimeFormat, x )"><span class="secnum">11.5.7</span> FormatDateTime ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimetoparts" title="FormatDateTimeToParts ( dateTimeFormat, x )"><span class="secnum">11.5.8</span> FormatDateTimeToParts ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimerangepattern" title="PartitionDateTimeRangePattern ( dateTimeFormat, x, y )"><span class="secnum">11.5.9</span> PartitionDateTimeRangePattern ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerange" title="FormatDateTimeRange ( dateTimeFormat, x, y )"><span class="secnum">11.5.10</span> FormatDateTimeRange ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerangetoparts" title="FormatDateTimeRangeToParts ( dateTimeFormat, x, y )"><span class="secnum">11.5.11</span> FormatDateTimeRangeToParts ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-tolocaltime" title="ToLocalTime ( epochNs, calendar, timeZoneIdentifier )"><span class="secnum">11.5.12</span> ToLocalTime ( <var>epochNs</var>, <var>calendar</var>, <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-tolocaltime-records" title="ToLocalTime Records"><span class="secnum">11.5.13</span> ToLocalTime Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapdatetimeformat" title="UnwrapDateTimeFormat ( dtf )"><span class="secnum">11.5.14</span> UnwrapDateTimeFormat ( <var>dtf</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#intl-displaynames-objects" title="DisplayNames Objects"><span class="secnum">12</span> DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-constructor" title="The Intl.DisplayNames Constructor"><span class="secnum">12.1</span> The Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames" title="Intl.DisplayNames ( locales, options )"><span class="secnum">12.1.1</span> Intl.DisplayNames ( <var>locales</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-constructor" title="Properties of the Intl.DisplayNames Constructor"><span class="secnum">12.2</span> Properties of the Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype" title="Intl.DisplayNames.prototype"><span class="secnum">12.2.1</span> Intl.DisplayNames.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.supportedLocalesOf" title="Intl.DisplayNames.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">12.2.2</span> Intl.DisplayNames.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames-internal-slots" title="Internal slots"><span class="secnum">12.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-prototype-object" title="Properties of the Intl.DisplayNames Prototype Object"><span class="secnum">12.3</span> Properties of the Intl.DisplayNames Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.constructor" title="Intl.DisplayNames.prototype.constructor"><span class="secnum">12.3.1</span> Intl.DisplayNames.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames.prototype-%symbol.tostringtag%" title="Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]"><span class="secnum">12.3.2</span> Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.of" title="Intl.DisplayNames.prototype.of ( code )"><span class="secnum">12.3.3</span> Intl.DisplayNames.prototype.of ( <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.resolvedOptions" title="Intl.DisplayNames.prototype.resolvedOptions ( )"><span class="secnum">12.3.4</span> Intl.DisplayNames.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-displaynames-instances" title="Properties of Intl.DisplayNames Instances"><span class="secnum">12.4</span> Properties of Intl.DisplayNames Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-abstracts" title="Abstract Operations for DisplayNames Objects"><span class="secnum">12.5</span> Abstract Operations for DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalcodefordisplaynames" title="CanonicalCodeForDisplayNames ( type, code )"><span class="secnum">12.5.1</span> CanonicalCodeForDisplayNames ( <var>type</var>, <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvaliddatetimefieldcode" title="IsValidDateTimeFieldCode ( field )"><span class="secnum">12.5.2</span> IsValidDateTimeFieldCode ( <var>field</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#listformat-objects" title="ListFormat Objects"><span class="secnum">13</span> ListFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-constructor" title="The Intl.ListFormat Constructor"><span class="secnum">13.1</span> The Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat" title="Intl.ListFormat ( [ locales [ , options ] ] )"><span class="secnum">13.1.1</span> Intl.ListFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-constructor" title="Properties of the Intl.ListFormat Constructor"><span class="secnum">13.2</span> Properties of the Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype" title="Intl.ListFormat.prototype"><span class="secnum">13.2.1</span> Intl.ListFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.supportedLocalesOf" title="Intl.ListFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">13.2.2</span> Intl.ListFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat-internal-slots" title="Internal slots"><span class="secnum">13.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-prototype-object" title="Properties of the Intl.ListFormat Prototype Object"><span class="secnum">13.3</span> Properties of the Intl.ListFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.constructor" title="Intl.ListFormat.prototype.constructor"><span class="secnum">13.3.1</span> Intl.ListFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype-toStringTag" title="Intl.ListFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">13.3.2</span> Intl.ListFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.format" title="Intl.ListFormat.prototype.format ( list )"><span class="secnum">13.3.3</span> Intl.ListFormat.prototype.format ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.formatToParts" title="Intl.ListFormat.prototype.formatToParts ( list )"><span class="secnum">13.3.4</span> Intl.ListFormat.prototype.formatToParts ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.resolvedoptions" title="Intl.ListFormat.prototype.resolvedOptions ( )"><span class="secnum">13.3.5</span> Intl.ListFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-listformat-instances" title="Properties of Intl.ListFormat Instances"><span class="secnum">13.4</span> Properties of Intl.ListFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-abstracts" title="Abstract Operations for ListFormat Objects"><span class="secnum">13.5</span> Abstract Operations for ListFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-deconstructpattern" title="DeconstructPattern ( pattern, placeables )"><span class="secnum">13.5.1</span> DeconstructPattern ( <var>pattern</var>, <var>placeables</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createpartsfromlist" title="CreatePartsFromList ( listFormat, list )"><span class="secnum">13.5.2</span> CreatePartsFromList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlist" title="FormatList ( listFormat, list )"><span class="secnum">13.5.3</span> FormatList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlisttoparts" title="FormatListToParts ( listFormat, list )"><span class="secnum">13.5.4</span> FormatListToParts ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createstringlistfromiterable" title="StringListFromIterable ( iterable )"><span class="secnum">13.5.5</span> StringListFromIterable ( <var>iterable</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-objects" title="Locale Objects"><span class="secnum">14</span> Locale Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-locale-constructor" title="The Intl.Locale Constructor"><span class="secnum">14.1</span> The Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale" title="Intl.Locale ( tag [ , options ] )"><span class="secnum">14.1.1</span> Intl.Locale ( <var>tag</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-updatelanguageid" title="UpdateLanguageId ( tag, options )"><span class="secnum">14.1.2</span> UpdateLanguageId ( <var>tag</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makelocalerecord" title="MakeLocaleRecord ( tag, options, localeExtensionKeys )"><span class="secnum">14.1.3</span> MakeLocaleRecord ( <var>tag</var>, <var>options</var>, <var>localeExtensionKeys</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-constructor" title="Properties of the Intl.Locale Constructor"><span class="secnum">14.2</span> Properties of the Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype" title="Intl.Locale.prototype"><span class="secnum">14.2.1</span> Intl.Locale.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-internal-slots" title="Internal slots"><span class="secnum">14.2.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-prototype-object" title="Properties of the Intl.Locale Prototype Object"><span class="secnum">14.3</span> Properties of the Intl.Locale Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.constructor" title="Intl.Locale.prototype.constructor"><span class="secnum">14.3.1</span> Intl.Locale.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale.prototype-%symbol.tostringtag%" title="Intl.Locale.prototype [ %Symbol.toStringTag% ]"><span class="secnum">14.3.2</span> Intl.Locale.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.maximize" title="Intl.Locale.prototype.maximize ( )"><span class="secnum">14.3.3</span> Intl.Locale.prototype.maximize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.minimize" title="Intl.Locale.prototype.minimize ( )"><span class="secnum">14.3.4</span> Intl.Locale.prototype.minimize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.toString" title="Intl.Locale.prototype.toString ( )"><span class="secnum">14.3.5</span> Intl.Locale.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.baseName" title="get Intl.Locale.prototype.baseName"><span class="secnum">14.3.6</span> get Intl.Locale.prototype.baseName</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.calendar" title="get Intl.Locale.prototype.calendar"><span class="secnum">14.3.7</span> get Intl.Locale.prototype.calendar</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.caseFirst" title="get Intl.Locale.prototype.caseFirst"><span class="secnum">14.3.8</span> get Intl.Locale.prototype.caseFirst</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.collation" title="get Intl.Locale.prototype.collation"><span class="secnum">14.3.9</span> get Intl.Locale.prototype.collation</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.hourCycle" title="get Intl.Locale.prototype.hourCycle"><span class="secnum">14.3.10</span> get Intl.Locale.prototype.hourCycle</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numeric" title="get Intl.Locale.prototype.numeric"><span class="secnum">14.3.11</span> get Intl.Locale.prototype.numeric</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numberingSystem" title="get Intl.Locale.prototype.numberingSystem"><span class="secnum">14.3.12</span> get Intl.Locale.prototype.numberingSystem</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.language" title="get Intl.Locale.prototype.language"><span class="secnum">14.3.13</span> get Intl.Locale.prototype.language</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.script" title="get Intl.Locale.prototype.script"><span class="secnum">14.3.14</span> get Intl.Locale.prototype.script</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.region" title="get Intl.Locale.prototype.region"><span class="secnum">14.3.15</span> get Intl.Locale.prototype.region</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-locale-instances" title="Properties of Intl.Locale Instances"><span class="secnum">14.4</span> Properties of Intl.Locale Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-locale-abstracts" title="Abstract Operations for Locale Objects"><span class="secnum">14.5</span> Abstract Operations for Locale Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getlocalebasename" title="GetLocaleBaseName ( locale )"><span class="secnum">14.5.1</span> GetLocaleBaseName ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalelanguage" title="GetLocaleLanguage ( locale )"><span class="secnum">14.5.2</span> GetLocaleLanguage ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalescript" title="GetLocaleScript ( locale )"><span class="secnum">14.5.3</span> GetLocaleScript ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocaleregion" title="GetLocaleRegion ( locale )"><span class="secnum">14.5.4</span> GetLocaleRegion ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalevariants" title="GetLocaleVariants ( locale )"><span class="secnum">14.5.5</span> GetLocaleVariants ( <var>locale</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#numberformat-objects" title="NumberFormat Objects"><span class="secnum">15</span> NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-numberformat-constructor" title="The Intl.NumberFormat Constructor"><span class="secnum">15.1</span> The Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.numberformat" title="Intl.NumberFormat ( [ locales [ , options ] ] )"><span class="secnum">15.1.1</span> Intl.NumberFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chainnumberformat" title="ChainNumberFormat ( numberFormat, newTarget, this )"><span class="secnum">15.1.1.1</span> ChainNumberFormat ( <var>numberFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-setnfdigitoptions" title="SetNumberFormatDigitOptions ( intlObj, options, mnfdDefault, mxfdDefault, notation )"><span class="secnum">15.1.2</span> SetNumberFormatDigitOptions ( <var>intlObj</var>, <var>options</var>, <var>mnfdDefault</var>, <var>mxfdDefault</var>, <var>notation</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-setnumberformatunitoptions" title="SetNumberFormatUnitOptions ( intlObj, options )"><span class="secnum">15.1.3</span> SetNumberFormatUnitOptions ( <var>intlObj</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-constructor" title="Properties of the Intl.NumberFormat Constructor"><span class="secnum">15.2</span> Properties of the Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype" title="Intl.NumberFormat.prototype"><span class="secnum">15.2.1</span> Intl.NumberFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.supportedlocalesof" title="Intl.NumberFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">15.2.2</span> Intl.NumberFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-internal-slots" title="Internal slots"><span class="secnum">15.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-prototype-object" title="Properties of the Intl.NumberFormat Prototype Object"><span class="secnum">15.3</span> Properties of the Intl.NumberFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.constructor" title="Intl.NumberFormat.prototype.constructor"><span class="secnum">15.3.1</span> Intl.NumberFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype-%symbol.tostringtag%" title="Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">15.3.2</span> Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.format" title="get Intl.NumberFormat.prototype.format"><span class="secnum">15.3.3</span> get Intl.NumberFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formattoparts" title="Intl.NumberFormat.prototype.formatToParts ( value )"><span class="secnum">15.3.4</span> Intl.NumberFormat.prototype.formatToParts ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrange" title="Intl.NumberFormat.prototype.formatRange ( start, end )"><span class="secnum">15.3.5</span> Intl.NumberFormat.prototype.formatRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrangetoparts" title="Intl.NumberFormat.prototype.formatRangeToParts ( start, end )"><span class="secnum">15.3.6</span> Intl.NumberFormat.prototype.formatRangeToParts ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.resolvedoptions" title="Intl.NumberFormat.prototype.resolvedOptions ( )"><span class="secnum">15.3.7</span> Intl.NumberFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-numberformat-instances" title="Properties of Intl.NumberFormat Instances"><span class="secnum">15.4</span> Properties of Intl.NumberFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-numberformat-abstracts" title="Abstract Operations for NumberFormat Objects"><span class="secnum">15.5</span> Abstract Operations for NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-currencydigits" title="CurrencyDigits ( currency )"><span class="secnum">15.5.1</span> CurrencyDigits ( <var>currency</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-number-format-functions" title="Number Format Functions"><span class="secnum">15.5.2</span> Number Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumberstring" title="FormatNumericToString ( intlObject, x )"><span class="secnum">15.5.3</span> FormatNumericToString ( <var>intlObject</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberpattern" title="PartitionNumberPattern ( numberFormat, x )"><span class="secnum">15.5.4</span> PartitionNumberPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnotationsubpattern" title="PartitionNotationSubPattern ( numberFormat, x, n, exponent )"><span class="secnum">15.5.5</span> PartitionNotationSubPattern ( <var>numberFormat</var>, <var>x</var>, <var>n</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumber" title="FormatNumeric ( numberFormat, x )"><span class="secnum">15.5.6</span> FormatNumeric ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumbertoparts" title="FormatNumericToParts ( numberFormat, x )"><span class="secnum">15.5.7</span> FormatNumericToParts ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawprecision" title="ToRawPrecision ( x, minPrecision, maxPrecision, unsignedRoundingMode )"><span class="secnum">15.5.8</span> ToRawPrecision ( <var>x</var>, <var>minPrecision</var>, <var>maxPrecision</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawfixed" title="ToRawFixed ( x, minFraction, maxFraction, roundingIncrement, unsignedRoundingMode )"><span class="secnum">15.5.9</span> ToRawFixed ( <var>x</var>, <var>minFraction</var>, <var>maxFraction</var>, <var>roundingIncrement</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapnumberformat" title="UnwrapNumberFormat ( nf )"><span class="secnum">15.5.10</span> UnwrapNumberFormat ( <var>nf</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberformatpattern" title="GetNumberFormatPattern ( numberFormat, x )"><span class="secnum">15.5.11</span> GetNumberFormatPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnotationsubpattern" title="GetNotationSubPattern ( numberFormat, exponent )"><span class="secnum">15.5.12</span> GetNotationSubPattern ( <var>numberFormat</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponent" title="ComputeExponent ( numberFormat, x )"><span class="secnum">15.5.13</span> ComputeExponent ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponentformagnitude" title="ComputeExponentForMagnitude ( numberFormat, magnitude )"><span class="secnum">15.5.14</span> ComputeExponentForMagnitude ( <var>numberFormat</var>, <var>magnitude</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-stringintlmv" title="Runtime Semantics: StringIntlMV"><span class="secnum">15.5.15</span> RS: StringIntlMV</a></li><li><span class="item-toggle-none"></span><a href="#sec-tointlmathematicalvalue" title="ToIntlMathematicalValue ( value )"><span class="secnum">15.5.16</span> ToIntlMathematicalValue ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getunsignedroundingmode" title="GetUnsignedRoundingMode ( roundingMode, sign )"><span class="secnum">15.5.17</span> GetUnsignedRoundingMode ( <var>roundingMode</var>, <var>sign</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-applyunsignedroundingmode" title="ApplyUnsignedRoundingMode ( x, r1, r2, unsignedRoundingMode )"><span class="secnum">15.5.18</span> ApplyUnsignedRoundingMode ( <var>x</var>, <var>r1</var>, <var>r2</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberrangepattern" title="PartitionNumberRangePattern ( numberFormat, x, y )"><span class="secnum">15.5.19</span> PartitionNumberRangePattern ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatapproximately" title="FormatApproximately ( numberFormat, result )"><span class="secnum">15.5.20</span> FormatApproximately ( <var>numberFormat</var>, <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-collapsenumberrange" title="CollapseNumberRange ( result )"><span class="secnum">15.5.21</span> CollapseNumberRange ( <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrange" title="FormatNumericRange ( numberFormat, x, y )"><span class="secnum">15.5.22</span> FormatNumericRange ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrangetoparts" title="FormatNumericRangeToParts ( numberFormat, x, y )"><span class="secnum">15.5.23</span> FormatNumericRangeToParts ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#pluralrules-objects" title="PluralRules Objects"><span class="secnum">16</span> PluralRules Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-constructor" title="The Intl.PluralRules Constructor"><span class="secnum">16.1</span> The Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules" title="Intl.PluralRules ( [ locales [ , options ] ] )"><span class="secnum">16.1.1</span> Intl.PluralRules ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-constructor" title="Properties of the Intl.PluralRules Constructor"><span class="secnum">16.2</span> Properties of the Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype" title="Intl.PluralRules.prototype"><span class="secnum">16.2.1</span> Intl.PluralRules.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.supportedlocalesof" title="Intl.PluralRules.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">16.2.2</span> Intl.PluralRules.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-internal-slots" title="Internal slots"><span class="secnum">16.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-prototype-object" title="Properties of the Intl.PluralRules Prototype Object"><span class="secnum">16.3</span> Properties of the Intl.PluralRules Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.constructor" title="Intl.PluralRules.prototype.constructor"><span class="secnum">16.3.1</span> Intl.PluralRules.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype-%symbol.tostringtag%" title="Intl.PluralRules.prototype [ %Symbol.toStringTag% ]"><span class="secnum">16.3.2</span> Intl.PluralRules.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.select" title="Intl.PluralRules.prototype.select ( value )"><span class="secnum">16.3.3</span> Intl.PluralRules.prototype.select ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.selectrange" title="Intl.PluralRules.prototype.selectRange ( start, end )"><span class="secnum">16.3.4</span> Intl.PluralRules.prototype.selectRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.resolvedoptions" title="Intl.PluralRules.prototype.resolvedOptions ( )"><span class="secnum">16.3.5</span> Intl.PluralRules.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-pluralrules-instances" title="Properties of Intl.PluralRules Instances"><span class="secnum">16.4</span> Properties of Intl.PluralRules Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-abstracts" title="Abstract Operations for PluralRules Objects"><span class="secnum">16.5</span> Abstract Operations for PluralRules Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getoperands" title="GetOperands ( s )"><span class="secnum">16.5.1</span> GetOperands ( <var>s</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-plural-rules-operands-records" title="Plural Rules Operands Records"><span class="secnum">16.5.2</span> Plural Rules Operands Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselect" title="PluralRuleSelect ( locale, type, n, operands )"><span class="secnum">16.5.3</span> PluralRuleSelect ( <var>locale</var>, <var>type</var>, <var>n</var>, <var>operands</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolveplural" title="ResolvePlural ( pluralRules, n )"><span class="secnum">16.5.4</span> ResolvePlural ( <var>pluralRules</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselectrange" title="PluralRuleSelectRange ( locale, type, xp, yp )"><span class="secnum">16.5.5</span> PluralRuleSelectRange ( <var>locale</var>, <var>type</var>, <var>xp</var>, <var>yp</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvepluralrange" title="ResolvePluralRange ( pluralRules, x, y )"><span class="secnum">16.5.6</span> ResolvePluralRange ( <var>pluralRules</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#relativetimeformat-objects" title="RelativeTimeFormat Objects"><span class="secnum">17</span> RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat-constructor" title="The Intl.RelativeTimeFormat Constructor"><span class="secnum">17.1</span> The Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat" title="Intl.RelativeTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">17.1.1</span> Intl.RelativeTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-constructor" title="Properties of the Intl.RelativeTimeFormat Constructor"><span class="secnum">17.2</span> Properties of the Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype" title="Intl.RelativeTimeFormat.prototype"><span class="secnum">17.2.1</span> Intl.RelativeTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.supportedLocalesOf" title="Intl.RelativeTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">17.2.2</span> Intl.RelativeTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat-internal-slots" title="Internal slots"><span class="secnum">17.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-prototype-object" title="Properties of the Intl.RelativeTimeFormat Prototype Object"><span class="secnum">17.3</span> Properties of the Intl.RelativeTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.constructor" title="Intl.RelativeTimeFormat.prototype.constructor"><span class="secnum">17.3.1</span> Intl.RelativeTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype-toStringTag" title="Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">17.3.2</span> Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.format" title="Intl.RelativeTimeFormat.prototype.format ( value, unit )"><span class="secnum">17.3.3</span> Intl.RelativeTimeFormat.prototype.format ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.formatToParts" title="Intl.RelativeTimeFormat.prototype.formatToParts ( value, unit )"><span class="secnum">17.3.4</span> Intl.RelativeTimeFormat.prototype.formatToParts ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat.prototype.resolvedoptions" title="Intl.RelativeTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">17.3.5</span> Intl.RelativeTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-relativetimeformat-instances" title="Properties of Intl.RelativeTimeFormat Instances"><span class="secnum">17.4</span> Properties of Intl.RelativeTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat--abstracts" title="Abstract Operations for RelativeTimeFormat Objects"><span class="secnum">17.5</span> Abstract Operations for RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-singularrelativetimeunit" title="SingularRelativeTimeUnit ( unit )"><span class="secnum">17.5.1</span> SingularRelativeTimeUnit ( <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-PartitionRelativeTimePattern" title="PartitionRelativeTimePattern ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.2</span> PartitionRelativeTimePattern ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makepartslist" title="MakePartsList ( pattern, unit, parts )"><span class="secnum">17.5.3</span> MakePartsList ( <var>pattern</var>, <var>unit</var>, <var>parts</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTime" title="FormatRelativeTime ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.4</span> FormatRelativeTime ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTimeToParts" title="FormatRelativeTimeToParts ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.5</span> FormatRelativeTimeToParts ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#segmenter-objects" title="Segmenter Objects"><span class="secnum">18</span> Segmenter Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-constructor" title="The Intl.Segmenter Constructor"><span class="secnum">18.1</span> The Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter" title="Intl.Segmenter ( [ locales [ , options ] ] )"><span class="secnum">18.1.1</span> Intl.Segmenter ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-constructor" title="Properties of the Intl.Segmenter Constructor"><span class="secnum">18.2</span> Properties of the Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype" title="Intl.Segmenter.prototype"><span class="secnum">18.2.1</span> Intl.Segmenter.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.supportedlocalesof" title="Intl.Segmenter.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">18.2.2</span> Intl.Segmenter.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-internal-slots" title="Internal slots"><span class="secnum">18.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-prototype-object" title="Properties of the Intl.Segmenter Prototype Object"><span class="secnum">18.3</span> Properties of the Intl.Segmenter Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.constructor" title="Intl.Segmenter.prototype.constructor"><span class="secnum">18.3.1</span> Intl.Segmenter.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype-%symbol.tostringtag%" title="Intl.Segmenter.prototype [ %Symbol.toStringTag% ]"><span class="secnum">18.3.2</span> Intl.Segmenter.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.segment" title="Intl.Segmenter.prototype.segment ( string )"><span class="secnum">18.3.3</span> Intl.Segmenter.prototype.segment ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.resolvedoptions" title="Intl.Segmenter.prototype.resolvedOptions ( )"><span class="secnum">18.3.4</span> Intl.Segmenter.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-segmenter-instances" title="Properties of Intl.Segmenter Instances"><span class="secnum">18.4</span> Properties of Intl.Segmenter Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-segments-objects" title="Segments Objects"><span class="secnum">18.5</span> Segments Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentsobject" title="CreateSegmentsObject ( segmenter, string )"><span class="secnum">18.5.1</span> CreateSegmentsObject ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentsprototype%-object" title="The %IntlSegmentsPrototype% Object"><span class="secnum">18.5.2</span> The %IntlSegmentsPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%.containing" title="%IntlSegmentsPrototype%.containing ( index )"><span class="secnum">18.5.2.1</span> %IntlSegmentsPrototype%.containing ( <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%-%symbol.iterator%" title="%IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )"><span class="secnum">18.5.2.2</span> %IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segments-instances" title="Properties of Segments Instances"><span class="secnum">18.5.3</span> Properties of Segments Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-iterator-objects" title="Segment Iterator Objects"><span class="secnum">18.6</span> Segment Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentiterator" title="CreateSegmentIterator ( segmenter, string )"><span class="secnum">18.6.1</span> CreateSegmentIterator ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentiteratorprototype%-object" title="The %IntlSegmentIteratorPrototype% Object"><span class="secnum">18.6.2</span> The %IntlSegmentIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.next" title="%IntlSegmentIteratorPrototype%.next ( )"><span class="secnum">18.6.2.1</span> %IntlSegmentIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.%symbol.tostringtag%" title="%IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">18.6.2.2</span> %IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segment-iterator-instances" title="Properties of Segment Iterator Instances"><span class="secnum">18.6.3</span> Properties of Segment Iterator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-data-objects" title="Segment Data Objects"><span class="secnum">18.7</span> Segment Data Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentdataobject" title="CreateSegmentDataObject ( segmenter, string, startIndex, endIndex )"><span class="secnum">18.7.1</span> CreateSegmentDataObject ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>endIndex</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-abstracts" title="Abstract Operations for Segmenter Objects"><span class="secnum">18.8</span> Abstract Operations for Segmenter Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-findboundary" title="FindBoundary ( segmenter, string, startIndex, direction )"><span class="secnum">18.8.1</span> FindBoundary ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>direction</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-sensitive-functions" title="Locale Sensitive Functions of the ECMAScript Language Specification"><span class="secnum">19</span> Locale Sensitive Functions of the ECMAScript Language Specification</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-string-prototype-object" title="Properties of the String Prototype Object"><span class="secnum">19.1</span> Properties of the String Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-String.prototype.localeCompare" title="String.prototype.localeCompare ( that [ , locales [ , options ] ] )"><span class="secnum">19.1.1</span> String.prototype.localeCompare ( <var>that</var> [ , <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle">+</span><a href="#sup-string.prototype.tolocalelowercase" title="String.prototype.toLocaleLowerCase ( [ locales ] )"><span class="secnum">19.1.2</span> String.prototype.toLocaleLowerCase ( [ <var>locales</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-transform-case" title="TransformCase ( S, locales, targetCase )"><span class="secnum">19.1.2.1</span> TransformCase ( <var>S</var>, <var>locales</var>, <var>targetCase</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sup-string.prototype.tolocaleuppercase" title="String.prototype.toLocaleUpperCase ( [ locales ] )"><span class="secnum">19.1.3</span> String.prototype.toLocaleUpperCase ( [ <var>locales</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-number-prototype-object" title="Properties of the Number Prototype Object"><span class="secnum">19.2</span> Properties of the Number Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-number.prototype.tolocalestring" title="Number.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.2.1</span> Number.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-bigint-prototype-object" title="Properties of the BigInt Prototype Object"><span class="secnum">19.3</span> Properties of the BigInt Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-bigint.prototype.tolocalestring" title="BigInt.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.3.1</span> BigInt.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-date-prototype-object" title="Properties of the Date Prototype Object"><span class="secnum">19.4</span> Properties of the Date Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocalestring" title="Date.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.4.1</span> Date.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaledatestring" title="Date.prototype.toLocaleDateString ( [ locales [ , options ] ] )"><span class="secnum">19.4.2</span> Date.prototype.toLocaleDateString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaletimestring" title="Date.prototype.toLocaleTimeString ( [ locales [ , options ] ] )"><span class="secnum">19.4.3</span> Date.prototype.toLocaleTimeString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-array-prototype-object" title="Properties of the Array Prototype Object"><span class="secnum">19.5</span> Properties of the Array Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-array.prototype.tolocalestring" title="Array.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.5.1</span> Array.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#annex-implementation-dependent-behaviour" title="Implementation Dependent Behaviour"><span class="secnum">A</span> Implementation Dependent Behaviour</a></li><li><span class="item-toggle-none"></span><a href="#annex-incompatibilities" title="Additions and Changes That Introduce Incompatibilities with Prior Editions"><span class="secnum">B</span> Additions and Changes That Introduce Incompatibilities with Prior Editions</a></li><li><span class="item-toggle-none"></span><a href="#sec-colophon" title="Colophon"><span class="secnum">C</span> Colophon</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">D</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Draft ECMA-402 / October 25, 2024</h1><h1 class="title">ECMAScript® 2024 Internationalization API Specification</h1>
+    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#introduction" title="Introduction">Introduction</a></li><li><span class="item-toggle-none"></span><a href="#scope" title="Scope"><span class="secnum">1</span> Scope</a></li><li><span class="item-toggle-none"></span><a href="#conformance" title="Conformance"><span class="secnum">2</span> Conformance</a></li><li><span class="item-toggle-none"></span><a href="#normative-references" title="Normative References"><span class="secnum">3</span> Normative References</a></li><li><span class="item-toggle">+</span><a href="#overview" title="Overview"><span class="secnum">4</span> Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internationalization-localization-globalization" title="Internationalization, Localization, and Globalization"><span class="secnum">4.1</span> Internationalization, Localization, and Globalization</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-overview" title="API Overview"><span class="secnum">4.2</span> API Overview</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-conventions" title="API Conventions"><span class="secnum">4.3</span> API Conventions</a></li><li><span class="item-toggle">+</span><a href="#sec-implementation-dependencies" title="Implementation Dependencies"><span class="secnum">4.4</span> Implementation Dependencies</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-compatibility" title="Compatibility across implementations"><span class="secnum">4.4.1</span> Compatibility across implementations</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#conventions" title="Notational Conventions"><span class="secnum">5</span> Notational Conventions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-402-well-known-intrinsic-objects" title="Well-Known Intrinsic Objects"><span class="secnum">5.1</span> Well-Known Intrinsic Objects</a></li></ol></li><li><span class="item-toggle">+</span><a href="#locales-currencies-tz" title="Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars"><span class="secnum">6</span> Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-case-sensitivity-and-case-mapping" title="Case Sensitivity and Case Mapping"><span class="secnum">6.1</span> Case Sensitivity and Case Mapping</a></li><li><span class="item-toggle">+</span><a href="#sec-language-tags" title="Language Tags"><span class="secnum">6.2</span> Language Tags</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-isstructurallyvalidlanguagetag" title="IsStructurallyValidLanguageTag ( locale )"><span class="secnum">6.2.1</span> IsStructurallyValidLanguageTag ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeunicodelocaleid" title="CanonicalizeUnicodeLocaleId ( locale )"><span class="secnum">6.2.2</span> CanonicalizeUnicodeLocaleId ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultlocale" title="DefaultLocale ( )"><span class="secnum">6.2.3</span> DefaultLocale ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-currency-codes" title="Currency Codes"><span class="secnum">6.3</span> Currency Codes</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedcurrencycode" title="IsWellFormedCurrencyCode ( currency )"><span class="secnum">6.3.1</span> IsWellFormedCurrencyCode ( <var>currency</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcurrencies" title="AvailableCanonicalCurrencies ( )"><span class="secnum">6.4</span> AvailableCanonicalCurrencies ( )</a></li><li><span class="item-toggle">+</span><a href="#sec-use-of-iana-time-zone-database" title="Use of the IANA Time Zone Database"><span class="secnum">6.5</span> Use of the IANA Time Zone Database</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-availablenamedtimezoneidentifiers" title="AvailableNamedTimeZoneIdentifiers ( )"><span class="secnum">6.5.1</span> AvailableNamedTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getavailablenamedtimezoneidentifier" title="GetAvailableNamedTimeZoneIdentifier ( timeZoneIdentifier )"><span class="secnum">6.5.2</span> GetAvailableNamedTimeZoneIdentifier ( <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availableprimarytimezoneidentifiers" title="AvailablePrimaryTimeZoneIdentifiers ( )"><span class="secnum">6.5.3</span> AvailablePrimaryTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-string-split-to-list" title="StringSplitToList ( S, separator )"><span class="secnum">6.5.4</span> StringSplitToList ( <var>S</var>, <var>separator</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-measurement-unit-identifiers" title="Measurement Unit Identifiers"><span class="secnum">6.6</span> Measurement Unit Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedunitidentifier" title="IsWellFormedUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.1</span> IsWellFormedUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-issanctionedsingleunitidentifier" title="IsSanctionedSingleUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.2</span> IsSanctionedSingleUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalunits" title="AvailableCanonicalUnits ( )"><span class="secnum">6.6.3</span> AvailableCanonicalUnits ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numberingsystem-identifiers" title="Numbering System Identifiers"><span class="secnum">6.7</span> Numbering System Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalnumberingsystems" title="AvailableCanonicalNumberingSystems ( )"><span class="secnum">6.7.1</span> AvailableCanonicalNumberingSystems ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-collation-types" title="Collation Types"><span class="secnum">6.8</span> Collation Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcollations" title="AvailableCanonicalCollations ( )"><span class="secnum">6.8.1</span> AvailableCanonicalCollations ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-calendar-types" title="Calendar Types"><span class="secnum">6.9</span> Calendar Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecalendars" title="AvailableCalendars ( )"><span class="secnum">6.9.1</span> AvailableCalendars ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-pattern-string-types" title="Pattern String Types"><span class="secnum">6.10</span> Pattern String Types</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#requirements" title="Requirements for Standard Built-in ECMAScript Objects"><span class="secnum">7</span> Requirements for Standard Built-in ECMAScript Objects</a></li><li><span class="item-toggle">+</span><a href="#intl-object" title="The Intl Object"><span class="secnum">8</span> The Intl Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-value-properties-of-the-intl-object" title="Value Properties of the Intl Object"><span class="secnum">8.1</span> Value Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl-%symbol.tostringtag%" title="Intl [ %Symbol.toStringTag% ]"><span class="secnum">8.1.1</span> Intl [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-constructor-properties-of-the-intl-object" title="Constructor Properties of the Intl Object"><span class="secnum">8.2</span> Constructor Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator-intro" title="Intl.Collator ( . . . )"><span class="secnum">8.2.1</span> Intl.Collator ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat-intro" title="Intl.DateTimeFormat ( . . . )"><span class="secnum">8.2.2</span> Intl.DateTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames-intro" title="Intl.DisplayNames ( . . . )"><span class="secnum">8.2.3</span> Intl.DisplayNames ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.listformat-intro" title="Intl.ListFormat ( . . . )"><span class="secnum">8.2.4</span> Intl.ListFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-intro" title="Intl.Locale ( . . . )"><span class="secnum">8.2.5</span> Intl.Locale ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-intro" title="Intl.NumberFormat ( . . . )"><span class="secnum">8.2.6</span> Intl.NumberFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-intro" title="Intl.PluralRules ( . . . )"><span class="secnum">8.2.7</span> Intl.PluralRules ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat-intro" title="Intl.RelativeTimeFormat ( . . . )"><span class="secnum">8.2.8</span> Intl.RelativeTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-intro" title="Intl.Segmenter ( . . . )"><span class="secnum">8.2.9</span> Intl.Segmenter ( . . . )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-properties-of-the-intl-object" title="Function Properties of the Intl Object"><span class="secnum">8.3</span> Function Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.getcanonicallocales" title="Intl.getCanonicalLocales ( locales )"><span class="secnum">8.3.1</span> Intl.getCanonicalLocales ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.supportedvaluesof" title="Intl.supportedValuesOf ( key )"><span class="secnum">8.3.2</span> Intl.supportedValuesOf ( <var>key</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-and-parameter-negotiation" title="Locale and Parameter Negotiation"><span class="secnum">9</span> Locale and Parameter Negotiation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internal-slots" title="Internal slots of Service Constructors"><span class="secnum">9.1</span> Internal slots of Service Constructors</a></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">9.2</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalizelocalelist" title="CanonicalizeLocaleList ( locales )"><span class="secnum">9.2.1</span> CanonicalizeLocaleList ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeuvalue" title="CanonicalizeUValue ( ukey, uvalue )"><span class="secnum">9.2.2</span> CanonicalizeUValue ( <var>ukey</var>, <var>uvalue</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebyprefix" title="LookupMatchingLocaleByPrefix ( availableLocales, requestedLocales )"><span class="secnum">9.2.3</span> LookupMatchingLocaleByPrefix ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebybestfit" title="LookupMatchingLocaleByBestFit ( availableLocales, requestedLocales )"><span class="secnum">9.2.4</span> LookupMatchingLocaleByBestFit ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unicode-extension-components" title="UnicodeExtensionComponents ( extension )"><span class="secnum">9.2.5</span> UnicodeExtensionComponents ( <var>extension</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-insert-unicode-extension-and-canonicalize" title="InsertUnicodeExtensionAndCanonicalize ( locale, attributes, keywords )"><span class="secnum">9.2.6</span> InsertUnicodeExtensionAndCanonicalize ( <var>locale</var>, <var>attributes</var>, <var>keywords</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvelocale" title="ResolveLocale ( availableLocales, requestedLocales, options, relevantExtensionKeys, localeData )"><span class="secnum">9.2.7</span> ResolveLocale ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var>, <var>relevantExtensionKeys</var>, <var>localeData</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-filterlocales" title="FilterLocales ( availableLocales, requestedLocales, options )"><span class="secnum">9.2.8</span> FilterLocales ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoptionsobject" title="GetOptionsObject ( options )"><span class="secnum">9.2.9</span> GetOptionsObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-coerceoptionstoobject" title="CoerceOptionsToObject ( options )"><span class="secnum">9.2.10</span> CoerceOptionsToObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoption" title="GetOption ( options, property, type, values, default )"><span class="secnum">9.2.11</span> GetOption ( <var>options</var>, <var>property</var>, <var>type</var>, <var>values</var>, <var>default</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getbooleanorstringnumberformatoption" title="GetBooleanOrStringNumberFormatOption ( options, property, stringValues, fallback )"><span class="secnum">9.2.12</span> GetBooleanOrStringNumberFormatOption ( <var>options</var>, <var>property</var>, <var>stringValues</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultnumberoption" title="DefaultNumberOption ( value, minimum, maximum, fallback )"><span class="secnum">9.2.13</span> DefaultNumberOption ( <var>value</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberoption" title="GetNumberOption ( options, property, minimum, maximum, fallback )"><span class="secnum">9.2.14</span> GetNumberOption ( <var>options</var>, <var>property</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionpattern" title="PartitionPattern ( pattern )"><span class="secnum">9.2.15</span> PartitionPattern ( <var>pattern</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#collator-objects" title="Collator Objects"><span class="secnum">10</span> Collator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-the-intl-collator-constructor" title="The Intl.Collator Constructor"><span class="secnum">10.1</span> The Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator" title="Intl.Collator ( [ locales [ , options ] ] )"><span class="secnum">10.1.1</span> Intl.Collator ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-constructor" title="Properties of the Intl.Collator Constructor"><span class="secnum">10.2</span> Properties of the Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype" title="Intl.Collator.prototype"><span class="secnum">10.2.1</span> Intl.Collator.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.supportedlocalesof" title="Intl.Collator.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">10.2.2</span> Intl.Collator.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl-collator-internal-slots" title="Internal slots"><span class="secnum">10.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-prototype-object" title="Properties of the Intl.Collator Prototype Object"><span class="secnum">10.3</span> Properties of the Intl.Collator Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.constructor" title="Intl.Collator.prototype.constructor"><span class="secnum">10.3.1</span> Intl.Collator.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype-%symbol.tostringtag%" title="Intl.Collator.prototype [ %Symbol.toStringTag% ]"><span class="secnum">10.3.2</span> Intl.Collator.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.collator.prototype.compare" title="get Intl.Collator.prototype.compare"><span class="secnum">10.3.3</span> get Intl.Collator.prototype.compare</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-collator-compare-functions" title="Collator Compare Functions"><span class="secnum">10.3.3.1</span> Collator Compare Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-collator-comparestrings" title="CompareStrings ( collator, x, y )"><span class="secnum">10.3.3.2</span> CompareStrings ( <var>collator</var>, <var>x</var>, <var>y</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.resolvedoptions" title="Intl.Collator.prototype.resolvedOptions ( )"><span class="secnum">10.3.4</span> Intl.Collator.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-collator-instances" title="Properties of Intl.Collator Instances"><span class="secnum">10.4</span> Properties of Intl.Collator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#datetimeformat-objects" title="DateTimeFormat Objects"><span class="secnum">11</span> DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-datetimeformat-constructor" title="The Intl.DateTimeFormat Constructor"><span class="secnum">11.1</span> The Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat" title="Intl.DateTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">11.1.1</span> Intl.DateTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chaindatetimeformat" title="ChainDateTimeFormat ( dateTimeFormat, newTarget, this )"><span class="secnum">11.1.1.1</span> ChainDateTimeFormat ( <var>dateTimeFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-createdatetimeformat" title="CreateDateTimeFormat ( newTarget, locales, options, required, defaults )"><span class="secnum">11.1.2</span> CreateDateTimeFormat ( <var>newTarget</var>, <var>locales</var>, <var>options</var>, <var>required</var>, <var>defaults</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatoffsettimezoneidentifier" title="FormatOffsetTimeZoneIdentifier ( offsetMinutes )"><span class="secnum">11.1.3</span> FormatOffsetTimeZoneIdentifier ( <var>offsetMinutes</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-constructor" title="Properties of the Intl.DateTimeFormat Constructor"><span class="secnum">11.2</span> Properties of the Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype" title="Intl.DateTimeFormat.prototype"><span class="secnum">11.2.1</span> Intl.DateTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.supportedlocalesof" title="Intl.DateTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">11.2.2</span> Intl.DateTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat-internal-slots" title="Internal slots"><span class="secnum">11.2.3</span> Internal slots</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-format-record" title="DateTime Format Records"><span class="secnum">11.2.3.1</span> DateTime Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-record" title="DateTime Range Pattern Records"><span class="secnum">11.2.3.2</span> DateTime Range Pattern Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-format-record" title="DateTime Range Pattern Format Records"><span class="secnum">11.2.3.3</span> DateTime Range Pattern Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-part-record" title="DateTime Range Pattern Part Records"><span class="secnum">11.2.3.4</span> DateTime Range Pattern Part Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-styles-record" title="DateTime Styles Records"><span class="secnum">11.2.3.5</span> DateTime Styles Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-record" title="DateTime Style Records"><span class="secnum">11.2.3.6</span> DateTime Style Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-connector-record" title="DateTime Connector Records"><span class="secnum">11.2.3.7</span> DateTime Connector Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-date-range-record" title="DateTime Date Range Records"><span class="secnum">11.2.3.8</span> DateTime Date Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-time-range-record" title="DateTime Time Range Records"><span class="secnum">11.2.3.9</span> DateTime Time Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-range-record" title="DateTime Style Range Records"><span class="secnum">11.2.3.10</span> DateTime Style Range Records</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-prototype-object" title="Properties of the Intl.DateTimeFormat Prototype Object"><span class="secnum">11.3</span> Properties of the Intl.DateTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.constructor" title="Intl.DateTimeFormat.prototype.constructor"><span class="secnum">11.3.1</span> Intl.DateTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype-%symbol.tostringtag%" title="Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">11.3.2</span> Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.format" title="get Intl.DateTimeFormat.prototype.format"><span class="secnum">11.3.3</span> get Intl.DateTimeFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatToParts" title="Intl.DateTimeFormat.prototype.formatToParts ( date )"><span class="secnum">11.3.4</span> Intl.DateTimeFormat.prototype.formatToParts ( <var>date</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.formatRange" title="Intl.DateTimeFormat.prototype.formatRange ( startDate, endDate )"><span class="secnum">11.3.5</span> Intl.DateTimeFormat.prototype.formatRange ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatRangeToParts" title="Intl.DateTimeFormat.prototype.formatRangeToParts ( startDate, endDate )"><span class="secnum">11.3.6</span> Intl.DateTimeFormat.prototype.formatRangeToParts ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.resolvedoptions" title="Intl.DateTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">11.3.7</span> Intl.DateTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-datetimeformat-instances" title="Properties of Intl.DateTimeFormat Instances"><span class="secnum">11.4</span> Properties of Intl.DateTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-datetimeformat-abstracts" title="Abstract Operations for DateTimeFormat Objects"><span class="secnum">11.5</span> Abstract Operations for DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-time-style-format" title="DateTimeStyleFormat ( dateStyle, timeStyle, styles )"><span class="secnum">11.5.1</span> DateTimeStyleFormat ( <var>dateStyle</var>, <var>timeStyle</var>, <var>styles</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-basicformatmatcher" title="BasicFormatMatcher ( options, formats )"><span class="secnum">11.5.2</span> BasicFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-bestfitformatmatcher" title="BestFitFormatMatcher ( options, formats )"><span class="secnum">11.5.3</span> BestFitFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetime-format-functions" title="DateTime Format Functions"><span class="secnum">11.5.4</span> DateTime Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimepattern" title="FormatDateTimePattern ( dateTimeFormat, format, pattern, epochNanoseconds )"><span class="secnum">11.5.5</span> FormatDateTimePattern ( <var>dateTimeFormat</var>, <var>format</var>, <var>pattern</var>, <var>epochNanoseconds</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimepattern" title="PartitionDateTimePattern ( dateTimeFormat, x )"><span class="secnum">11.5.6</span> PartitionDateTimePattern ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetime" title="FormatDateTime ( dateTimeFormat, x )"><span class="secnum">11.5.7</span> FormatDateTime ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimetoparts" title="FormatDateTimeToParts ( dateTimeFormat, x )"><span class="secnum">11.5.8</span> FormatDateTimeToParts ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimerangepattern" title="PartitionDateTimeRangePattern ( dateTimeFormat, x, y )"><span class="secnum">11.5.9</span> PartitionDateTimeRangePattern ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerange" title="FormatDateTimeRange ( dateTimeFormat, x, y )"><span class="secnum">11.5.10</span> FormatDateTimeRange ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerangetoparts" title="FormatDateTimeRangeToParts ( dateTimeFormat, x, y )"><span class="secnum">11.5.11</span> FormatDateTimeRangeToParts ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-tolocaltime" title="ToLocalTime ( epochNs, calendar, timeZoneIdentifier )"><span class="secnum">11.5.12</span> ToLocalTime ( <var>epochNs</var>, <var>calendar</var>, <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-tolocaltime-records" title="ToLocalTime Records"><span class="secnum">11.5.13</span> ToLocalTime Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapdatetimeformat" title="UnwrapDateTimeFormat ( dtf )"><span class="secnum">11.5.14</span> UnwrapDateTimeFormat ( <var>dtf</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#intl-displaynames-objects" title="DisplayNames Objects"><span class="secnum">12</span> DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-constructor" title="The Intl.DisplayNames Constructor"><span class="secnum">12.1</span> The Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames" title="Intl.DisplayNames ( locales, options )"><span class="secnum">12.1.1</span> Intl.DisplayNames ( <var>locales</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-constructor" title="Properties of the Intl.DisplayNames Constructor"><span class="secnum">12.2</span> Properties of the Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype" title="Intl.DisplayNames.prototype"><span class="secnum">12.2.1</span> Intl.DisplayNames.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.supportedLocalesOf" title="Intl.DisplayNames.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">12.2.2</span> Intl.DisplayNames.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames-internal-slots" title="Internal slots"><span class="secnum">12.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-prototype-object" title="Properties of the Intl.DisplayNames Prototype Object"><span class="secnum">12.3</span> Properties of the Intl.DisplayNames Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.constructor" title="Intl.DisplayNames.prototype.constructor"><span class="secnum">12.3.1</span> Intl.DisplayNames.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames.prototype-%symbol.tostringtag%" title="Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]"><span class="secnum">12.3.2</span> Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.of" title="Intl.DisplayNames.prototype.of ( code )"><span class="secnum">12.3.3</span> Intl.DisplayNames.prototype.of ( <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.resolvedOptions" title="Intl.DisplayNames.prototype.resolvedOptions ( )"><span class="secnum">12.3.4</span> Intl.DisplayNames.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-displaynames-instances" title="Properties of Intl.DisplayNames Instances"><span class="secnum">12.4</span> Properties of Intl.DisplayNames Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-abstracts" title="Abstract Operations for DisplayNames Objects"><span class="secnum">12.5</span> Abstract Operations for DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalcodefordisplaynames" title="CanonicalCodeForDisplayNames ( type, code )"><span class="secnum">12.5.1</span> CanonicalCodeForDisplayNames ( <var>type</var>, <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvaliddatetimefieldcode" title="IsValidDateTimeFieldCode ( field )"><span class="secnum">12.5.2</span> IsValidDateTimeFieldCode ( <var>field</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#listformat-objects" title="ListFormat Objects"><span class="secnum">13</span> ListFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-constructor" title="The Intl.ListFormat Constructor"><span class="secnum">13.1</span> The Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat" title="Intl.ListFormat ( [ locales [ , options ] ] )"><span class="secnum">13.1.1</span> Intl.ListFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-constructor" title="Properties of the Intl.ListFormat Constructor"><span class="secnum">13.2</span> Properties of the Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype" title="Intl.ListFormat.prototype"><span class="secnum">13.2.1</span> Intl.ListFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.supportedLocalesOf" title="Intl.ListFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">13.2.2</span> Intl.ListFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat-internal-slots" title="Internal slots"><span class="secnum">13.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-prototype-object" title="Properties of the Intl.ListFormat Prototype Object"><span class="secnum">13.3</span> Properties of the Intl.ListFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.constructor" title="Intl.ListFormat.prototype.constructor"><span class="secnum">13.3.1</span> Intl.ListFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype-toStringTag" title="Intl.ListFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">13.3.2</span> Intl.ListFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.format" title="Intl.ListFormat.prototype.format ( list )"><span class="secnum">13.3.3</span> Intl.ListFormat.prototype.format ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.formatToParts" title="Intl.ListFormat.prototype.formatToParts ( list )"><span class="secnum">13.3.4</span> Intl.ListFormat.prototype.formatToParts ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.resolvedoptions" title="Intl.ListFormat.prototype.resolvedOptions ( )"><span class="secnum">13.3.5</span> Intl.ListFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-listformat-instances" title="Properties of Intl.ListFormat Instances"><span class="secnum">13.4</span> Properties of Intl.ListFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-abstracts" title="Abstract Operations for ListFormat Objects"><span class="secnum">13.5</span> Abstract Operations for ListFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-deconstructpattern" title="DeconstructPattern ( pattern, placeables )"><span class="secnum">13.5.1</span> DeconstructPattern ( <var>pattern</var>, <var>placeables</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createpartsfromlist" title="CreatePartsFromList ( listFormat, list )"><span class="secnum">13.5.2</span> CreatePartsFromList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlist" title="FormatList ( listFormat, list )"><span class="secnum">13.5.3</span> FormatList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlisttoparts" title="FormatListToParts ( listFormat, list )"><span class="secnum">13.5.4</span> FormatListToParts ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createstringlistfromiterable" title="StringListFromIterable ( iterable )"><span class="secnum">13.5.5</span> StringListFromIterable ( <var>iterable</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-objects" title="Locale Objects"><span class="secnum">14</span> Locale Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-locale-constructor" title="The Intl.Locale Constructor"><span class="secnum">14.1</span> The Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale" title="Intl.Locale ( tag [ , options ] )"><span class="secnum">14.1.1</span> Intl.Locale ( <var>tag</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-updatelanguageid" title="UpdateLanguageId ( tag, options )"><span class="secnum">14.1.2</span> UpdateLanguageId ( <var>tag</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makelocalerecord" title="MakeLocaleRecord ( tag, options, localeExtensionKeys )"><span class="secnum">14.1.3</span> MakeLocaleRecord ( <var>tag</var>, <var>options</var>, <var>localeExtensionKeys</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-constructor" title="Properties of the Intl.Locale Constructor"><span class="secnum">14.2</span> Properties of the Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype" title="Intl.Locale.prototype"><span class="secnum">14.2.1</span> Intl.Locale.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-internal-slots" title="Internal slots"><span class="secnum">14.2.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-prototype-object" title="Properties of the Intl.Locale Prototype Object"><span class="secnum">14.3</span> Properties of the Intl.Locale Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.constructor" title="Intl.Locale.prototype.constructor"><span class="secnum">14.3.1</span> Intl.Locale.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale.prototype-%symbol.tostringtag%" title="Intl.Locale.prototype [ %Symbol.toStringTag% ]"><span class="secnum">14.3.2</span> Intl.Locale.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.maximize" title="Intl.Locale.prototype.maximize ( )"><span class="secnum">14.3.3</span> Intl.Locale.prototype.maximize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.minimize" title="Intl.Locale.prototype.minimize ( )"><span class="secnum">14.3.4</span> Intl.Locale.prototype.minimize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.toString" title="Intl.Locale.prototype.toString ( )"><span class="secnum">14.3.5</span> Intl.Locale.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.baseName" title="get Intl.Locale.prototype.baseName"><span class="secnum">14.3.6</span> get Intl.Locale.prototype.baseName</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.calendar" title="get Intl.Locale.prototype.calendar"><span class="secnum">14.3.7</span> get Intl.Locale.prototype.calendar</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.caseFirst" title="get Intl.Locale.prototype.caseFirst"><span class="secnum">14.3.8</span> get Intl.Locale.prototype.caseFirst</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.collation" title="get Intl.Locale.prototype.collation"><span class="secnum">14.3.9</span> get Intl.Locale.prototype.collation</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.hourCycle" title="get Intl.Locale.prototype.hourCycle"><span class="secnum">14.3.10</span> get Intl.Locale.prototype.hourCycle</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numeric" title="get Intl.Locale.prototype.numeric"><span class="secnum">14.3.11</span> get Intl.Locale.prototype.numeric</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numberingSystem" title="get Intl.Locale.prototype.numberingSystem"><span class="secnum">14.3.12</span> get Intl.Locale.prototype.numberingSystem</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.language" title="get Intl.Locale.prototype.language"><span class="secnum">14.3.13</span> get Intl.Locale.prototype.language</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.script" title="get Intl.Locale.prototype.script"><span class="secnum">14.3.14</span> get Intl.Locale.prototype.script</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.region" title="get Intl.Locale.prototype.region"><span class="secnum">14.3.15</span> get Intl.Locale.prototype.region</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-locale-instances" title="Properties of Intl.Locale Instances"><span class="secnum">14.4</span> Properties of Intl.Locale Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-locale-abstracts" title="Abstract Operations for Locale Objects"><span class="secnum">14.5</span> Abstract Operations for Locale Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getlocalebasename" title="GetLocaleBaseName ( locale )"><span class="secnum">14.5.1</span> GetLocaleBaseName ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalelanguage" title="GetLocaleLanguage ( locale )"><span class="secnum">14.5.2</span> GetLocaleLanguage ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalescript" title="GetLocaleScript ( locale )"><span class="secnum">14.5.3</span> GetLocaleScript ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocaleregion" title="GetLocaleRegion ( locale )"><span class="secnum">14.5.4</span> GetLocaleRegion ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalevariants" title="GetLocaleVariants ( locale )"><span class="secnum">14.5.5</span> GetLocaleVariants ( <var>locale</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#numberformat-objects" title="NumberFormat Objects"><span class="secnum">15</span> NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-numberformat-constructor" title="The Intl.NumberFormat Constructor"><span class="secnum">15.1</span> The Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.numberformat" title="Intl.NumberFormat ( [ locales [ , options ] ] )"><span class="secnum">15.1.1</span> Intl.NumberFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chainnumberformat" title="ChainNumberFormat ( numberFormat, newTarget, this )"><span class="secnum">15.1.1.1</span> ChainNumberFormat ( <var>numberFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-setnfdigitoptions" title="SetNumberFormatDigitOptions ( intlObj, options, mnfdDefault, mxfdDefault, notation )"><span class="secnum">15.1.2</span> SetNumberFormatDigitOptions ( <var>intlObj</var>, <var>options</var>, <var>mnfdDefault</var>, <var>mxfdDefault</var>, <var>notation</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-setnumberformatunitoptions" title="SetNumberFormatUnitOptions ( intlObj, options )"><span class="secnum">15.1.3</span> SetNumberFormatUnitOptions ( <var>intlObj</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-constructor" title="Properties of the Intl.NumberFormat Constructor"><span class="secnum">15.2</span> Properties of the Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype" title="Intl.NumberFormat.prototype"><span class="secnum">15.2.1</span> Intl.NumberFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.supportedlocalesof" title="Intl.NumberFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">15.2.2</span> Intl.NumberFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-internal-slots" title="Internal slots"><span class="secnum">15.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-prototype-object" title="Properties of the Intl.NumberFormat Prototype Object"><span class="secnum">15.3</span> Properties of the Intl.NumberFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.constructor" title="Intl.NumberFormat.prototype.constructor"><span class="secnum">15.3.1</span> Intl.NumberFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype-%symbol.tostringtag%" title="Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">15.3.2</span> Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.format" title="get Intl.NumberFormat.prototype.format"><span class="secnum">15.3.3</span> get Intl.NumberFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formattoparts" title="Intl.NumberFormat.prototype.formatToParts ( value )"><span class="secnum">15.3.4</span> Intl.NumberFormat.prototype.formatToParts ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrange" title="Intl.NumberFormat.prototype.formatRange ( start, end )"><span class="secnum">15.3.5</span> Intl.NumberFormat.prototype.formatRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrangetoparts" title="Intl.NumberFormat.prototype.formatRangeToParts ( start, end )"><span class="secnum">15.3.6</span> Intl.NumberFormat.prototype.formatRangeToParts ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.resolvedoptions" title="Intl.NumberFormat.prototype.resolvedOptions ( )"><span class="secnum">15.3.7</span> Intl.NumberFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-numberformat-instances" title="Properties of Intl.NumberFormat Instances"><span class="secnum">15.4</span> Properties of Intl.NumberFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-numberformat-abstracts" title="Abstract Operations for NumberFormat Objects"><span class="secnum">15.5</span> Abstract Operations for NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-currencydigits" title="CurrencyDigits ( currency )"><span class="secnum">15.5.1</span> CurrencyDigits ( <var>currency</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-number-format-functions" title="Number Format Functions"><span class="secnum">15.5.2</span> Number Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumberstring" title="FormatNumericToString ( intlObject, x )"><span class="secnum">15.5.3</span> FormatNumericToString ( <var>intlObject</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberpattern" title="PartitionNumberPattern ( numberFormat, x )"><span class="secnum">15.5.4</span> PartitionNumberPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnotationsubpattern" title="PartitionNotationSubPattern ( numberFormat, x, n, exponent )"><span class="secnum">15.5.5</span> PartitionNotationSubPattern ( <var>numberFormat</var>, <var>x</var>, <var>n</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumber" title="FormatNumeric ( numberFormat, x )"><span class="secnum">15.5.6</span> FormatNumeric ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumbertoparts" title="FormatNumericToParts ( numberFormat, x )"><span class="secnum">15.5.7</span> FormatNumericToParts ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawprecision" title="ToRawPrecision ( x, minPrecision, maxPrecision, unsignedRoundingMode )"><span class="secnum">15.5.8</span> ToRawPrecision ( <var>x</var>, <var>minPrecision</var>, <var>maxPrecision</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawfixed" title="ToRawFixed ( x, minFraction, maxFraction, roundingIncrement, unsignedRoundingMode )"><span class="secnum">15.5.9</span> ToRawFixed ( <var>x</var>, <var>minFraction</var>, <var>maxFraction</var>, <var>roundingIncrement</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapnumberformat" title="UnwrapNumberFormat ( nf )"><span class="secnum">15.5.10</span> UnwrapNumberFormat ( <var>nf</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberformatpattern" title="GetNumberFormatPattern ( numberFormat, x )"><span class="secnum">15.5.11</span> GetNumberFormatPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnotationsubpattern" title="GetNotationSubPattern ( numberFormat, exponent )"><span class="secnum">15.5.12</span> GetNotationSubPattern ( <var>numberFormat</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponent" title="ComputeExponent ( numberFormat, x )"><span class="secnum">15.5.13</span> ComputeExponent ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponentformagnitude" title="ComputeExponentForMagnitude ( numberFormat, magnitude )"><span class="secnum">15.5.14</span> ComputeExponentForMagnitude ( <var>numberFormat</var>, <var>magnitude</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-stringintlmv" title="Runtime Semantics: StringIntlMV"><span class="secnum">15.5.15</span> RS: StringIntlMV</a></li><li><span class="item-toggle-none"></span><a href="#sec-tointlmathematicalvalue" title="ToIntlMathematicalValue ( value )"><span class="secnum">15.5.16</span> ToIntlMathematicalValue ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getunsignedroundingmode" title="GetUnsignedRoundingMode ( roundingMode, sign )"><span class="secnum">15.5.17</span> GetUnsignedRoundingMode ( <var>roundingMode</var>, <var>sign</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-applyunsignedroundingmode" title="ApplyUnsignedRoundingMode ( x, r1, r2, unsignedRoundingMode )"><span class="secnum">15.5.18</span> ApplyUnsignedRoundingMode ( <var>x</var>, <var>r1</var>, <var>r2</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberrangepattern" title="PartitionNumberRangePattern ( numberFormat, x, y )"><span class="secnum">15.5.19</span> PartitionNumberRangePattern ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatapproximately" title="FormatApproximately ( numberFormat, result )"><span class="secnum">15.5.20</span> FormatApproximately ( <var>numberFormat</var>, <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-collapsenumberrange" title="CollapseNumberRange ( result )"><span class="secnum">15.5.21</span> CollapseNumberRange ( <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrange" title="FormatNumericRange ( numberFormat, x, y )"><span class="secnum">15.5.22</span> FormatNumericRange ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrangetoparts" title="FormatNumericRangeToParts ( numberFormat, x, y )"><span class="secnum">15.5.23</span> FormatNumericRangeToParts ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#pluralrules-objects" title="PluralRules Objects"><span class="secnum">16</span> PluralRules Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-constructor" title="The Intl.PluralRules Constructor"><span class="secnum">16.1</span> The Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules" title="Intl.PluralRules ( [ locales [ , options ] ] )"><span class="secnum">16.1.1</span> Intl.PluralRules ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-constructor" title="Properties of the Intl.PluralRules Constructor"><span class="secnum">16.2</span> Properties of the Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype" title="Intl.PluralRules.prototype"><span class="secnum">16.2.1</span> Intl.PluralRules.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.supportedlocalesof" title="Intl.PluralRules.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">16.2.2</span> Intl.PluralRules.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-internal-slots" title="Internal slots"><span class="secnum">16.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-prototype-object" title="Properties of the Intl.PluralRules Prototype Object"><span class="secnum">16.3</span> Properties of the Intl.PluralRules Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.constructor" title="Intl.PluralRules.prototype.constructor"><span class="secnum">16.3.1</span> Intl.PluralRules.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype-%symbol.tostringtag%" title="Intl.PluralRules.prototype [ %Symbol.toStringTag% ]"><span class="secnum">16.3.2</span> Intl.PluralRules.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.select" title="Intl.PluralRules.prototype.select ( value )"><span class="secnum">16.3.3</span> Intl.PluralRules.prototype.select ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.selectrange" title="Intl.PluralRules.prototype.selectRange ( start, end )"><span class="secnum">16.3.4</span> Intl.PluralRules.prototype.selectRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.resolvedoptions" title="Intl.PluralRules.prototype.resolvedOptions ( )"><span class="secnum">16.3.5</span> Intl.PluralRules.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-pluralrules-instances" title="Properties of Intl.PluralRules Instances"><span class="secnum">16.4</span> Properties of Intl.PluralRules Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-abstracts" title="Abstract Operations for PluralRules Objects"><span class="secnum">16.5</span> Abstract Operations for PluralRules Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getoperands" title="GetOperands ( s )"><span class="secnum">16.5.1</span> GetOperands ( <var>s</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-plural-rules-operands-records" title="Plural Rules Operands Records"><span class="secnum">16.5.2</span> Plural Rules Operands Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselect" title="PluralRuleSelect ( locale, type, n, operands )"><span class="secnum">16.5.3</span> PluralRuleSelect ( <var>locale</var>, <var>type</var>, <var>n</var>, <var>operands</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolveplural" title="ResolvePlural ( pluralRules, n )"><span class="secnum">16.5.4</span> ResolvePlural ( <var>pluralRules</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselectrange" title="PluralRuleSelectRange ( locale, type, xp, yp )"><span class="secnum">16.5.5</span> PluralRuleSelectRange ( <var>locale</var>, <var>type</var>, <var>xp</var>, <var>yp</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvepluralrange" title="ResolvePluralRange ( pluralRules, x, y )"><span class="secnum">16.5.6</span> ResolvePluralRange ( <var>pluralRules</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#relativetimeformat-objects" title="RelativeTimeFormat Objects"><span class="secnum">17</span> RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat-constructor" title="The Intl.RelativeTimeFormat Constructor"><span class="secnum">17.1</span> The Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat" title="Intl.RelativeTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">17.1.1</span> Intl.RelativeTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-constructor" title="Properties of the Intl.RelativeTimeFormat Constructor"><span class="secnum">17.2</span> Properties of the Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype" title="Intl.RelativeTimeFormat.prototype"><span class="secnum">17.2.1</span> Intl.RelativeTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.supportedLocalesOf" title="Intl.RelativeTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">17.2.2</span> Intl.RelativeTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat-internal-slots" title="Internal slots"><span class="secnum">17.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-prototype-object" title="Properties of the Intl.RelativeTimeFormat Prototype Object"><span class="secnum">17.3</span> Properties of the Intl.RelativeTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.constructor" title="Intl.RelativeTimeFormat.prototype.constructor"><span class="secnum">17.3.1</span> Intl.RelativeTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype-toStringTag" title="Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">17.3.2</span> Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.format" title="Intl.RelativeTimeFormat.prototype.format ( value, unit )"><span class="secnum">17.3.3</span> Intl.RelativeTimeFormat.prototype.format ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.formatToParts" title="Intl.RelativeTimeFormat.prototype.formatToParts ( value, unit )"><span class="secnum">17.3.4</span> Intl.RelativeTimeFormat.prototype.formatToParts ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat.prototype.resolvedoptions" title="Intl.RelativeTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">17.3.5</span> Intl.RelativeTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-relativetimeformat-instances" title="Properties of Intl.RelativeTimeFormat Instances"><span class="secnum">17.4</span> Properties of Intl.RelativeTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat--abstracts" title="Abstract Operations for RelativeTimeFormat Objects"><span class="secnum">17.5</span> Abstract Operations for RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-singularrelativetimeunit" title="SingularRelativeTimeUnit ( unit )"><span class="secnum">17.5.1</span> SingularRelativeTimeUnit ( <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-PartitionRelativeTimePattern" title="PartitionRelativeTimePattern ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.2</span> PartitionRelativeTimePattern ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makepartslist" title="MakePartsList ( pattern, unit, parts )"><span class="secnum">17.5.3</span> MakePartsList ( <var>pattern</var>, <var>unit</var>, <var>parts</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTime" title="FormatRelativeTime ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.4</span> FormatRelativeTime ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTimeToParts" title="FormatRelativeTimeToParts ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.5</span> FormatRelativeTimeToParts ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#segmenter-objects" title="Segmenter Objects"><span class="secnum">18</span> Segmenter Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-constructor" title="The Intl.Segmenter Constructor"><span class="secnum">18.1</span> The Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter" title="Intl.Segmenter ( [ locales [ , options ] ] )"><span class="secnum">18.1.1</span> Intl.Segmenter ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-constructor" title="Properties of the Intl.Segmenter Constructor"><span class="secnum">18.2</span> Properties of the Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype" title="Intl.Segmenter.prototype"><span class="secnum">18.2.1</span> Intl.Segmenter.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.supportedlocalesof" title="Intl.Segmenter.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">18.2.2</span> Intl.Segmenter.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-internal-slots" title="Internal slots"><span class="secnum">18.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-prototype-object" title="Properties of the Intl.Segmenter Prototype Object"><span class="secnum">18.3</span> Properties of the Intl.Segmenter Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.constructor" title="Intl.Segmenter.prototype.constructor"><span class="secnum">18.3.1</span> Intl.Segmenter.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype-%symbol.tostringtag%" title="Intl.Segmenter.prototype [ %Symbol.toStringTag% ]"><span class="secnum">18.3.2</span> Intl.Segmenter.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.segment" title="Intl.Segmenter.prototype.segment ( string )"><span class="secnum">18.3.3</span> Intl.Segmenter.prototype.segment ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.resolvedoptions" title="Intl.Segmenter.prototype.resolvedOptions ( )"><span class="secnum">18.3.4</span> Intl.Segmenter.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-segmenter-instances" title="Properties of Intl.Segmenter Instances"><span class="secnum">18.4</span> Properties of Intl.Segmenter Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-segments-objects" title="Segments Objects"><span class="secnum">18.5</span> Segments Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentsobject" title="CreateSegmentsObject ( segmenter, string )"><span class="secnum">18.5.1</span> CreateSegmentsObject ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentsprototype%-object" title="The %IntlSegmentsPrototype% Object"><span class="secnum">18.5.2</span> The %IntlSegmentsPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%.containing" title="%IntlSegmentsPrototype%.containing ( index )"><span class="secnum">18.5.2.1</span> %IntlSegmentsPrototype%.containing ( <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%-%symbol.iterator%" title="%IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )"><span class="secnum">18.5.2.2</span> %IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segments-instances" title="Properties of Segments Instances"><span class="secnum">18.5.3</span> Properties of Segments Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-iterator-objects" title="Segment Iterator Objects"><span class="secnum">18.6</span> Segment Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentiterator" title="CreateSegmentIterator ( segmenter, string )"><span class="secnum">18.6.1</span> CreateSegmentIterator ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentiteratorprototype%-object" title="The %IntlSegmentIteratorPrototype% Object"><span class="secnum">18.6.2</span> The %IntlSegmentIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.next" title="%IntlSegmentIteratorPrototype%.next ( )"><span class="secnum">18.6.2.1</span> %IntlSegmentIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.%symbol.tostringtag%" title="%IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">18.6.2.2</span> %IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segment-iterator-instances" title="Properties of Segment Iterator Instances"><span class="secnum">18.6.3</span> Properties of Segment Iterator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-data-objects" title="Segment Data Objects"><span class="secnum">18.7</span> Segment Data Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentdataobject" title="CreateSegmentDataObject ( segmenter, string, startIndex, endIndex )"><span class="secnum">18.7.1</span> CreateSegmentDataObject ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>endIndex</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-abstracts" title="Abstract Operations for Segmenter Objects"><span class="secnum">18.8</span> Abstract Operations for Segmenter Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-findboundary" title="FindBoundary ( segmenter, string, startIndex, direction )"><span class="secnum">18.8.1</span> FindBoundary ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>direction</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-sensitive-functions" title="Locale Sensitive Functions of the ECMAScript Language Specification"><span class="secnum">19</span> Locale Sensitive Functions of the ECMAScript Language Specification</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-string-prototype-object" title="Properties of the String Prototype Object"><span class="secnum">19.1</span> Properties of the String Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-String.prototype.localeCompare" title="String.prototype.localeCompare ( that [ , locales [ , options ] ] )"><span class="secnum">19.1.1</span> String.prototype.localeCompare ( <var>that</var> [ , <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle">+</span><a href="#sup-string.prototype.tolocalelowercase" title="String.prototype.toLocaleLowerCase ( [ locales ] )"><span class="secnum">19.1.2</span> String.prototype.toLocaleLowerCase ( [ <var>locales</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-transform-case" title="TransformCase ( S, locales, targetCase )"><span class="secnum">19.1.2.1</span> TransformCase ( <var>S</var>, <var>locales</var>, <var>targetCase</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sup-string.prototype.tolocaleuppercase" title="String.prototype.toLocaleUpperCase ( [ locales ] )"><span class="secnum">19.1.3</span> String.prototype.toLocaleUpperCase ( [ <var>locales</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-number-prototype-object" title="Properties of the Number Prototype Object"><span class="secnum">19.2</span> Properties of the Number Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-number.prototype.tolocalestring" title="Number.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.2.1</span> Number.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-bigint-prototype-object" title="Properties of the BigInt Prototype Object"><span class="secnum">19.3</span> Properties of the BigInt Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-bigint.prototype.tolocalestring" title="BigInt.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.3.1</span> BigInt.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-date-prototype-object" title="Properties of the Date Prototype Object"><span class="secnum">19.4</span> Properties of the Date Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocalestring" title="Date.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.4.1</span> Date.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaledatestring" title="Date.prototype.toLocaleDateString ( [ locales [ , options ] ] )"><span class="secnum">19.4.2</span> Date.prototype.toLocaleDateString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaletimestring" title="Date.prototype.toLocaleTimeString ( [ locales [ , options ] ] )"><span class="secnum">19.4.3</span> Date.prototype.toLocaleTimeString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-array-prototype-object" title="Properties of the Array Prototype Object"><span class="secnum">19.5</span> Properties of the Array Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-array.prototype.tolocalestring" title="Array.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.5.1</span> Array.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#annex-implementation-dependent-behaviour" title="Implementation Dependent Behaviour"><span class="secnum">A</span> Implementation Dependent Behaviour</a></li><li><span class="item-toggle-none"></span><a href="#annex-incompatibilities" title="Additions and Changes That Introduce Incompatibilities with Prior Editions"><span class="secnum">B</span> Additions and Changes That Introduce Incompatibilities with Prior Editions</a></li><li><span class="item-toggle-none"></span><a href="#sec-colophon" title="Colophon"><span class="secnum">C</span> Colophon</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">D</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Draft ECMA-402 / October 29, 2024</h1><h1 class="title">ECMAScript® 2025 Internationalization API Specification</h1>
 <p><img src="img/ecma-logo.svg" id="ecma-logo"></p>
 <emu-import href="metablock.html"><div id="metadata-block">
   <h1>Contributing to this Specification</h1>
@@ -99,6 +99,7 @@ <h1>Contributing to this Specification</h1>
     </li>
     <li>Editors:
       <ul>
+        <li><a href="mailto:benallen@igalia.com">Ben Allen</a> (<a href="https://github.com/ben-allen" data-print-href="">@ben-allen</a>)</li>
         <li><a href="mailto:richard.gibson+ecma402@gmail.com">Richard Gibson</a> (<a href="https://github.com/gibson042" data-print-href="">@gibson042</a>)</li>
         <li><a href="mailto:ryzokuken@igalia.com">Ujjwal Sharma</a> (<a href="https://github.com/ryzokuken" data-print-href="">@ryzokuken</a>)</li>
       </ul>
@@ -119,7 +120,7 @@ <h1>Introduction</h1>
     This specification's source can be found at <a href="https://github.com/tc39/ecma402">https://github.com/tc39/ecma402</a>.
   </p>
   <p>
-    The ECMAScript 2024 Internationalization API Specification (ECMA-402 11<sup>th</sup> Edition), provides key language sensitive functionality as a complement to the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition or successor). Its functionality has been selected from that of well-established internationalization APIs such as those of the <dfn id="icu" tabindex="-1">Internationalization Components for Unicode (ICU) library</dfn> (<a href="https://unicode-org.github.io/icu-docs/">https://unicode-org.github.io/icu-docs/</a>), of the .NET framework, or of the Java platform.
+    The ECMAScript 2025 Internationalization API Specification (ECMA-402 12<sup>th</sup> Edition), provides key language sensitive functionality as a complement to the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition or successor). Its functionality has been selected from that of well-established internationalization APIs such as those of the <dfn id="icu" tabindex="-1">Internationalization Components for Unicode (ICU) library</dfn> (<a href="https://unicode-org.github.io/icu-docs/">https://unicode-org.github.io/icu-docs/</a>), of the .NET framework, or of the Java platform.
   </p>
   <p>
     The 1<sup>st</sup> Edition API was developed by an ad-hoc group established by Ecma TC39 in September 2010 based on a proposal by Nebojša Ćirić and Jungshik Shin.
@@ -169,6 +170,10 @@ <h1>Introduction</h1>
     Richard Gibson, Ujjwal Sharma<br>
     ECMA-402, 11<sup>th</sup> Edition Project Editors
   </p>
+  <p>
+    Ben Allen, Richard Gibson, Ujjwal Sharma<br>
+    ECMA-402, 12<sup>th</sup> Edition Project Editors
+  </p>
 </emu-intro></emu-import>
 <emu-import href="scope.html"><emu-clause id="scope">
   <h1><span class="secnum">1</span> Scope</h1>
@@ -179,7 +184,7 @@ <h1><span class="secnum">1</span> Scope</h1>
 <emu-import href="conformance.html"><emu-clause id="conformance">
   <h1><span class="secnum">2</span> Conformance</h1>
   <p>
-    A conforming implementation of this specification must conform to the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition, or successor), and must provide and support all the objects, properties, functions, and program semantics described in this specification. Nothing in this specification is intended to allow behaviour that is otherwise prohibited by ECMA-262, and any such conflict should be considered an editorial error rather than an override of constraints from ECMA-262.
+    A conforming implementation of this specification must conform to the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition, or successor), and must provide and support all the objects, properties, functions, and program semantics described in this specification. Nothing in this specification is intended to allow behaviour that is otherwise prohibited by ECMA-262, and any such conflict should be considered an editorial error rather than an override of constraints from ECMA-262.
   </p>
   <p>
     A conforming implementation is permitted to provide additional objects, properties, and functions beyond those described in this specification. In particular, a conforming implementation is permitted to provide properties not described in this specification, and values for those properties, for objects that are described herein. A conforming implementation is not permitted to add optional arguments to the functions defined in this specification.
@@ -207,12 +212,12 @@ <h1><span class="secnum">3</span> Normative References</h1>
   </p>
 
   <p>
-    ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition, or successor).<br>
+    ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition, or successor).<br>
     <a href="https://www.ecma-international.org/publications/standards/Ecma-262.htm">https://www.ecma-international.org/publications/standards/Ecma-262.htm</a>
   </p>
 
   <emu-note><span class="note">Note 1</span><div class="note-contents">
-    Throughout this document, the phrase “es2024, <var>x</var>” (where x is a sequence of numbers separated by periods) may be used as shorthand for "ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition, sub clause <var>x</var>)". Where <var>x</var> is followed by more such sequences of period-separated numbers, separated from each other by commas, each such sequence is also a shorthand for the corresponding sub clause of ECMA-262.
+    Throughout this document, the phrase “es2025, <var>x</var>” (where x is a sequence of numbers separated by periods) may be used as shorthand for "ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition, sub clause <var>x</var>)". Where <var>x</var> is followed by more such sequences of period-separated numbers, separated from each other by commas, each such sequence is also a shorthand for the corresponding sub clause of ECMA-262.
   </div></emu-note>
 
   <ul>
@@ -265,7 +270,7 @@ <h1><span class="secnum">3</span> Normative References</h1>
   <h1><span class="secnum">4</span> Overview</h1>
 
   <p>
-    This section contains a non-normative overview of the ECMAScript 2024 Internationalization API Specification.
+    This section contains a non-normative overview of the ECMAScript 2025 Internationalization API Specification.
   </p>
 
   <emu-clause id="sec-internationalization-localization-globalization">
@@ -275,7 +280,7 @@ <h1><span class="secnum">4.1</span> Internationalization, Localization, and Glob
       Internationalization of software means designing it such that it supports or can be easily adapted to support the needs of users speaking different languages and having different cultural expectations, and enables worldwide communication between them. Localization then is the actual adaptation to a specific language and culture. Globalization of software is commonly understood to be the combination of internationalization and localization. Globalization starts at the lowest level by using a text representation that supports all languages in the world, and using standard identifiers to identify languages, countries, time zones, and other relevant parameters. It continues with using a user interface language and data presentation that the user understands, and finally often requires product-specific adaptations to the user's language, culture, and environment.
     </p>
     <p>
-      The ECMAScript 2024 Language Specification lays the foundation by using Unicode for text representation and by providing a few language-sensitive functions, but gives applications little control over the behaviour of these functions. This specification builds on that foundation by providing a set of customizable language-sensitive functionality. The API is useful even for applications that themselves are not internationalized, as even applications targeting only one language and one region need to properly support that one language and region. However, the API also enables applications that support multiple languages and regions, even concurrently, as may be needed in server environments.
+      The ECMAScript 2025 Language Specification lays the foundation by using Unicode for text representation and by providing a few language-sensitive functions, but gives applications little control over the behaviour of these functions. This specification builds on that foundation by providing a set of customizable language-sensitive functionality. The API is useful even for applications that themselves are not internationalized, as even applications targeting only one language and one region need to properly support that one language and region. However, the API also enables applications that support multiple languages and regions, even concurrently, as may be needed in server environments.
     </p>
   </emu-clause>
 
@@ -283,10 +288,10 @@ <h1><span class="secnum">4.1</span> Internationalization, Localization, and Glob
     <h1><span class="secnum">4.2</span> API Overview</h1>
 
     <p>
-      This specification is designed to complement the ECMAScript 2024 Language Specification by providing key language-sensitive functionality. The API can be added to an implementation of the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition, or successor) in whole or in part. This specification introduces new language values observable to ECMAScript code (such as the value of a <var class="field">[[FallbackSymbol]]</var> internal slot and the set of values transitively reachable from <emu-xref href="#intl-object" id="_ref_208"><a href="#intl-object">%Intl%</a></emu-xref> by <emu-xref href="#sec-property-accessors"><a href="https://tc39.es/ecma262/#sec-property-accessors">property access</a></emu-xref>), and also refines the definition of some functions specified in ECMA-262 (as described below). Neither category prohibits behaviour that is otherwise permitted for values and interfaces defined in ECMA-262, in order to support adoption of this specification by any implementation of ECMA-262.
+      This specification is designed to complement the ECMAScript 2025 Language Specification by providing key language-sensitive functionality. The API can be added to an implementation of the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition, or successor) in whole or in part. This specification introduces new language values observable to ECMAScript code (such as the value of a <var class="field">[[FallbackSymbol]]</var> internal slot and the set of values transitively reachable from <emu-xref href="#intl-object" id="_ref_208"><a href="#intl-object">%Intl%</a></emu-xref> by <emu-xref href="#sec-property-accessors"><a href="https://tc39.es/ecma262/#sec-property-accessors">property access</a></emu-xref>), and also refines the definition of some functions specified in ECMA-262 (as described below). Neither category prohibits behaviour that is otherwise permitted for values and interfaces defined in ECMA-262, in order to support adoption of this specification by any implementation of ECMA-262.
     </p>
     <p>
-      This specification provides several key pieces of language-sensitive functionality that are required in most applications: String comparison (collation), number formatting, date and time formatting, relative time formatting, display names, list formatting, locale selection and operation, pluralization rules, case conversion, and text segmentation. While the ECMAScript 2024 Language Specification provides functions for this basic functionality (on <emu-xref href="#sec-array.prototype"><a href="https://tc39.es/ecma262/#sec-array.prototype">Array.prototype</a></emu-xref>: <code>toLocaleString</code>; on <emu-xref href="#sec-string.prototype"><a href="https://tc39.es/ecma262/#sec-string.prototype">String.prototype</a></emu-xref>: <code>localeCompare</code>, <code>toLocaleLowerCase</code>, <code>toLocaleUpperCase</code>; on <emu-xref href="#sec-number.prototype"><a href="https://tc39.es/ecma262/#sec-number.prototype">Number.prototype</a></emu-xref>: <code>toLocaleString</code>; on <emu-xref href="#sec-date.prototype"><a href="https://tc39.es/ecma262/#sec-date.prototype">Date.prototype</a></emu-xref>: <code>toLocaleString</code>, <code>toLocaleDateString</code>, and <code>toLocaleTimeString</code>), their actual behaviour is left largely implemenation-defined. This specification provides additional functionality, control over the language and over details of the behaviour to be used, and a more complete specification of required functionality.
+      This specification provides several key pieces of language-sensitive functionality that are required in most applications: String comparison (collation), number formatting, date and time formatting, relative time formatting, display names, list formatting, locale selection and operation, pluralization rules, case conversion, and text segmentation. While the ECMAScript 2025 Language Specification provides functions for this basic functionality (on <emu-xref href="#sec-array.prototype"><a href="https://tc39.es/ecma262/#sec-array.prototype">Array.prototype</a></emu-xref>: <code>toLocaleString</code>; on <emu-xref href="#sec-string.prototype"><a href="https://tc39.es/ecma262/#sec-string.prototype">String.prototype</a></emu-xref>: <code>localeCompare</code>, <code>toLocaleLowerCase</code>, <code>toLocaleUpperCase</code>; on <emu-xref href="#sec-number.prototype"><a href="https://tc39.es/ecma262/#sec-number.prototype">Number.prototype</a></emu-xref>: <code>toLocaleString</code>; on <emu-xref href="#sec-date.prototype"><a href="https://tc39.es/ecma262/#sec-date.prototype">Date.prototype</a></emu-xref>: <code>toLocaleString</code>, <code>toLocaleDateString</code>, and <code>toLocaleTimeString</code>), their actual behaviour is left largely implemenation-defined. This specification provides additional functionality, control over the language and over details of the behaviour to be used, and a more complete specification of required functionality.
     </p>
 
     <p>Applications can use the API in two ways:</p>
@@ -295,7 +300,7 @@ <h1><span class="secnum">4.2</span> API Overview</h1>
         Directly, by using a <emu-xref href="#service-constructor" id="_ref_209"><a href="#service-constructor">service constructor</a></emu-xref> to construct an object, specifying a list of preferred languages and options to configure its behaviour. The object provides a main function (<code>compare</code>, <code>select</code>, <code>format</code>, etc.), which can be called repeatedly. It also provides a <code>resolvedOptions</code> function, which the application can use to find out the exact configuration of the object.
       </li>
       <li>
-        Indirectly, by using the functions of the ECMAScript 2024 Language Specification mentioned above. The collation and formatting functions are respecified in this specification to accept the same arguments as the Collator, NumberFormat, and DateTimeFormat <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructors</a></emu-xref> and produce the same results as their compare or format methods. The case conversion functions are respecified to accept a list of preferred languages.
+        Indirectly, by using the functions of the ECMAScript 2025 Language Specification mentioned above. The collation and formatting functions are respecified in this specification to accept the same arguments as the Collator, NumberFormat, and DateTimeFormat <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructors</a></emu-xref> and produce the same results as their compare or format methods. The case conversion functions are respecified to accept a list of preferred languages.
       </li>
     </ol>
 
@@ -361,14 +366,14 @@ <h1><span class="secnum">4.4.1</span> Compatibility across implementations</h1>
   <h1><span class="secnum">5</span> Notational Conventions</h1>
 
   <p>
-    This standard uses a subset of the notational conventions of the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition), as es2024:
+    This standard uses a subset of the notational conventions of the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition), as es2025:
   </p>
 
   <ul>
-    <li>Object Internal Methods and Internal Slots, as described in es2024, <emu-xref href="#sec-object-internal-methods-and-internal-slots"><a href="https://tc39.es/ecma262/#sec-object-internal-methods-and-internal-slots">6.1.7.2</a></emu-xref>.</li>
-    <li>Algorithm conventions, as described in es2024, <emu-xref href="#sec-algorithm-conventions"><a href="https://tc39.es/ecma262/#sec-algorithm-conventions">5.2</a></emu-xref>, and the use of <emu-xref href="#sec-algorithm-conventions-abstract-operations"><a href="https://tc39.es/ecma262/#sec-algorithm-conventions-abstract-operations">abstract operations</a></emu-xref>, as described in es2024, <emu-xref href="#sec-type-conversion"><a href="https://tc39.es/ecma262/#sec-type-conversion">7.1</a></emu-xref>, <emu-xref href="#sec-testing-and-comparison-operations"><a href="https://tc39.es/ecma262/#sec-testing-and-comparison-operations">7.2</a></emu-xref>, <emu-xref href="#sec-operations-on-objects"><a href="https://tc39.es/ecma262/#sec-operations-on-objects">7.3</a></emu-xref>, <emu-xref href="#sec-operations-on-iterator-objects"><a href="https://tc39.es/ecma262/#sec-operations-on-iterator-objects">7.4</a></emu-xref>.</li>
-    <li>Internal Slots, as described in es2024, <emu-xref href="#sec-ordinary-object-internal-methods-and-internal-slots"><a href="https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots">10.1</a></emu-xref>.</li>
-    <li>The <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> and <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> Specification Type, as described in es2024, <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">6.2.2</a></emu-xref>.</li>
+    <li>Object Internal Methods and Internal Slots, as described in es2025, <emu-xref href="#sec-object-internal-methods-and-internal-slots"><a href="https://tc39.es/ecma262/#sec-object-internal-methods-and-internal-slots">6.1.7.2</a></emu-xref>.</li>
+    <li>Algorithm conventions, as described in es2025, <emu-xref href="#sec-algorithm-conventions"><a href="https://tc39.es/ecma262/#sec-algorithm-conventions">5.2</a></emu-xref>, and the use of <emu-xref href="#sec-algorithm-conventions-abstract-operations"><a href="https://tc39.es/ecma262/#sec-algorithm-conventions-abstract-operations">abstract operations</a></emu-xref>, as described in es2025, <emu-xref href="#sec-type-conversion"><a href="https://tc39.es/ecma262/#sec-type-conversion">7.1</a></emu-xref>, <emu-xref href="#sec-testing-and-comparison-operations"><a href="https://tc39.es/ecma262/#sec-testing-and-comparison-operations">7.2</a></emu-xref>, <emu-xref href="#sec-operations-on-objects"><a href="https://tc39.es/ecma262/#sec-operations-on-objects">7.3</a></emu-xref>, <emu-xref href="#sec-operations-on-iterator-objects"><a href="https://tc39.es/ecma262/#sec-operations-on-iterator-objects">7.4</a></emu-xref>.</li>
+    <li>Internal Slots, as described in es2025, <emu-xref href="#sec-ordinary-object-internal-methods-and-internal-slots"><a href="https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots">10.1</a></emu-xref>.</li>
+    <li>The <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> and <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> Specification Type, as described in es2025, <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">6.2.2</a></emu-xref>.</li>
   </ul>
 
   <emu-note><span class="note">Note</span><div class="note-contents">
@@ -387,7 +392,7 @@ <h1><span class="secnum">5</span> Notational Conventions</h1>
     <h1><span class="secnum">5.1</span> Well-Known Intrinsic Objects</h1>
 
     <p>
-      The following table extends the Well-Known Intrinsic Objects table defined in es2024, <emu-xref href="#sec-well-known-intrinsic-objects"><a href="https://tc39.es/ecma262/#sec-well-known-intrinsic-objects">6.1.7.4</a></emu-xref>.
+      The following table extends the Well-Known Intrinsic Objects table defined in es2025, <emu-xref href="#sec-well-known-intrinsic-objects"><a href="https://tc39.es/ecma262/#sec-well-known-intrinsic-objects">6.1.7.4</a></emu-xref>.
     </p>
 
     <emu-table id="table-402-well-known-intrinsic-objects"><figure><figcaption>Table 1: Well-known Intrinsic Objects (Extensions)</figcaption>
@@ -835,7 +840,7 @@ <h1><span class="secnum">6.10</span> Pattern String Types</h1>
   <h1><span class="secnum">7</span> Requirements for Standard Built-in ECMAScript Objects</h1>
 
   <p>
-    Unless specified otherwise in this document, the objects, functions, and <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructors</a></emu-xref> described in this standard are subject to the generic requirements and restrictions specified for standard built-in ECMAScript objects in the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition, or successor), clause <emu-xref href="#sec-ecmascript-standard-built-in-objects"><a href="https://tc39.es/ecma262/#sec-ecmascript-standard-built-in-objects">18</a></emu-xref>.
+    Unless specified otherwise in this document, the objects, functions, and <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructors</a></emu-xref> described in this standard are subject to the generic requirements and restrictions specified for standard built-in ECMAScript objects in the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition, or successor), clause <emu-xref href="#sec-ecmascript-standard-built-in-objects"><a href="https://tc39.es/ecma262/#sec-ecmascript-standard-built-in-objects">18</a></emu-xref>.
   </p>
 </emu-clause></emu-import>
 <emu-import href="intl.html"><emu-clause id="intl-object">
@@ -1255,7 +1260,7 @@ <h1><span class="secnum">10.3.3.2</span> CompareStrings ( <var>collator</var>, <
         <p>The <emu-xref href="#implementation-defined"><a href="https://tc39.es/ecma262/#implementation-defined">implementation-defined</a></emu-xref> abstract operation CompareStrings takes arguments <var>collator</var> (an Intl.Collator), <var>x</var> (a String), and <var>y</var> (a String) and returns a Number, but not <emu-val>NaN</emu-val>. 
             The returned Number represents the result of an <emu-xref href="#implementation-defined"><a href="https://tc39.es/ecma262/#implementation-defined">implementation-defined</a></emu-xref> locale-sensitive String comparison of <var>x</var> with <var>y</var>.
             The result is intended to correspond with a <emu-xref href="#sort-order"><a href="https://tc39.es/ecma262/#sort-order">sort order</a></emu-xref> of String values according to the effective locale and collation options of <var>collator</var>, and will be negative when <var>x</var> is ordered before <var>y</var>, positive when <var>x</var> is ordered after <var>y</var>, and zero in all other cases (representing no relative ordering between <var>x</var> and <var>y</var>).
-            String values must be interpreted as UTF-16 code unit sequences as described in es2024, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>, and a <emu-xref href="#surrogate-pair"><a href="https://tc39.es/ecma262/#surrogate-pair">surrogate pair</a></emu-xref> (a code unit in the range 0xD800 to 0xDBFF followed by a code unit in the range 0xDC00 to 0xDFFF) within a string must be interpreted as the corresponding code point.
+            String values must be interpreted as UTF-16 code unit sequences as described in es2025, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>, and a <emu-xref href="#surrogate-pair"><a href="https://tc39.es/ecma262/#surrogate-pair">surrogate pair</a></emu-xref> (a code unit in the range 0xD800 to 0xDBFF followed by a code unit in the range 0xDC00 to 0xDFFF) within a string must be interpreted as the corresponding code point.
           </p>
 
         <p>
@@ -2504,7 +2509,7 @@ <h1><span class="secnum">11.5.5</span> FormatDateTimePattern ( <var>dateTimeForm
 
     <emu-clause id="sec-partitiondatetimepattern" type="abstract operation" aoid="PartitionDateTimePattern">
       <h1><span class="secnum">11.5.6</span> PartitionDateTimePattern ( <var>dateTimeFormat</var>, <var>x</var> )</h1>
-      <p>The abstract operation PartitionDateTimePattern takes arguments <var>dateTimeFormat</var> (an Intl.DateTimeFormat) and <var>x</var> (a Number) and returns either a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Records</a></emu-xref> with fields <var class="field">[[Type]]</var> (a String) and <var class="field">[[Value]]</var> (a String), or a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">throw completion</a></emu-xref>. It interprets <var>x</var> as a <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">time value</a></emu-xref> as specified in es2024, <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">21.4.1.1</a></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of <var>dateTimeFormat</var>. It performs the following steps when called:</p>
+      <p>The abstract operation PartitionDateTimePattern takes arguments <var>dateTimeFormat</var> (an Intl.DateTimeFormat) and <var>x</var> (a Number) and returns either a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Records</a></emu-xref> with fields <var class="field">[[Type]]</var> (a String) and <var class="field">[[Value]]</var> (a String), or a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">throw completion</a></emu-xref>. It interprets <var>x</var> as a <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">time value</a></emu-xref> as specified in es2025, <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">21.4.1.1</a></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of <var>dateTimeFormat</var>. It performs the following steps when called:</p>
       <emu-alg><ol><li>Let <var>x</var> be <emu-xref aoid="TimeClip"><a href="https://tc39.es/ecma262/#sec-timeclip">TimeClip</a></emu-xref>(<var>x</var>).</li><li>If <var>x</var> is <emu-val>NaN</emu-val>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>epochNanoseconds</var> be <emu-xref aoid="ℤ"><a href="https://tc39.es/ecma262/#ℤ">ℤ</a></emu-xref>(<emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>x</var>) × 10<sup>6</sup>).</li><li>Let <var>format</var> be <var>dateTimeFormat</var>.<var class="field">[[DateTimeFormat]]</var>.</li><li>If <var>dateTimeFormat</var>.<var class="field">[[HourCycle]]</var> is <emu-val>"h11"</emu-val> or <emu-val>"h12"</emu-val>, then<ol><li>Let <var>pattern</var> be <var>format</var>.<var class="field">[[pattern12]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>pattern</var> be <var>format</var>.<var class="field">[[pattern]]</var>.</li></ol></li><li>Let <var>result</var> be <emu-xref aoid="FormatDateTimePattern" id="_ref_532"><a href="#sec-formatdatetimepattern">FormatDateTimePattern</a></emu-xref>(<var>dateTimeFormat</var>, <var>format</var>, <var>pattern</var>, <var>epochNanoseconds</var>).</li><li>Return <var>result</var>.</li></ol></emu-alg>
     </emu-clause>
 
@@ -2522,7 +2527,7 @@ <h1><span class="secnum">11.5.8</span> FormatDateTimeToParts ( <var>dateTimeForm
 
     <emu-clause id="sec-partitiondatetimerangepattern" type="abstract operation" aoid="PartitionDateTimeRangePattern">
       <h1><span class="secnum">11.5.9</span> PartitionDateTimeRangePattern ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</h1>
-      <p>The abstract operation PartitionDateTimeRangePattern takes arguments <var>dateTimeFormat</var> (an Intl.DateTimeFormat), <var>x</var> (a Number), and <var>y</var> (a Number) and returns either a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Records</a></emu-xref> with fields <var class="field">[[Type]]</var> (a String), <var class="field">[[Value]]</var> (a String), and <var class="field">[[Source]]</var> (a String), or a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">throw completion</a></emu-xref>. It interprets <var>x</var> and <var>y</var> as <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">time values</a></emu-xref> as specified in es2024, <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">21.4.1.1</a></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of <var>dateTimeFormat</var>. It performs the following steps when called:</p>
+      <p>The abstract operation PartitionDateTimeRangePattern takes arguments <var>dateTimeFormat</var> (an Intl.DateTimeFormat), <var>x</var> (a Number), and <var>y</var> (a Number) and returns either a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">normal completion containing</a></emu-xref> a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> of <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Records</a></emu-xref> with fields <var class="field">[[Type]]</var> (a String), <var class="field">[[Value]]</var> (a String), and <var class="field">[[Source]]</var> (a String), or a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">throw completion</a></emu-xref>. It interprets <var>x</var> and <var>y</var> as <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">time values</a></emu-xref> as specified in es2025, <emu-xref href="#sec-time-values-and-time-range"><a href="https://tc39.es/ecma262/#sec-time-values-and-time-range">21.4.1.1</a></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of <var>dateTimeFormat</var>. It performs the following steps when called:</p>
       <emu-alg><ol><li>Set <var>x</var> to <emu-xref aoid="TimeClip"><a href="https://tc39.es/ecma262/#sec-timeclip">TimeClip</a></emu-xref>(<var>x</var>).</li><li>If <var>x</var> is <emu-val>NaN</emu-val>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Set <var>y</var> to <emu-xref aoid="TimeClip"><a href="https://tc39.es/ecma262/#sec-timeclip">TimeClip</a></emu-xref>(<var>y</var>).</li><li>If <var>y</var> is <emu-val>NaN</emu-val>, throw a <emu-val>RangeError</emu-val> exception.</li><li>Let <var>xEpochNanoseconds</var> be <emu-xref aoid="ℤ"><a href="https://tc39.es/ecma262/#ℤ">ℤ</a></emu-xref>(<emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>x</var>) × 10<sup>6</sup>).</li><li>Let <var>yEpochNanoseconds</var> be <emu-xref aoid="ℤ"><a href="https://tc39.es/ecma262/#ℤ">ℤ</a></emu-xref>(<emu-xref aoid="ℝ"><a href="https://tc39.es/ecma262/#ℝ">ℝ</a></emu-xref>(<var>y</var>) × 10<sup>6</sup>).</li><li>Let <var>tm1</var> be <emu-xref aoid="ToLocalTime" id="_ref_535"><a href="#sec-tolocaltime">ToLocalTime</a></emu-xref>(<var>xEpochNanoseconds</var>, <var>dateTimeFormat</var>.<var class="field">[[Calendar]]</var>, <var>dateTimeFormat</var>.<var class="field">[[TimeZone]]</var>).</li><li>Let <var>tm2</var> be <emu-xref aoid="ToLocalTime" id="_ref_536"><a href="#sec-tolocaltime">ToLocalTime</a></emu-xref>(<var>yEpochNanoseconds</var>, <var>dateTimeFormat</var>.<var class="field">[[Calendar]]</var>, <var>dateTimeFormat</var>.<var class="field">[[TimeZone]]</var>).</li><li>Let <var>format</var> be <var>dateTimeFormat</var>.<var class="field">[[DateTimeFormat]]</var>.</li><li>If <var>dateTimeFormat</var>.<var class="field">[[HourCycle]]</var> is <emu-val>"h11"</emu-val> or <emu-val>"h12"</emu-val>, then<ol><li>Let <var>pattern</var> be <var>format</var>.<var class="field">[[pattern12]]</var>.</li><li>Let <var>rangePatterns</var> be <var>format</var>.<var class="field">[[rangePatterns12]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>pattern</var> be <var>format</var>.<var class="field">[[pattern]]</var>.</li><li>Let <var>rangePatterns</var> be <var>format</var>.<var class="field">[[rangePatterns]]</var>.</li></ol></li><li>Let <var>selectedRangePattern</var> be <emu-val>undefined</emu-val>.</li><li>Let <var>relevantFieldsEqual</var> be <emu-val>true</emu-val>.</li><li>Let <var>checkMoreFields</var> be <emu-val>true</emu-val>.</li><li>For each row of <emu-xref href="#table-datetimeformat-range-pattern-record" id="_ref_91"><a href="#table-datetimeformat-range-pattern-record">Table 6</a></emu-xref>, except the header row, in table order, do<ol><li>Let <var>fieldName</var> be the name given in the Field Name column of the row.</li><li>If <var>rangePatterns</var> has a field whose name is <var>fieldName</var>, let <var>rangePattern</var> be <var>rangePatterns</var>' field whose name is <var>fieldName</var>; else let <var>rangePattern</var> be <emu-val>undefined</emu-val>.</li><li>If <var>selectedRangePattern</var> is not <emu-val>undefined</emu-val> and <var>rangePattern</var> is <emu-val>undefined</emu-val>, then<ol><li>NOTE: Because there is no range pattern for differences at or below this field, no further checks will be performed.</li><li>Set <var>checkMoreFields</var> to <emu-val>false</emu-val>.</li></ol></li><li>If <var>fieldName</var> is not equal to <var class="field">[[Default]]</var> and <var>relevantFieldsEqual</var> is <emu-val>true</emu-val> and <var>checkMoreFields</var> is <emu-val>true</emu-val>, then<ol><li>Set <var>selectedRangePattern</var> to <var>rangePattern</var>.</li><li>If <var>fieldName</var> is <var class="field">[[AmPm]]</var>, then<ol><li>If <var>tm1</var>.<var class="field">[[Hour]]</var> is less than 12, let <var>v1</var> be <emu-val>"am"</emu-val>; else let <var>v1</var> be <emu-val>"pm"</emu-val>.</li><li>If <var>tm2</var>.<var class="field">[[Hour]]</var> is less than 12, let <var>v2</var> be <emu-val>"am"</emu-val>; else let <var>v2</var> be <emu-val>"pm"</emu-val>.</li></ol></li><li>Else if <var>fieldName</var> is <var class="field">[[DayPeriod]]</var>, then<ol><li>Let <var>v1</var> be a String value representing the day period of <var>tm1</var>; the String value depends upon the implementation and the effective locale of <var>dateTimeFormat</var>.</li><li>Let <var>v2</var> be a String value representing the day period of <var>tm2</var>; the String value depends upon the implementation and the effective locale of <var>dateTimeFormat</var>.</li></ol></li><li>Else if <var>fieldName</var> is <var class="field">[[FractionalSecondDigits]]</var>, then<ol><li>If <var>format</var> has a <var class="field">[[fractionalSecondDigits]]</var> field, then<ol><li>Let <var>fractionalSecondDigits</var> be <var>format</var>.<var class="field">[[fractionalSecondDigits]]</var>.</li></ol></li><li>Else,<ol><li>Let <var>fractionalSecondDigits</var> be 3.</li></ol></li><li>Let <var>exp</var> be <var>fractionalSecondDigits</var> - 3.</li><li>Let <var>v1</var> be <emu-xref aoid="floor"><a href="https://tc39.es/ecma262/#eqn-floor">floor</a></emu-xref>(<var>tm1</var>.<var class="field">[[Millisecond]]</var> × 10<sup><var>exp</var></sup>).</li><li>Let <var>v2</var> be <emu-xref aoid="floor"><a href="https://tc39.es/ecma262/#eqn-floor">floor</a></emu-xref>(<var>tm2</var>.<var class="field">[[Millisecond]]</var> × 10<sup><var>exp</var></sup>).</li></ol></li><li>Else,<ol><li>Let <var>v1</var> be <var>tm1</var>'s field whose name is <var>fieldName</var>.</li><li>Let <var>v2</var> be <var>tm2</var>'s field whose name is <var>fieldName</var>.</li></ol></li><li>If <var>v1</var> is not equal to <var>v2</var>, then<ol><li>Set <var>relevantFieldsEqual</var> to <emu-val>false</emu-val>.</li></ol></li></ol></li></ol></li><li>If <var>relevantFieldsEqual</var> is <emu-val>true</emu-val>, then<ol><li>Let <var>collapsedResult</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>Let <var>resultParts</var> be <emu-xref aoid="FormatDateTimePattern" id="_ref_537"><a href="#sec-formatdatetimepattern">FormatDateTimePattern</a></emu-xref>(<var>dateTimeFormat</var>, <var>format</var>, <var>pattern</var>, <var>xEpochNanoseconds</var>).</li><li>For each <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> { <var class="field">[[Type]]</var>, <var class="field">[[Value]]</var>&nbsp;} <var>r</var> of <var>resultParts</var>, do<ol><li>Append the <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> { <var class="field">[[Type]]</var>: <var>r</var>.<var class="field">[[Type]]</var>, <var class="field">[[Value]]</var>: <var>r</var>.<var class="field">[[Value]]</var>, <var class="field">[[Source]]</var>: <emu-val>"shared"</emu-val>&nbsp;} to <var>collapsedResult</var>.</li></ol></li><li>Return <var>collapsedResult</var>.</li></ol></li><li>Let <var>rangeResult</var> be a new empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>.</li><li>If <var>selectedRangePattern</var> is <emu-val>undefined</emu-val>, then<ol><li>Set <var>selectedRangePattern</var> to <var>rangePatterns</var>.<var class="field">[[Default]]</var>.</li></ol></li><li>For each <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> { <var class="field">[[Pattern]]</var>, <var class="field">[[Source]]</var>&nbsp;} <var>rangePatternPart</var> of <var>selectedRangePattern</var>.<var class="field">[[PatternParts]]</var>, do<ol><li>Let <var>pattern</var> be <var>rangePatternPart</var>.<var class="field">[[Pattern]]</var>.</li><li>Let <var>source</var> be <var>rangePatternPart</var>.<var class="field">[[Source]]</var>.</li><li>If <var>source</var> is <emu-val>"startRange"</emu-val> or <emu-val>"shared"</emu-val>, then<ol><li>Let <var>z</var> be <var>xEpochNanoseconds</var>.</li></ol></li><li>Else,<ol><li>Let <var>z</var> be <var>yEpochNanoseconds</var>.</li></ol></li><li>Let <var>resultParts</var> be <emu-xref aoid="FormatDateTimePattern" id="_ref_538"><a href="#sec-formatdatetimepattern">FormatDateTimePattern</a></emu-xref>(<var>dateTimeFormat</var>, <var>selectedRangePattern</var>, <var>pattern</var>, <var>z</var>).</li><li>For each <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> { <var class="field">[[Type]]</var>, <var class="field">[[Value]]</var>&nbsp;} <var>r</var> of <var>resultParts</var>, do<ol><li>Append the <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> { <var class="field">[[Type]]</var>: <var>r</var>.<var class="field">[[Type]]</var>, <var class="field">[[Value]]</var>: <var>r</var>.<var class="field">[[Value]]</var>, <var class="field">[[Source]]</var>: <var>source</var>&nbsp;} to <var>rangeResult</var>.</li></ol></li></ol></li><li>Return <var>rangeResult</var>.</li></ol></emu-alg>
     </emu-clause>
 
@@ -3482,7 +3487,7 @@ <h1><span class="secnum">15.2.3</span> Internal slots</h1>
           The value of the aforementioned fields (the sign-dependent pattern fields) must be string values that must contain the <emu-xref href="#substring"><a href="https://tc39.es/ecma262/#substring">substring</a></emu-xref> <emu-val>"{number}"</emu-val>.
           <emu-val>"positivePattern"</emu-val> must contain the <emu-xref href="#substring"><a href="https://tc39.es/ecma262/#substring">substring</a></emu-xref> <emu-val>"{plusSign}"</emu-val> but not <emu-val>"{minusSign}"</emu-val>; <emu-val>"negativePattern"</emu-val> must contain the <emu-xref href="#substring"><a href="https://tc39.es/ecma262/#substring">substring</a></emu-xref> <emu-val>"{minusSign}"</emu-val> but not <emu-val>"{plusSign}"</emu-val>; and <emu-val>"zeroPattern"</emu-val> must not contain either <emu-val>"{plusSign}"</emu-val> or <emu-val>"{minusSign}"</emu-val>.
           Additionally, the values within the <emu-val>"percent"</emu-val> field must also contain the <emu-xref href="#substring"><a href="https://tc39.es/ecma262/#substring">substring</a></emu-xref> <emu-val>"{percentSign}"</emu-val>; the values within the <emu-val>"currency"</emu-val> field must also contain one or more of the following substrings: <emu-val>"{currencyCode}"</emu-val>, <emu-val>"{currencyPrefix}"</emu-val>, or <emu-val>"{currencySuffix}"</emu-val>; and the values within the <emu-val>"unit"</emu-val> field must also contain one or more of the following substrings: <emu-val>"{unitPrefix}"</emu-val> or <emu-val>"{unitSuffix}"</emu-val>.
-          The pattern strings, when interpreted as a sequence of UTF-16 encoded code points as described in es2024, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>, must not contain any code points in the General Category "Number, decimal digit" as specified by the Unicode Standard.
+          The pattern strings, when interpreted as a sequence of UTF-16 encoded code points as described in es2025, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>, must not contain any code points in the General Category "Number, decimal digit" as specified by the Unicode Standard.
         </li>
         <li><var class="field">[[LocaleData]]</var>.[[&lt;<var>locale</var>&gt;]] must also have a <var class="field">[[notationSubPatterns]]</var> field for all locale values <var>locale</var>. The value of this field must be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref>, which must have two fields: <var class="field">[[scientific]]</var> and <var class="field">[[compact]]</var>. The <var class="field">[[scientific]]</var> field must be a string value containing the substrings <emu-val>"{number}"</emu-val>, <emu-val>"{scientificSeparator}"</emu-val>, and <emu-val>"{scientificExponent}"</emu-val>. The <var class="field">[[compact]]</var> field must be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> with two fields: <emu-val>"short"</emu-val> and <emu-val>"long"</emu-val>. Each of these fields must be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">Record</a></emu-xref> with <emu-xref href="#integer"><a href="https://tc39.es/ecma262/#integer">integer</a></emu-xref> keys corresponding to all discrete magnitudes the implementation supports for compact notation. Each of these fields must be a string value which may contain the <emu-xref href="#substring"><a href="https://tc39.es/ecma262/#substring">substring</a></emu-xref> <emu-val>"{number}"</emu-val>. Strings descended from <emu-val>"short"</emu-val> must contain the <emu-xref href="#substring"><a href="https://tc39.es/ecma262/#substring">substring</a></emu-xref> <emu-val>"{compactSymbol}"</emu-val>, and strings descended from <emu-val>"long"</emu-val> must contain the <emu-xref href="#substring"><a href="https://tc39.es/ecma262/#substring">substring</a></emu-xref> <emu-val>"{compactName}"</emu-val>.</li>
       </ul>
@@ -5388,7 +5393,7 @@ <h1><span class="secnum">19.1</span> Properties of the String Prototype Object</
       <h1><span class="secnum">19.1.1</span> String.prototype.localeCompare ( <var>that</var> [ , <var>locales</var> [ , <var>options</var> ] ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-string.prototype.localecompare"><a href="https://tc39.es/ecma262/#sec-string.prototype.localecompare">22.1.3.12</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-string.prototype.localecompare"><a href="https://tc39.es/ecma262/#sec-string.prototype.localecompare">22.1.3.12</a></emu-xref>.
       </p>
 
       <p>
@@ -5414,11 +5419,11 @@ <h1><span class="secnum">19.1.1</span> String.prototype.localeCompare ( <var>tha
       <h1><span class="secnum">19.1.2</span> String.prototype.toLocaleLowerCase ( [ <var>locales</var> ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-string.prototype.tolocalelowercase"><a href="https://tc39.es/ecma262/#sec-string.prototype.tolocalelowercase">22.1.3.26</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-string.prototype.tolocalelowercase"><a href="https://tc39.es/ecma262/#sec-string.prototype.tolocalelowercase">22.1.3.26</a></emu-xref>.
       </p>
 
       <p>
-        This function interprets a String value as a sequence of code points, as described in es2024, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>. The following steps are taken:
+        This function interprets a String value as a sequence of code points, as described in es2025, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>. The following steps are taken:
       </p>
 
       <emu-alg><ol><li>Let <var>O</var> be ?&nbsp;<emu-xref aoid="RequireObjectCoercible"><a href="https://tc39.es/ecma262/#sec-requireobjectcoercible">RequireObjectCoercible</a></emu-xref>(<emu-val>this</emu-val> value).</li><li>Let <var>S</var> be ?&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>O</var>).</li><li>Return ?&nbsp;<emu-xref aoid="TransformCase" id="_ref_949"><a href="#sec-transform-case">TransformCase</a></emu-xref>(<var>S</var>, <var>locales</var>, <emu-const>lower</emu-const>).</li></ol></emu-alg>
@@ -5429,7 +5434,7 @@ <h1><span class="secnum">19.1.2</span> String.prototype.toLocaleLowerCase ( [ <v
 
       <emu-clause id="sec-transform-case" type="abstract operation" aoid="TransformCase">
         <h1><span class="secnum">19.1.2.1</span> TransformCase ( <var>S</var>, <var>locales</var>, <var>targetCase</var> )</h1>
-        <p>The abstract operation TransformCase takes arguments <var>S</var> (a String), <var>locales</var> (an <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), and <var>targetCase</var> (<emu-const>lower</emu-const> or <emu-const>upper</emu-const>). It interprets <var>S</var> as a sequence of UTF-16 encoded code points, as described in es2024, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>, and returns the result of <emu-xref href="#sec-implementation-dependencies" id="_ref_950"><a href="#sec-implementation-dependencies">ILD</a></emu-xref> transformation into <var>targetCase</var> as a new String value. It performs the following steps when called:</p>
+        <p>The abstract operation TransformCase takes arguments <var>S</var> (a String), <var>locales</var> (an <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), and <var>targetCase</var> (<emu-const>lower</emu-const> or <emu-const>upper</emu-const>). It interprets <var>S</var> as a sequence of UTF-16 encoded code points, as described in es2025, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>, and returns the result of <emu-xref href="#sec-implementation-dependencies" id="_ref_950"><a href="#sec-implementation-dependencies">ILD</a></emu-xref> transformation into <var>targetCase</var> as a new String value. It performs the following steps when called:</p>
         <emu-alg><ol><li>Let <var>requestedLocales</var> be ?&nbsp;<emu-xref aoid="CanonicalizeLocaleList" id="_ref_951"><a href="#sec-canonicalizelocalelist">CanonicalizeLocaleList</a></emu-xref>(<var>locales</var>).</li><li>If <var>requestedLocales</var> is not an empty <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref>, then<ol><li>Let <var>requestedLocale</var> be <var>requestedLocales</var>[0].</li></ol></li><li>Else,<ol><li>Let <var>requestedLocale</var> be <emu-xref aoid="DefaultLocale" id="_ref_952"><a href="#sec-defaultlocale">DefaultLocale</a></emu-xref>().</li></ol></li><li>Let <var>availableLocales</var> be an <emu-xref href="#available-locales-list" id="_ref_953"><a href="#available-locales-list">Available Locales List</a></emu-xref> which includes the <emu-xref href="#sec-language-tags" id="_ref_954"><a href="#sec-language-tags">language tags</a></emu-xref> for which the Unicode Character Database contains language-sensitive case mappings. If the implementation supports additional locale-sensitive case mappings, <var>availableLocales</var> should also include their corresponding <emu-xref href="#sec-language-tags" id="_ref_955"><a href="#sec-language-tags">language tags</a></emu-xref>.</li><li>Let <var>match</var> be <emu-xref aoid="LookupMatchingLocaleByPrefix" id="_ref_956"><a href="#sec-lookupmatchinglocalebyprefix">LookupMatchingLocaleByPrefix</a></emu-xref>(<var>availableLocales</var>, « <var>requestedLocale</var>&nbsp;»).</li><li>If <var>match</var> is not <emu-val>undefined</emu-val>, let <var>locale</var> be <var>match</var>.<var class="field">[[locale]]</var>; else let <var>locale</var> be <emu-val>"und"</emu-val>.</li><li>Let <var>codePoints</var> be <emu-xref aoid="StringToCodePoints"><a href="https://tc39.es/ecma262/#sec-stringtocodepoints">StringToCodePoints</a></emu-xref>(<var>S</var>).</li><li>If <var>targetCase</var> is <emu-const>lower</emu-const>, then<ol><li>Let <var>newCodePoints</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the result of a lowercase transformation of <var>codePoints</var> according to an implementation-derived algorithm using <var>locale</var> or the Unicode Default Case Conversion algorithm.</li></ol></li><li>Else,<ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>targetCase</var> is <emu-const>upper</emu-const>.</li><li>Let <var>newCodePoints</var> be a <emu-xref href="#sec-list-and-record-specification-type"><a href="https://tc39.es/ecma262/#sec-list-and-record-specification-type">List</a></emu-xref> whose elements are the result of an uppercase transformation of <var>codePoints</var> according to an implementation-derived algorithm using <var>locale</var> or the Unicode Default Case Conversion algorithm.</li></ol></li><li>Return <emu-xref aoid="CodePointsToString"><a href="https://tc39.es/ecma262/#sec-codepointstostring">CodePointsToString</a></emu-xref>(<var>newCodePoints</var>).</li></ol></emu-alg>
 
         <p>
@@ -5446,11 +5451,11 @@ <h1><span class="secnum">19.1.2.1</span> TransformCase ( <var>S</var>, <var>loca
       <h1><span class="secnum">19.1.3</span> String.prototype.toLocaleUpperCase ( [ <var>locales</var> ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-string.prototype.tolocaleuppercase"><a href="https://tc39.es/ecma262/#sec-string.prototype.tolocaleuppercase">22.1.3.27</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-string.prototype.tolocaleuppercase"><a href="https://tc39.es/ecma262/#sec-string.prototype.tolocaleuppercase">22.1.3.27</a></emu-xref>.
       </p>
 
       <p>
-        This function interprets a String value as a sequence of code points, as described in es2024, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>. The following steps are taken:
+        This function interprets a String value as a sequence of code points, as described in es2025, <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">6.1.4</a></emu-xref>. The following steps are taken:
       </p>
 
       <emu-alg><ol><li>Let <var>O</var> be ?&nbsp;<emu-xref aoid="RequireObjectCoercible"><a href="https://tc39.es/ecma262/#sec-requireobjectcoercible">RequireObjectCoercible</a></emu-xref>(<emu-val>this</emu-val> value).</li><li>Let <var>S</var> be ?&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>O</var>).</li><li>Return ?&nbsp;<emu-xref aoid="TransformCase" id="_ref_957"><a href="#sec-transform-case">TransformCase</a></emu-xref>(<var>S</var>, <var>locales</var>, <emu-const>upper</emu-const>).</li></ol></emu-alg>
@@ -5465,14 +5470,14 @@ <h1><span class="secnum">19.1.3</span> String.prototype.toLocaleUpperCase ( [ <v
     <h1><span class="secnum">19.2</span> Properties of the Number Prototype Object</h1>
 
     <p>
-      The following definition(s) refer to the abstract operation thisNumberValue as defined in es2024, <emu-xref href="#sec-properties-of-the-number-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-number-prototype-object">21.1.3</a></emu-xref>.
+      The following definition(s) refer to the abstract operation thisNumberValue as defined in es2025, <emu-xref href="#sec-properties-of-the-number-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-number-prototype-object">21.1.3</a></emu-xref>.
     </p>
 
     <emu-clause id="sup-number.prototype.tolocalestring">
       <h1><span class="secnum">19.2.1</span> Number.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-number.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-number.prototype.tolocalestring">21.1.3.4</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-number.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-number.prototype.tolocalestring">21.1.3.4</a></emu-xref>.
       </p>
 
       <p>
@@ -5487,14 +5492,14 @@ <h1><span class="secnum">19.2.1</span> Number.prototype.toLocaleString ( [ <var>
     <h1><span class="secnum">19.3</span> Properties of the BigInt Prototype Object</h1>
 
     <p>
-      The following definition(s) refer to the abstract operation thisBigIntValue as defined in es2024, <emu-xref href="#sec-properties-of-the-bigint-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-bigint-prototype-object">21.2.3</a></emu-xref>.
+      The following definition(s) refer to the abstract operation thisBigIntValue as defined in es2025, <emu-xref href="#sec-properties-of-the-bigint-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-bigint-prototype-object">21.2.3</a></emu-xref>.
     </p>
 
     <emu-clause id="sup-bigint.prototype.tolocalestring">
       <h1><span class="secnum">19.3.1</span> BigInt.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-bigint.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-bigint.prototype.tolocalestring">21.2.3.2</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-bigint.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-bigint.prototype.tolocalestring">21.2.3.2</a></emu-xref>.
       </p>
 
       <p>
@@ -5509,14 +5514,14 @@ <h1><span class="secnum">19.3.1</span> BigInt.prototype.toLocaleString ( [ <var>
     <h1><span class="secnum">19.4</span> Properties of the Date Prototype Object</h1>
 
     <p>
-      The following definition(s) refer to the abstract operation thisTimeValue as defined in es2024, <emu-xref href="#sec-properties-of-the-date-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-date-prototype-object">21.4.4</a></emu-xref>.
+      The following definition(s) refer to the abstract operation thisTimeValue as defined in es2025, <emu-xref href="#sec-properties-of-the-date-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-date-prototype-object">21.4.4</a></emu-xref>.
     </p>
 
     <emu-clause id="sup-date.prototype.tolocalestring">
       <h1><span class="secnum">19.4.1</span> Date.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-date.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-date.prototype.tolocalestring">21.4.4.39</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-date.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-date.prototype.tolocalestring">21.4.4.39</a></emu-xref>.
       </p>
 
       <p>
@@ -5530,7 +5535,7 @@ <h1><span class="secnum">19.4.1</span> Date.prototype.toLocaleString ( [ <var>lo
       <h1><span class="secnum">19.4.2</span> Date.prototype.toLocaleDateString ( [ <var>locales</var> [ , <var>options</var> ] ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-date.prototype.tolocaledatestring"><a href="https://tc39.es/ecma262/#sec-date.prototype.tolocaledatestring">21.4.4.38</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-date.prototype.tolocaledatestring"><a href="https://tc39.es/ecma262/#sec-date.prototype.tolocaledatestring">21.4.4.38</a></emu-xref>.
       </p>
 
       <p>
@@ -5544,7 +5549,7 @@ <h1><span class="secnum">19.4.2</span> Date.prototype.toLocaleDateString ( [ <va
       <h1><span class="secnum">19.4.3</span> Date.prototype.toLocaleTimeString ( [ <var>locales</var> [ , <var>options</var> ] ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-date.prototype.tolocaletimestring"><a href="https://tc39.es/ecma262/#sec-date.prototype.tolocaletimestring">21.4.4.40</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-date.prototype.tolocaletimestring"><a href="https://tc39.es/ecma262/#sec-date.prototype.tolocaletimestring">21.4.4.40</a></emu-xref>.
       </p>
 
       <p>
@@ -5562,7 +5567,7 @@ <h1><span class="secnum">19.5</span> Properties of the Array Prototype Object</h
       <h1><span class="secnum">19.5.1</span> Array.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</h1>
 
       <p>
-        This definition supersedes the definition provided in es2024, <emu-xref href="#sec-array.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-array.prototype.tolocalestring">23.1.3.32</a></emu-xref>.
+        This definition supersedes the definition provided in es2025, <emu-xref href="#sec-array.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-array.prototype.tolocalestring">23.1.3.32</a></emu-xref>.
       </p>
 
       <p>
@@ -5572,7 +5577,7 @@ <h1><span class="secnum">19.5.1</span> Array.prototype.toLocaleString ( [ <var>l
       <emu-alg><ol><li>Let <var>array</var> be ?&nbsp;<emu-xref aoid="ToObject"><a href="https://tc39.es/ecma262/#sec-toobject">ToObject</a></emu-xref>(<emu-val>this</emu-val> value).</li><li>Let <var>len</var> be ?&nbsp;<emu-xref aoid="LengthOfArrayLike"><a href="https://tc39.es/ecma262/#sec-lengthofarraylike">LengthOfArrayLike</a></emu-xref>(<var>array</var>).</li><li>Let <var>separator</var> be the <emu-xref href="#implementation-defined"><a href="https://tc39.es/ecma262/#implementation-defined">implementation-defined</a></emu-xref> list-separator String value appropriate for the <emu-xref href="#host-environment"><a href="https://tc39.es/ecma262/#host-environment">host environment</a></emu-xref>'s current locale (such as <emu-val>", "</emu-val>).</li><li>Let <var>R</var> be the empty String.</li><li>Let <var>k</var> be 0.</li><li>Repeat, while <var>k</var> &lt; <var>len</var>,<ol><li>If <var>k</var> &gt; 0, then<ol><li>Set <var>R</var> to the <emu-xref href="#string-concatenation"><a href="https://tc39.es/ecma262/#string-concatenation">string-concatenation</a></emu-xref> of <var>R</var> and <var>separator</var>.</li></ol></li><li>Let <var>nextElement</var> be ?&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>array</var>, !&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(<emu-xref aoid="𝔽"><a href="https://tc39.es/ecma262/#𝔽">𝔽</a></emu-xref>(<var>k</var>))).</li><li>If <var>nextElement</var> is not <emu-val>undefined</emu-val> or <emu-val>null</emu-val>, then<ol><li>Let <var>S</var> be ?&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.es/ecma262/#sec-tostring">ToString</a></emu-xref>(? <emu-xref aoid="Invoke"><a href="https://tc39.es/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>nextElement</var>, <emu-val>"toLocaleString"</emu-val>, « <var>locales</var>, <var>options</var>&nbsp;»)).</li><li>Set <var>R</var> to the <emu-xref href="#string-concatenation"><a href="https://tc39.es/ecma262/#string-concatenation">string-concatenation</a></emu-xref> of <var>R</var> and <var>S</var>.</li></ol></li><li>Set <var>k</var> to <var>k</var> + 1.</li></ol></li><li>Return <var>R</var>.</li></ol></emu-alg>
 
       <emu-note><span class="note">Note 1</span><div class="note-contents">
-        This algorithm's steps mirror the steps taken in es2024, <emu-xref href="#sec-array.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-array.prototype.tolocalestring">23.1.3.32</a></emu-xref>, with the exception that <emu-xref aoid="Invoke"><a href="https://tc39.es/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>nextElement</var>, <emu-val>"toLocaleString"</emu-val>) now takes <var>locales</var> and <var>options</var> as arguments.
+        This algorithm's steps mirror the steps taken in es2025, <emu-xref href="#sec-array.prototype.tolocalestring"><a href="https://tc39.es/ecma262/#sec-array.prototype.tolocalestring">23.1.3.32</a></emu-xref>, with the exception that <emu-xref aoid="Invoke"><a href="https://tc39.es/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>nextElement</var>, <emu-val>"toLocaleString"</emu-val>) now takes <var>locales</var> and <var>options</var> as arguments.
       </div></emu-note>
 
       <emu-note><span class="note">Note 2</span><div class="note-contents">
