8.0.0

Features

• Add subscript and superscript formatting options. (21819)
• Move the Block Patterns UI to the inserter. (20951)
• Improve layout and usability of code editor. (21643)

Enhancements

• Add inserter previews to more blocks. (21740)
• Performance improvements:
  • Import from individual react-dates component. (21914)
  • Upgrade showdown Markdown processor library. (21862)
• Allow title and button-based appender to inherit styles. (21749)
• Output float clearing for all centered blocks. (21608)
• Update 'Welcome Guide' illustrations. (21515)

New APIs

• A new Block Context API has been partially implemented, currently limited to block settings and editor APIs. PHP APIs will be implemented in the next plugin releases. (21467, 21868, 21921)
• Add new "G2"-styled icons to the Icons package. (21209)

Bug Fixes

• Change wp_make_content_images_responsive to wp_filter_content_tags to resolve warnings in WordPress 5.5-alpha. (21514)
• Collapse selection to end after link insertion. (17126)
• Fix selected category on existing Latest Posts blocks. (21359)
• Fix overlapping column contents for embeds. (21570)
• Fix focus styling for date picker calendar days. (21600)
• NPM Packages
  • Fix "Cannot find module '../utils'" error. (21609)
  • Types: Hide element, primitives, icons declarations. (21613, 21784)
• Inherit font styles in block appender placeholder. (21725)
• Allow default pasting behavior in FontSizePicker. (21812)
• Prevent negative custom text sizes. (21815)
• Fix image center alignment behavior. (21911)
• Fix centered buttons margins. (21947)
• Revert the button block to the previous markup. (21923)
• Avoid using inline RichText element for navigation link. (21856)
• Ensure resetEditorBlocks is synchronous. (21839)
• Fix the button outline style for the old button markup. (21816)
• Fix default attribute on audio preload. (21735)
• Fix gradient picker double-click bug. (21732)
• Fix broken links in handbook. (21686)
• Make useMediaQuery return the correct value on the first render. (21682)
• Fix visual issue on windows with 782px. (21661)
• Allow wrapping for Navigation block links. (21632)
• Remove redundant margins from the columns block. (21615)
• Fix media Text padding on inner blocks. (21612)
• Restore floated image margins. (21500)
• Fix URL display for scheduled posts. (21410)
• Test keycode modifiers for keyboard event as exclusive set. (20733)
• Fix focus loss for Guide "Finish" button in Internet Explorer. (20599)
• Replace incorrect Snackbar label attribute with aria-label. (20540)

Experiments

• Add experimental useEditorFeature hook to simplify access to editor features. (21646)
• Navigation menu page:
  • Try a fixed toolbar in the navigation page. (21340)
  • Fix panel collapsing in navigation page. (21633)
  • Fix mobile layout for navigation menu page. (21638)
  • Delete empty spaces in menu REST API endpoint strings. (21453)
• Edit site:
  • Add current theme to template switcher. (21578, 21768)
  • Declare attributes for Template Part block in block.json. (21796)
  • Update end-to-end test for multi-entity saving in site editor. (21363)
  • Add preview options component. (21309)
  • Improve template parts resolution and saving behavior. (21766)
  • Support REST API meta queries. (21851)
  • Add extra validation when loading template parts. (21636)
• Block directory:
  • Add InserterPanel around block directory results. (21748)
• Widgets:
  • Fix legacy widgets z-index issue. (21586)
  • Fix legacy widgets visual issues. (21585)

Deprecations

• Add deprecation notice to useApiFetch hook. (21723)

Code Quality

• Remove nested breakpoint in fullscreen mode CSS. (21496)
• Update npm-package-json-lint from 4.0.3 to 5.0.0. (21597)
• Update npm dependencies that warn. (21596)
• Fix license check script to ignore sub-dependencies of ignored packages. (21606)
• Package TypeScript types improvements:
  • Mark addQueryArgs arguments parameter as optional. (21926)
  • Relax i18n sprintf arguments type. (21919)
• Update PHPCS to latest version. (21680)
• Unify how editor alignments are applied across blocks. (21822)
• Remove obsolete editor alignment classes. (21906)
• Remove old icons. (21821)
• Implement block.json for blocks. (21794, 21783, 21782, 21775, 21787, 21774, 21792)
• Use register_block_type_from_metadata in Latest Posts block. (21788)
• Polish RSS block code. (21773)
• Move camelCaseDash to the package where it is consumed. (21736)
• Improve URLPopover code from review comments. (21621)

Documentation

• Remove duplicate sentence in glossary documentation. (21565)
• Update wp-env docs to reflect current functionality of package. (21809)
• Extract Block Transforms into its own handbook page. (21734)
• Update the index of Block API to reflect current contents. (21726)
• Clarify attribute type documentation. (21694)
• Add location for components style.css. (21654)
• Fix the JSDoc return type for getEntityRecords. (21630)
• Update triage links to new document. (21629)
• Update Getting Started instructions for remote server. (21625)
• Update the "patterns" to reflect "user interface" instead. (21562)
• Create document for contributing with triage. (21350)
• Update triage.md to add more clarity and relevant links. (21802)

Project Management

• Update bug report template to help identify the editor version. (21564)

Various

• End-to-end tests:
  • Add test for template part block creation and insertion. (21849)
  • Add test that template part block customizations are loaded from slug and theme attributes. (21852)
  • Fix tests by removing unnecessary assertions and properly install dependencies in @wordpress/api-fetch. (21780)
  • Add end-to-end test for pinned sidebar items. (21652)
  • Add test which verifies reusable block after refresh. (20605)
• Update cleanForSlug() to remove additional non-word characters. (21007)
• @wordpress/scripts:
  • Support debugging with test-unit-js. (21631, 21861)
  • Install Chromium on demand together with test-e2e script. (20215)
• @wordpress/create-block block scaffold tool:
  • Make it easier to provide most popular CLI options. (21751)
  • Split JavaScript source files into parts for ESNext template. (21750)
• @wordpress/env development environment:
  • Expose port 3306 of MySQL container. (21545)
• @wordpress/eslint-plugin:
  • Add the recommended Prettier config to enforce WP coding styles. (21602)
  • Fix no-unused-vars-before-return JSX identifier reference. (21358)
• Navigation block:
  • Revert changes to data fetching mechanics. (21721)
• Bundle the block autocompleter in the block-editor package. (21534)
• Storybook:
  • Add FormToggle component. (18085)
• Simplify Reusable Block description. (21470)
• Build tooling:
  • Install Composer dependencies as pre-lint step. (21537)
  • Configure Webpack to watch only build files. (21489)
  • Exit with non-zero status on docgen failed parse. (21690)