diff --git a/package.json b/package.json
index e9971cf..9f9494d 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
   "sideEffects": false,
   "type": "module",
   "workspaces": [
+    "packages/html-enumerated-attributes",
     "packages/html-url-attributes",
     "packages/html-whitespace-sensitive-tag-names",
     "packages/hast-util-from-string",
@@ -76,6 +77,7 @@
     "node-fetch": "^2.0.0",
     "parse-author": "^2.0.0",
     "prettier": "^2.0.0",
+    "property-information": "^6.0.0",
     "rehype": "^12.0.0",
     "rehype-cli": "^11.0.0",
     "rehype-format": "^3.0.0",
diff --git a/packages/html-enumerated-attributes/.npmrc b/packages/html-enumerated-attributes/.npmrc
new file mode 100644
index 0000000..43c97e7
--- /dev/null
+++ b/packages/html-enumerated-attributes/.npmrc
@@ -0,0 +1 @@
+package-lock=false
diff --git a/packages/html-enumerated-attributes/index.js b/packages/html-enumerated-attributes/index.js
new file mode 100644
index 0000000..35cc48d
--- /dev/null
+++ b/packages/html-enumerated-attributes/index.js
@@ -0,0 +1,503 @@
+/**
+ * @fileoverview
+ *   Map of enumerated attributes in HTML
+ * @longdescription
+ *   ## Use
+ *
+ *   ```js
+ *   import {enumeratedAttributes} from 'html-enumerated-attributes'
+ *
+ *   enumeratedAttributes.loading
+ *   //=> {selector: 'iframe, img', invalid: 'eager', missing: 'eager', states: ['eager', 'lazy']}
+ *   ```
+ *
+ *   ## API
+ *
+ *   ### `enumeratedAttributes`
+ *
+ *   Map of enumerated attributes in HTML (`Record<string, Definition|Array.<Definition>>`).
+ */
+
+/**
+ * @typedef Definition
+ * @property {string} [selector]
+ * @property {string|null} [missing]
+ * @property {string|null} [invalid]
+ * @property {Array.<null|string|string[]>} states
+ * @property {true} [allowUnknown]
+ * @property {true} [caseSensitive]
+ */
+
+/**
+ * This map exposes a map of property names to one or more definitions.
+ * Each definition defines how that attribute is enumerated.
+ *
+ * @type {Record<string, Definition|Definition[]>}
+ */
+export const enumeratedAttributes = {
+  autocomplete: {
+    selector: 'form',
+    missing: '',
+    invalid: '',
+    states: [['', 'on'], 'off']
+  },
+  behavior: {
+    selector: 'marquee',
+    missing: 'scroll',
+    states: ['alternate', 'scroll', 'slide']
+  },
+  charset: {
+    selector: 'meta, script',
+    // In HTML5, utf8 is implied.
+    // But we let it be here for older versions.
+    states: [
+      ['utf8', 'utf-8', 'unicode-1-1-utf-8'],
+      ['866', 'cp866', 'ibm866', 'csibm866'],
+      [
+        'l1',
+        'ascii',
+        'cp819',
+        'cp1252',
+        'ibm819',
+        'latin1',
+        'us-ascii',
+        'x-cp1252',
+        'iso88591',
+        'iso8859-1',
+        'iso_8859-1',
+        'iso-8859-1',
+        'iso-ir-100',
+        'csisolatin1',
+        'windows-1252',
+        'ansi_x3.4-1968',
+        'iso_8859-1:1987'
+      ],
+      [
+        'l2',
+        'csisolatin2',
+        'iso-8859-2',
+        'iso-ir-101',
+        'iso8859-2',
+        'iso88592',
+        'iso_8859-2',
+        'iso_8859-2:1987',
+        'latin2'
+      ],
+      [
+        'l3',
+        'csisolatin3',
+        'iso-8859-3',
+        'iso-ir-109',
+        'iso8859-3',
+        'iso88593',
+        'iso_8859-3',
+        'iso_8859-3:1988',
+        'latin3'
+      ],
+      [
+        'l4',
+        'csisolatin4',
+        'iso-8859-4',
+        'iso-ir-110',
+        'iso8859-4',
+        'iso88594',
+        'iso_8859-4',
+        'iso_8859-4:1988',
+        'latin4'
+      ],
+      [
+        'l5',
+        'latin5',
+        'cp1254',
+        'x-cp1254',
+        'iso88599',
+        'iso8859-9',
+        'iso-8859-9',
+        'iso_8859-9',
+        'iso-ir-148',
+        'csisolatin5',
+        'windows-1254',
+        'iso_8859-9:1989'
+      ],
+      [
+        'l6',
+        'latin6',
+        'iso885910',
+        'iso-ir-157',
+        'iso8859-10',
+        'csisolatin6',
+        'iso-8859-10'
+      ],
+      [
+        'l9',
+        'iso885915',
+        'iso8859-15',
+        'iso-8859-15',
+        'iso_8859-15',
+        'csisolatin9'
+      ],
+      ['cp1250', 'x-cp1250', 'windows-1250'],
+      ['cp1251', 'x-cp1251', 'windows-1251'],
+      ['cp1253', 'x-cp1253', 'windows-1253'],
+      ['cp1255', 'x-cp1255', 'windows-1255'],
+      ['cp1256', 'x-cp1256', 'windows-1256'],
+      ['cp1257', 'x-cp1257', 'windows-1257'],
+      ['cp1258', 'x-cp1258', 'windows-1258'],
+      [
+        'cyrillic',
+        'iso88595',
+        'iso8859-5',
+        'iso-8859-5',
+        'iso_8859-5',
+        'iso-ir-144',
+        'iso_8859-5:1988',
+        'csisolatincyrillic'
+      ],
+      [
+        'arabic',
+        'iso88596',
+        'ecma-114',
+        'asmo-708',
+        'iso8859-6',
+        'iso-ir-127',
+        'iso_8859-6',
+        'iso-8859-6',
+        'csiso88596e',
+        'csiso88596i',
+        'iso-8859-6-e',
+        'iso-8859-6-i',
+        'iso_8859-6:1987',
+        'csisolatinarabic'
+      ],
+      [
+        'greek',
+        'greek8',
+        'iso88597',
+        'ecma-118',
+        'elot_928',
+        'iso8859-7',
+        'iso-8859-7',
+        'iso_8859-7',
+        'iso-ir-126',
+        'sun_eu_greek',
+        'iso_8859-7:1987',
+        'csisolatingreek'
+      ],
+      [
+        'hebrew',
+        'visual',
+        'iso88598',
+        'iso8859-8',
+        'iso-8859-8',
+        'iso_8859-8',
+        'iso-ir-138',
+        'csiso88598e',
+        'iso-8859-8-e',
+        'iso_8859-8:1988',
+        'csisolatinhebrew'
+      ],
+      ['logical', 'csiso88598i', 'iso-8859-8-i'],
+      ['iso885913', 'iso8859-13', 'iso-8859-13'],
+      ['iso885914', 'iso8859-14', 'iso-8859-14'],
+      ['iso-8859-16'],
+      ['koi', 'koi8', 'koi8-r', 'koi8_r', 'cskoi8r'],
+      ['koi8-u', 'koi8-ru'],
+      ['mac', 'macintosh', 'csmacintosh', 'x-mac-roman'],
+      [
+        'dos-874',
+        'tis-620',
+        'iso885911',
+        'iso8859-11',
+        'iso-8859-11',
+        'windows-874'
+      ],
+      ['x-mac-cyrillic', 'x-mac-ukrainian'],
+      [
+        'gbk',
+        'x-gbk',
+        'gb2312',
+        'chinese',
+        'gb_2312',
+        'csgb2312',
+        'iso-ir-58',
+        'gb_2312-80',
+        'csiso58gb231280'
+      ],
+      ['gb18030'],
+      ['big5', 'csbig5', 'cn-big5', 'x-x-big5', 'big5-hkscs'],
+      ['euc-jp', 'x-euc-jp', 'cseucpkdfmtjapanese'],
+      ['csiso2022jp', 'iso-2022-jp'],
+      [
+        'ms932',
+        'sjis',
+        'x-sjis',
+        'ms_kanji',
+        'shift-jis',
+        'shift_jis',
+        'csshiftjis',
+        'windows-31j'
+      ],
+      [
+        'korean',
+        'euc-kr',
+        'cseuckr',
+        'ksc5601',
+        'ksc_5601',
+        'iso-ir-149',
+        'windows-949',
+        'csksc56011987',
+        'ks_c_5601-1987',
+        'ks_c_5601-1989'
+      ],
+      [
+        'hz-gb-2312',
+        'csiso2022kr',
+        'iso-2022-kr',
+        'iso-2022-cn',
+        'iso-2022-cn-ext'
+      ],
+      ['utf-16be'],
+      ['utf-16', 'utf-16le'],
+      ['x-user-defined']
+    ]
+  },
+  contenteditable: {
+    missing: null,
+    invalid: null,
+    states: [null, ['', 'true'], 'false']
+  },
+  crossorigin: {
+    selector: 'link, img, audio, video, script',
+    missing: null,
+    invalid: '',
+    states: [['', 'anonymous'], 'use-credentials']
+  },
+  decoding: {
+    selector: 'img',
+    missing: '',
+    invalid: '',
+    states: ['sync', 'async', ['', 'auto']]
+  },
+  dir: {
+    missing: '',
+    invalid: '',
+    states: ['', 'ltr', 'rtl', 'auto']
+  },
+  direction: {
+    selector: 'marquee',
+    missing: 'left',
+    states: ['left', 'right', 'up', 'down']
+  },
+  draggable: {
+    missing: null,
+    states: [null, 'true', 'false']
+  },
+  // When changing `encType`, please also change `formenctype`.
+  enctype: {
+    selector: 'form',
+    invalid: 'application/x-www-form-urlencoded',
+    missing: 'application/x-www-form-urlencoded',
+    states: [
+      'application/x-www-form-urlencoded',
+      'multipart/form-data',
+      'text/plain'
+    ]
+  },
+  // When changing `formenctype`, please also change `encType`.
+  formenctype: {
+    selector: 'button, input',
+    invalid: 'application/x-www-form-urlencoded',
+    // Note that `missing: null` here is intentionally different from `encType`.
+    missing: null,
+    states: [
+      'application/x-www-form-urlencoded',
+      'multipart/form-data',
+      'text/plain'
+    ]
+  },
+  // When changing `formmethod`, please also change `method`.
+  formmethod: {
+    selector: 'button, input',
+    invalid: 'get',
+    // Note that `missing: null` here is intentionally different from `formmethod`.
+    missing: null,
+    states: ['dialog', 'get', 'post']
+  },
+  // When changing `formtarget`, please also change `target`.
+  formtarget: {
+    selector: 'button, input',
+    // Note that `missing: null` here is intentionally different from `target`.
+    missing: null,
+    allowUnknown: true,
+    // Note that `formtarget` uses `_self` and `target` uses `['', '_self']`,
+    // which is intentional.
+    states: ['_blank', '_parent', '_self', '_top']
+  },
+  inputmode: {
+    // In fact only applies to `text`, `search`, and `password`.
+    selector: 'input',
+    invalid: '',
+    missing: '',
+    states: [
+      '',
+      'email',
+      'full-width-latin',
+      'kana',
+      'kana-name',
+      'katakana',
+      'latin',
+      'latin-name',
+      'latin-prose',
+      'numeric',
+      'tel',
+      'url',
+      'verbatim'
+    ]
+  },
+  keytype: {
+    selector: 'keygen',
+    missing: 'rsa',
+    states: ['', 'rsa']
+  },
+  kind: {
+    selector: 'track',
+    missing: 'subtitles',
+    invalid: 'metadata',
+    states: ['captions', 'chapters', 'descriptions', 'metadata', 'subtitles']
+  },
+  loading: {
+    selector: 'iframe, img',
+    invalid: 'eager',
+    missing: 'eager',
+    states: ['eager', 'lazy']
+  },
+  // When changing `method`, please also change `formmethod`.
+  method: {
+    selector: 'form',
+    invalid: 'get',
+    missing: 'get',
+    states: ['dialog', 'get', 'post']
+  },
+  preload: {
+    selector: 'audio, video',
+    // Note: https://html.spec.whatwg.org/#attr-media-preload
+    states: [['', 'auto'], 'metadata', 'none']
+  },
+  // Should also apply to `content` on `meta[name=referrer]`.
+  referrerpolicy: {
+    selector: 'a, area, iframe, img, link',
+    missing: '',
+    invalid: '',
+    states: [
+      '',
+      'no-referrer',
+      'no-referrer-when-downgrade',
+      'origin',
+      'origin-when-cross-origin',
+      'unsafe-url'
+    ]
+  },
+  scope: {
+    selector: 'th',
+    missing: '',
+    states: ['', 'col', 'colgroup', 'row', 'rowgroup']
+  },
+  shape: {
+    selector: 'area',
+    missing: 'rect',
+    states: [
+      // The latter are non-conforming.
+      ['rect', 'rectangle'],
+      ['poly', 'polygon'],
+      ['circle', 'circ'],
+      'default'
+    ]
+  },
+  spellcheck: {
+    missing: null,
+    invalid: null,
+    states: [null, ['', 'true'], 'false']
+  },
+  // When changing `target`, please also change `formtarget`.
+  target: {
+    selector: 'a, area, base, form',
+    missing: '',
+    allowUnknown: true,
+    states: ['_blank', '_parent', ['', '_self'], '_top']
+  },
+  translate: {
+    missing: null,
+    invalid: null,
+    states: [['', 'yes'], 'no']
+  },
+  type: [
+    {
+      selector: 'button',
+      missing: 'submit',
+      states: ['button', 'menu', 'reset', 'submit']
+    },
+    {
+      selector: 'input',
+      missing: 'text',
+      states: [
+        'button',
+        'checkbox',
+        'color',
+        'date',
+        'datetime-local',
+        'email',
+        'file',
+        'hidden',
+        'image',
+        'number',
+        'month',
+        'password',
+        'radio',
+        'range',
+        'reset',
+        'search',
+        'submit',
+        'tel',
+        'text',
+        'time',
+        'url',
+        'week'
+      ]
+    },
+    {
+      caseSensitive: true,
+      selector: 'li',
+      missing: '',
+      invalid: '',
+      states: ['1', 'a', 'A', 'i', 'I', 'circle', 'disc', 'square']
+    },
+    {
+      selector: 'menu',
+      missing: '',
+      states: ['', 'context', 'toolbar']
+    },
+    {
+      selector: 'menuitem',
+      missing: 'command',
+      states: ['checkbox', 'command', 'radio']
+    },
+    {
+      caseSensitive: true,
+      selector: 'ol',
+      missing: '1',
+      invalid: '1',
+      states: ['1', 'a', 'A', 'i', 'I']
+    },
+    {
+      selector: 'ul',
+      missing: '',
+      invalid: '',
+      states: ['circle', 'disc', 'square']
+    }
+  ],
+  wrap: {
+    selector: 'textarea',
+    missing: 'soft',
+    states: ['hard', 'soft']
+  }
+}
diff --git a/packages/html-enumerated-attributes/package.json b/packages/html-enumerated-attributes/package.json
new file mode 100644
index 0000000..bbf0615
--- /dev/null
+++ b/packages/html-enumerated-attributes/package.json
@@ -0,0 +1,42 @@
+{
+  "name": "html-enumerated-attributes",
+  "version": "0.0.0",
+  "description": "Map of info on enumerated attributes in HTML",
+  "license": "MIT",
+  "keywords": [
+    "html",
+    "attribute",
+    "property",
+    "enumerated",
+    "attribute"
+  ],
+  "repository": "https://github.com/rehypejs/rehype-minify/tree/main/packages/html-enumerated-attributes",
+  "bugs": "https://github.com/rehypejs/rehype-minify/issues",
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/unified"
+  },
+  "author": "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
+  "contributors": [
+    "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
+  ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "files": [
+    "index.d.ts",
+    "index.js"
+  ],
+  "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage",
+    "test": "node --conditions development test.js"
+  },
+  "xo": false,
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
+  }
+}
diff --git a/packages/html-enumerated-attributes/readme.md b/packages/html-enumerated-attributes/readme.md
new file mode 100644
index 0000000..64a3115
--- /dev/null
+++ b/packages/html-enumerated-attributes/readme.md
@@ -0,0 +1,99 @@
+<!--This file is generated by `build-packages.js`-->
+
+# html-enumerated-attributes
+
+[![Build][build-badge]][build]
+[![Coverage][coverage-badge]][coverage]
+[![Downloads][downloads-badge]][downloads]
+[![Size][size-badge]][size]
+[![Sponsors][sponsors-badge]][collective]
+[![Backers][backers-badge]][collective]
+[![Chat][chat-badge]][chat]
+
+Map of enumerated attributes in HTML.
+
+## Install
+
+This package is [ESM only][esm]:
+Node 12+ is needed to use it and it must be `imported`ed instead of `required`d.
+
+[npm][]:
+
+```sh
+npm install html-enumerated-attributes
+```
+
+This package exports the following identifiers:
+`enumeratedAttributes`.
+There is no default export.
+
+## Use
+
+```js
+import {enumeratedAttributes} from 'html-enumerated-attributes'
+
+enumeratedAttributes.loading
+//=> {selector: 'iframe, img', invalid: 'eager', missing: 'eager', states: ['eager', 'lazy']}
+```
+
+## API
+
+### `enumeratedAttributes`
+
+Map of enumerated attributes in HTML (`Record<string, Definition|Array.<Definition>>`).
+
+## Contribute
+
+See [`contributing.md`][contributing] in [`rehypejs/.github`][health] for ways
+to get started.
+See [`support.md`][support] for ways to get help.
+
+This project has a [code of conduct][coc].
+By interacting with this repository, organization, or community you agree to
+abide by its terms.
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+[build-badge]: https://github.com/rehypejs/rehype-minify/workflows/main/badge.svg
+
+[build]: https://github.com/rehypejs/rehype-minify/actions
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/rehypejs/rehype-minify.svg
+
+[coverage]: https://codecov.io/github/rehypejs/rehype-minify
+
+[downloads-badge]: https://img.shields.io/npm/dm/html-enumerated-attributes.svg
+
+[downloads]: https://www.npmjs.com/package/html-enumerated-attributes
+
+[size-badge]: https://img.shields.io/bundlephobia/minzip/html-enumerated-attributes.svg
+
+[size]: https://bundlephobia.com/result?p=html-enumerated-attributes
+
+[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
+
+[backers-badge]: https://opencollective.com/unified/backers/badge.svg
+
+[collective]: https://opencollective.com/unified
+
+[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
+
+[chat]: https://github.com/rehypejs/rehype/discussions
+
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[health]: https://github.com/rehypejs/.github
+
+[contributing]: https://github.com/rehypejs/.github/blob/main/contributing.md
+
+[support]: https://github.com/rehypejs/.github/blob/main/support.md
+
+[coc]: https://github.com/rehypejs/.github/blob/main/code-of-conduct.md
+
+[license]: https://github.com/rehypejs/rehype-minify/blob/main/license
+
+[author]: https://wooorm.com
diff --git a/packages/html-enumerated-attributes/test.js b/packages/html-enumerated-attributes/test.js
new file mode 100644
index 0000000..202267c
--- /dev/null
+++ b/packages/html-enumerated-attributes/test.js
@@ -0,0 +1,22 @@
+import test from 'tape'
+import {html, find} from 'property-information'
+import {enumeratedAttributes} from './index.js'
+
+const own = {}.hasOwnProperty
+
+test('html-enumerated-attributes', (t) => {
+  /** @type {string} */
+  let key
+
+  for (key in enumeratedAttributes) {
+    if (own.call(enumeratedAttributes, key)) {
+      t.equal(
+        find(html, key).attribute,
+        key,
+        'should match html casing (`' + key + '`)'
+      )
+    }
+  }
+
+  t.end()
+})
diff --git a/packages/html-enumerated-attributes/tsconfig.json b/packages/html-enumerated-attributes/tsconfig.json
new file mode 100644
index 0000000..7e61871
--- /dev/null
+++ b/packages/html-enumerated-attributes/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["*.js"]
+}
diff --git a/packages/rehype-minify-enumerated-attribute/index.js b/packages/rehype-minify-enumerated-attribute/index.js
index dcf8414..89b4b0a 100644
--- a/packages/rehype-minify-enumerated-attribute/index.js
+++ b/packages/rehype-minify-enumerated-attribute/index.js
@@ -12,18 +12,19 @@
  */
 
 import {visit} from 'unist-util-visit'
+import {html, find} from 'property-information'
 import {matches} from 'hast-util-select'
 import {hasProperty} from 'hast-util-has-property'
 import {stringify} from 'space-separated-tokens'
-import {schema} from './schema.js'
-
-const own = {}.hasOwnProperty
+import {enumeratedAttributes} from 'html-enumerated-attributes'
 
 /**
  * @typedef {import('hast').Root} Root
- * @typedef {import('./schema.js').Info} Info
+ * @typedef {import('html-enumerated-attributes').Definition} Definition
  */
 
+const own = {}.hasOwnProperty
+
 /**
  * Minify enumerated attributes.
  *
@@ -40,26 +41,36 @@ export default function rehypeMinifyEnumeratedAttribute() {
       let prop
 
       for (prop in props) {
-        if (own.call(schema, prop) && hasProperty(node, prop)) {
-          let value = props[prop]
+        if (own.call(props, prop) && hasProperty(node, prop)) {
+          const attribute = find(html, prop).attribute
 
-          // Note: we don’t really handle enumerated as lists, so instead
-          // we cast them to a string (assuming they are space-separated).
-          if (Array.isArray(value)) {
-            value = stringify(value)
-          }
+          if (own.call(enumeratedAttributes, attribute)) {
+            let value = props[prop]
 
-          if (typeof value === 'string') {
-            const info = schema[prop]
-            const definitions = Array.isArray(info) ? info : [info]
-            let index = -1
+            // Note: we don’t really handle enumerated as lists, so instead
+            // we cast them to a string (assuming they are space-separated).
+            if (Array.isArray(value)) {
+              value = stringify(value)
+            }
 
-            while (++index < definitions.length) {
-              const definition = definitions[index]
+            if (typeof value === 'string') {
+              const definition = enumeratedAttributes[attribute]
+              const definitions = Array.isArray(definition)
+                ? definition
+                : [definition]
+              let index = -1
 
               // eslint-disable-next-line max-depth
-              if (!definition.selector || matches(definition.selector, node)) {
-                props[prop] = minify(value, definition)
+              while (++index < definitions.length) {
+                const definition = definitions[index]
+
+                // eslint-disable-next-line max-depth
+                if (
+                  !definition.selector ||
+                  matches(definition.selector, node)
+                ) {
+                  props[prop] = minify(value, definition)
+                }
               }
             }
           }
@@ -71,7 +82,7 @@ export default function rehypeMinifyEnumeratedAttribute() {
 
 /**
  * @param {string} value
- * @param {Info} info
+ * @param {Definition} info
  * @returns {string|null}
  */
 function minify(value, info) {
diff --git a/packages/rehype-minify-enumerated-attribute/package.json b/packages/rehype-minify-enumerated-attribute/package.json
index 796a81a..28fb739 100644
--- a/packages/rehype-minify-enumerated-attribute/package.json
+++ b/packages/rehype-minify-enumerated-attribute/package.json
@@ -37,8 +37,10 @@
   ],
   "dependencies": {
     "@types/hast": "^2.0.0",
+    "html-enumerated-attributes": "^0.0.0",
     "hast-util-select": "^5.0.0",
     "hast-util-has-property": "^2.0.0",
+    "property-information": "^6.0.0",
     "space-separated-tokens": "^2.0.0",
     "unified": "^10.0.0",
     "unist-util-visit": "^4.0.0"