import { check } from '@markuplint/types';

check('2020-01-01', 'DateTime');
// => { matched: true }

check('2020-02-30', 'DateTime');
// => {
// 	matched: false,
// 	reason: { type: 'out-of-range', gte: 1, lte: 29 },
// 	expects: [],
// 	partName: 'date',
// 	ref: 'https://html.spec.whatwg.org/multipage/text-level-semantics.html#datetime-value',
// 	raw: '30',
// 	offset: 8,
// 	length: 2,
// 	line: 1,
// 	column: 9,
// }

Type Identifiers

Identifier	Use on	Spec	Supported
`Any`	Some attributes		✅
`NoEmptyAny`	Some attributes		✅
`OneLineAny`	Some attributes		✅
`Zero`	Some attributes		✅
`Number`	Some attributes		✅
`Uint`	Some attributes		✅
`JSON`	Attributes on some frameworks etc.		✅
`XMLName`	`svg\|[attributeName]` and more	XML	✅
`DOMID`	The `id` attribute and more	WHATWG	✅
`FunctionBody`	Event handler attributes		🚧
`Pattern`	`input[pattern]`	WHATWG	✅
`DateTime`	`time[datetime]` and more	WHATWG	✅
`TabIndex`	The `tabindex` attribute	WHATWG	✅
`BCP47`	The `lang` attribute and more	RFC	✅
`URL`	Some attributes	WHATWG	✅
`AbsoluteURL`	The `itemtype` attribute (as list)	WHATWG	✅
`HashName`	`img[usemap]`	WHATWG	✅
`OneCodePointChar`	The `accesskey` attribute (as list)	WHATWG	✅
`CustomElementName`	The `is` attribute	WHATWG	✅
~~`BrowsingContextName`~~	Use `NavigableTargetName` instead.	Obsolated	✅
~~`BrowsingContextNameOrKeyword`~~	Use `NavigableTargetNameOrKeyword` instead.	Obsolated	✅
`NavigableTargetName`	`iframe[name]` and more	WHATWG	✅
`NavigableTargetNameOrKeyword`	`a[target]` and more	WHATWG	✅
`HTTPSchemaURL`	`a[ping]` (as list) and more	WHATWG	✅
`MIMEType`	`embed[type]` and more	WHATWG	✅
`ItemProp`	The `itemprop` attribute (as list)	WHATWG	✅
`Srcset`	`img[srcset]` and more	WHATWG	✅
`SourceSizeList`	`img[sizes]` and more	WHATWG	✅
`IconSize`	`link[sizes]` (as list)	WHATWG	✅
`AutoComplete`	`input[autocomplete]` and more	WHATWG	✅
`Accept`	`input[accept]`	WHATWG	✅
`SerializedPermissionsPolicy`	`iframe[allow]`	W3C	✅
`LinkTypeForLinkElement`	`link[rel]`	WHATWG microformats	✅
`LinkTypeForLinkElementInBody`	`link[rel]` in `<body>`	WHATWG microformats	✅
`LinkTypeForAnchorAndAreaElement`	`a[rel]`, `area[rel]`	WHATWG microformats	✅
`LinkTypeForFormElement`	`form[rel]`	WHATWG microformats	✅
`<css-declaration-list>`	The `style` attribute	CSS	✅
`<class-list>`	The `class` attribute	SVG	✅
`<svg-font-size>`	Some attributes for SVG	CSS	🚧
`<svg-font-size-adjust>`	Some attributes for SVG	CSS	🚧
`<'color-profile'>`	Some attributes for SVG	SVG	🚧
`<'color-rendering'>`	Some attributes for SVG	SVG	🚧
`<'enable-background'>`	Some attributes for SVG	SVG	🚧
`<list-of-svg-feature-string>`	Some attributes for SVG	SVG	🚧
`<animatable-value>`	Some attributes for SVG	SVG	🚧
`<begin-value-list>`	Some attributes for SVG	SVG	🚧
`<end-value-list>`	Some attributes for SVG	SVG	🚧
`<list-of-value>`	Some attributes for SVG	SVG	🚧
`<clock-value>`	Some attributes for SVG	SMIL	🚧
`<color-matrix>`	Some attributes for SVG	W3C	✅
`<dasharray>`	Some attributes for SVG	SVG	✅
`<key-points>`	Some attributes for SVG	SVG	✅
`<key-splines>`	Some attributes for SVG	SVG	✅
`<key-times>`	Some attributes for SVG	SVG	✅
`<system-language>`	Some attributes for SVG	SVG	✅
`<origin>`	Some attributes for SVG	SMIL	✅
`<svg-path>`	Some attributes for SVG	SVG	🚧
`<points>`	Some attributes for SVG	SVG	✅
`<preserve-aspect-ratio>`	Some attributes for SVG	SVG	✅
`<view-box>`	Some attributes for SVG	SVG	✅
`<rotate>`	Some attributes for SVG	SVG	✅
`<text-coordinate>`	Some attributes for SVG	SVG	✅
`<list-of-lengths>`	Some attributes for SVG		✅
`<list-of-numbers>`	Some attributes for SVG		✅
`<list-of-percentages>`	Some attributes for SVG		✅
`<number-optional-number>`	Some attributes for SVG		✅

In addition, you can use types CSSTree defined.

Install

$ npm install @markuplint/types

$ yarn add @markuplint/types

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Package last updated on 05 Nov 2025

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