diff --git a/examples/ruleset.ts b/examples/ruleset.ts
index 58b8162..68d7e25 100644
--- a/examples/ruleset.ts
+++ b/examples/ruleset.ts
@@ -17,7 +17,8 @@ import {Ruleset} from '../src/ruleset';
 		value.must.havePropertyWithType('name', 'string'),
 		value.is.iterable(),
 		value.must.be.an.ipv4addr(),
-		value.is.type('array')
+		value.is.type('array'),
+		value.is.an.html5Tag()
 	);
 
 	console.debug(`Rules: ${ruleset.rules.length}`);
diff --git a/src/block/an.ts b/src/block/an.ts
index 5576beb..acd08f0 100644
--- a/src/block/an.ts
+++ b/src/block/an.ts
@@ -26,6 +26,7 @@
 import {Block} from '../block';
 import {type MatcherFactory} from '../matcher/factory';
 import {matcherMkArray} from '../matcher/mk/array';
+import {matcherMkHtml5Tag} from '../matcher/mk/html5/tag';
 import {matcherMkInt} from '../matcher/mk/int';
 import {matcherMkIpv4Addr} from '../matcher/mk/ipv4addr';
 import {matcherMkIpv6Addr} from '../matcher/mk/ipv6addr';
@@ -41,6 +42,7 @@ export class BlockAn<InputT = unknown> extends Block<Statement<InputT>> {
 	public readonly int: MatcherFactory<InputT, never, BlockLink<InputT>>;
 	public readonly ipv4addr: MatcherFactory<InputT, never, BlockLink<InputT>>;
 	public readonly ipv6addr: MatcherFactory<InputT, never, BlockLink<InputT>>;
+	public readonly html5Tag: MatcherFactory<InputT, never, BlockLink<InputT>>;
 
 	constructor(init: BlockInit<InputT>) {
 		super(
@@ -56,5 +58,6 @@ export class BlockAn<InputT = unknown> extends Block<Statement<InputT>> {
 		this.int = matcherMkInt<InputT>(init);
 		this.ipv4addr = matcherMkIpv4Addr<InputT>(init);
 		this.ipv6addr = matcherMkIpv6Addr<InputT>(init);
+		this.html5Tag = matcherMkHtml5Tag<InputT>(init);
 	}
 }
diff --git a/src/block/is.ts b/src/block/is.ts
index 3d62edb..3e05c59 100644
--- a/src/block/is.ts
+++ b/src/block/is.ts
@@ -38,6 +38,8 @@ import {matcherMkBetween} from '../matcher/mk/between';
 import {type Primitive} from '@toreda/types';
 import {matcherMkIterable} from '../matcher/mk/iterable';
 import {matcherMkTruthy} from '../matcher/mk/truthy';
+import {BlockA} from './a';
+import {BlockAn} from './an';
 
 /**
  * Matchers following 'is' in rule statements.
@@ -70,6 +72,9 @@ export class BlockIs<InputT = unknown> extends Block<Statement<InputT>> {
 	public readonly empty: MatcherFactory<InputT, unknown, BlockLink<InputT>>;
 	public readonly divisibleBy: MatcherFactory<InputT, number, BlockLink<InputT>>;
 	public readonly type: MatcherFactory<InputT, string, BlockLink<InputT>>;
+	public readonly an: BlockAn<InputT>;
+	public readonly a: BlockA<InputT>;
+
 	/**
 	 * Determine if `value` supports iteration, but does check for a specific iterable type.
 	 */
@@ -92,6 +97,17 @@ export class BlockIs<InputT = unknown> extends Block<Statement<InputT>> {
 			init.stmt
 		);
 
+		this.an = new BlockAn<InputT>({
+			...init,
+			name: 'an',
+			tracer: this.tracer
+		});
+		this.a = new BlockA<InputT>({
+			...init,
+			name: 'a',
+			tracer: this.tracer
+		});
+
 		this.between = matcherMkBetween<InputT>({
 			...init,
 			tracer: this.tracer,
diff --git a/src/html5/tag.ts b/src/html5/tag.ts
new file mode 100644
index 0000000..b35f7d0
--- /dev/null
+++ b/src/html5/tag.ts
@@ -0,0 +1,147 @@
+/**
+ *	MIT License
+ *
+ *	Copyright (c) 2019 - 2024 Toreda, Inc.
+ *
+ *	Permission is hereby granted, free of charge, to any person obtaining a copy
+ *	of this software and associated documentation files (the "Software"), to deal
+ *	in the Software without restriction, including without limitation the rights
+ *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *	copies of the Software, and to permit persons to whom the Software is
+ *	furnished to do so, subject to the following conditions:
+
+ * 	The above copyright notice and this permission notice shall be included in all
+ * 	copies or substantial portions of the Software.
+ *
+ * 	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * 	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * 	SOFTWARE.
+ *
+ */
+
+/**
+ * @category		Validators – Html5
+ */
+export type Html5Tag =
+	| 'area'
+	| 'article'
+	| 'aside'
+	| 'audio'
+	| 'b'
+	| 'base'
+	| 'basefront'
+	| 'bdi'
+	| 'bdo'
+	| 'blockquote'
+	| 'body'
+	| 'br'
+	| 'button'
+	| 'canvas'
+	| 'caption'
+	| 'cite'
+	| 'code'
+	| 'col'
+	| 'colgroup'
+	| 'data'
+	| 'del'
+	| 'details'
+	| 'dfn'
+	| 'dialog'
+	| 'dir'
+	| 'div'
+	| 'dl'
+	| 'dt'
+	| 'em'
+	| 'embed'
+	| 'fieldset'
+	| 'figcaption'
+	| 'figure'
+	| 'font'
+	| 'footer'
+	| 'form'
+	| 'frame'
+	| 'frameset'
+	| 'h1'
+	| 'h2'
+	| 'h3'
+	| 'h4'
+	| 'h5'
+	| 'h6'
+	| 'head'
+	| 'header'
+	| 'hgroup'
+	| 'hr'
+	| 'html'
+	| 'i'
+	| 'iframe'
+	| 'img'
+	| 'input'
+	| 'ins'
+	| 'kbd'
+	| 'keygen'
+	| 'label'
+	| 'legend'
+	| 'li'
+	| 'link'
+	| 'main'
+	| 'map'
+	| 'mark'
+	| 'menu'
+	| 'menuitem'
+	| 'meta'
+	| 'meter'
+	| 'nav'
+	| 'noframes'
+	| 'noscript'
+	| 'object'
+	| 'ol'
+	| 'optgroup'
+	| 'option'
+	| 'output'
+	| 'p'
+	| 'param'
+	| 'picture'
+	| 'pre'
+	| 'progress'
+	| 'q'
+	| 'rp'
+	| 'rt'
+	| 'ruby'
+	| 's'
+	| 'samp'
+	| 'script'
+	| 'section'
+	| 'select'
+	| 'small'
+	| 'source'
+	| 'span'
+	| 'strike'
+	| 'strong'
+	| 'style'
+	| 'sub'
+	| 'summary'
+	| 'sup'
+	| 'svg'
+	| 'table'
+	| 'tbody'
+	| 'td'
+	| 'template'
+	| 'textarea'
+	| 'tfoot'
+	| 'th'
+	| 'thead'
+	| 'time'
+	| 'title'
+	| 'tr'
+	| 'track'
+	| 'tt'
+	| 'u'
+	| 'ul'
+	| 'var'
+	| 'video'
+	| 'wbr'
+	| string;
diff --git a/src/html5/tags.ts b/src/html5/tags.ts
new file mode 100644
index 0000000..77191eb
--- /dev/null
+++ b/src/html5/tags.ts
@@ -0,0 +1,121 @@
+import {type Html5Tag} from './tag';
+
+export const html5Tags: Set<Html5Tag> = new Set<Html5Tag>([
+	'area',
+	'article',
+	'aside',
+	'audio',
+	'b',
+	'base',
+	'basefront',
+	'bdi',
+	'bdo',
+	'blockquote',
+	'body',
+	'br',
+	'button',
+	'canvas',
+	'caption',
+	'cite',
+	'code',
+	'col',
+	'colgroup',
+	'data',
+	'del',
+	'details',
+	'dfn',
+	'dialog',
+	'dir',
+	'div',
+	'dl',
+	'dt',
+	'em',
+	'embed',
+	'fieldset',
+	'figcaption',
+	'figure',
+	'font',
+	'footer',
+	'form',
+	'frame',
+	'frameset',
+	'h1',
+	'h2',
+	'h3',
+	'h4',
+	'h5',
+	'h6',
+	'head',
+	'header',
+	'hgroup',
+	'hr',
+	'html',
+	'i',
+	'iframe',
+	'img',
+	'input',
+	'ins',
+	'kbd',
+	'keygen',
+	'label',
+	'legend',
+	'li',
+	'link',
+	'main',
+	'map',
+	'mark',
+	'menu',
+	'menuitem',
+	'meta',
+	'meter',
+	'nav',
+	'noframes',
+	'noscript',
+	'object',
+	'ol',
+	'optgroup',
+	'option',
+	'output',
+	'p',
+	'param',
+	'picture',
+	'pre',
+	'progress',
+	'q',
+	'rp',
+	'rt',
+	'ruby',
+	's',
+	'samp',
+	'script',
+	'section',
+	'select',
+	'small',
+	'source',
+	'span',
+	'strike',
+	'strong',
+	'style',
+	'sub',
+	'summary',
+	'sup',
+	'svg',
+	'table',
+	'tbody',
+	'td',
+	'template',
+	'textarea',
+	'tfoot',
+	'th',
+	'thead',
+	'time',
+	'title',
+	'tr',
+	'track',
+	'tt',
+	'u',
+	'ul',
+	'var',
+	'video',
+	'wbr'
+]);
diff --git a/src/index.ts b/src/index.ts
index bfbf9d9..5dc6898 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -44,6 +44,8 @@ export {ErrorContext} from './error/context';
 export {ErrorContextData} from './error/context/data';
 export {errorMkCode} from './error/mk/code';
 export {greaterThan} from './greater/than';
+export {Html5Tag} from './html5/tag';
+export {html5Tags} from './html5/tags';
 export {isArray} from './is/array';
 export {isArrayEmpty} from './is/array/empty';
 export {isArrayNotEmpty} from './is/array/not/empty';
diff --git a/src/is/html5/tag.ts b/src/is/html5/tag.ts
new file mode 100644
index 0000000..3d9650a
--- /dev/null
+++ b/src/is/html5/tag.ts
@@ -0,0 +1,44 @@
+/**
+ *	MIT License
+ *
+ *	Copyright (c) 2019 - 2024 Toreda, Inc.
+ *
+ *	Permission is hereby granted, free of charge, to any person obtaining a copy
+ *	of this software and associated documentation files (the "Software"), to deal
+ *	in the Software without restriction, including without limitation the rights
+ *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *	copies of the Software, and to permit persons to whom the Software is
+ *	furnished to do so, subject to the following conditions:
+
+ * 	The above copyright notice and this permission notice shall be included in all
+ * 	copies or substantial portions of the Software.
+ *
+ * 	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * 	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * 	SOFTWARE.
+ *
+ */
+
+import {type Html5Tag} from '../../html5/tag';
+import {html5Tags} from '../../html5/tags';
+
+/**
+ * Determine if value is a strict boolean type. Does not return true for
+ * otherwise truthy non-boolean values.
+ * @param value
+ * @returns
+ *
+ * @category		Validators – Html5
+ */
+export function isHtml5Tag(value: unknown): value is Html5Tag {
+	if (typeof value !== 'string') {
+		return false;
+	}
+
+	const lower = value.toLocaleLowerCase().trim();
+	return html5Tags.has(lower);
+}
diff --git a/src/matcher/mk/html5/tag.ts b/src/matcher/mk/html5/tag.ts
new file mode 100644
index 0000000..2828763
--- /dev/null
+++ b/src/matcher/mk/html5/tag.ts
@@ -0,0 +1,59 @@
+/**
+ *	MIT License
+ *
+ *	Copyright (c) 2019 - 2024 Toreda, Inc.
+ *
+ *	Permission is hereby granted, free of charge, to any person obtaining a copy
+ *	of this software and associated documentation files (the "Software"), to deal
+ *	in the Software without restriction, including without limitation the rights
+ *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *	copies of the Software, and to permit persons to whom the Software is
+ *	furnished to do so, subject to the following conditions:
+
+ * 	The above copyright notice and this permission notice shall be included in all
+ * 	copies or substantial portions of the Software.
+ *
+ * 	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * 	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * 	SOFTWARE.
+ *
+ */
+
+import {isIpv6Addr} from '@toreda/strong-types';
+import {type BlockInit} from '../../../block/init';
+import {BlockLink} from '../../../block/link';
+
+import {type Predicate} from '../../../predicate';
+import {type MatcherFactory} from '../../factory';
+import {isHtml5Tag} from '../../../is/html5/tag';
+
+/**
+ *
+ * @category Matcher Factories
+ */
+export function matcherMkHtml5Tag<InputT = unknown>(
+	init: BlockInit<InputT>
+): MatcherFactory<InputT, never, BlockLink<InputT>> {
+	return () => {
+		// Link object MUST BE created during matcher func invocation. Moving it out into the surrounding closure
+		// will cause infinite recursion & stack overflow.
+		const link = new BlockLink<InputT>(init);
+
+		const func: Predicate<InputT> = async (value?: InputT | null): Promise<boolean> => {
+			return isHtml5Tag(value);
+		};
+
+		init.stmt.addMatcher({
+			fn: func,
+			name: 'html5Tag',
+			flags: init.flags,
+			tracer: init.tracer
+		});
+
+		return link;
+	};
+}
diff --git a/src/matcher/mk/less/or/equal/to.ts b/src/matcher/mk/less/or/equal/to.ts
new file mode 100644
index 0000000..478f963
--- /dev/null
+++ b/src/matcher/mk/less/or/equal/to.ts
@@ -0,0 +1,66 @@
+/**
+ *	MIT License
+ *
+ *	Copyright (c) 2019 - 2024 Toreda, Inc.
+ *
+ *	Permission is hereby granted, free of charge, to any person obtaining a copy
+ *	of this software and associated documentation files (the "Software"), to deal
+ *	in the Software without restriction, including without limitation the rights
+ *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *	copies of the Software, and to permit persons to whom the Software is
+ *	furnished to do so, subject to the following conditions:
+
+ * 	The above copyright notice and this permission notice shall be included in all
+ * 	copies or substantial portions of the Software.
+ *
+ * 	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * 	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * 	SOFTWARE.
+ *
+ */
+
+import {type BlockInit} from '../../../../../block/init';
+import {BlockLink} from '../../../../../block/link';
+import {equalTo} from '../../../../../equal/to';
+import {lessThan} from '../../../../../less/than';
+import {type Predicate} from '../../../../../predicate';
+import {type MatcherFactory} from '../../../../factory';
+/**
+ * Create matcher for validation chain which determines if chain value is less
+ * than or equal to target.
+ * @param init
+ * @returns
+ *
+ * @category Matcher Predicate Factories
+ */
+export function matcherMkLessThanOrEqualTo<InputT = unknown>(
+	init: BlockInit<InputT>
+): MatcherFactory<InputT, number, BlockLink<InputT>> {
+	return (right: number): BlockLink<InputT> => {
+		// Link object MUST BE created during matcher func invocation. Moving it out into the surrounding closure
+		// will cause infinite recursion & stack overflow.
+		const link = new BlockLink<InputT>(init);
+		init.tracer.addParam(right);
+
+		const func: Predicate<InputT> = async (value?: InputT | null): Promise<boolean> => {
+			if (equalTo(value, right)) {
+				return true;
+			}
+
+			return lessThan(value, right);
+		};
+
+		init.stmt.addMatcher({
+			fn: func,
+			name: '<=',
+			flags: init.flags,
+			tracer: init.tracer
+		});
+
+		return link;
+	};
+}
diff --git a/tests/html5/tag.spec.ts b/tests/html5/tag.spec.ts
new file mode 100644
index 0000000..7e3fbb6
--- /dev/null
+++ b/tests/html5/tag.spec.ts
@@ -0,0 +1,532 @@
+import {isHtml5Tag} from '../../src/is/html5/tag';
+import {type TestCase} from '../_lib/test/case';
+const EMPTY_ARRAY: unknown[] = [];
+const EMPTY_OBJECT: unknown[] = [];
+
+const TEST_CASES: TestCase[] = [
+	{
+		value: undefined,
+		label: 'undefined',
+		result: false
+	},
+	{
+		value: null,
+		label: 'null',
+		result: false
+	},
+	{
+		value: '',
+		label: 'empty string',
+		result: false
+	},
+	{
+		value: 1,
+		result: false
+	},
+	{
+		value: 0,
+		result: false
+	},
+	{
+		value: 'area',
+		result: true
+	},
+	{
+		value: 'aside',
+		result: true
+	},
+	{
+		value: 'article',
+		result: true
+	},
+	{
+		value: 'audio',
+		result: true
+	},
+	{
+		value: 'b',
+		result: true
+	},
+	{
+		value: 'base',
+		result: true
+	},
+	{
+		value: 'basefront',
+		result: true
+	},
+	{
+		value: 'bdi',
+		result: true
+	},
+	{
+		value: 'bdo',
+		result: true
+	},
+	{
+		value: 'blockquote',
+		result: true
+	},
+	{
+		value: 'body',
+		result: true
+	},
+	{
+		value: 'br',
+		result: true
+	},
+	{
+		value: 'button',
+		result: true
+	},
+	{
+		value: 'body',
+		result: true
+	},
+	{
+		value: 'br',
+		result: true
+	},
+	{
+		value: 'button',
+		result: true
+	},
+	{
+		value: 'canvas',
+		result: true
+	},
+	{
+		value: 'caption',
+		result: true
+	},
+	{
+		value: 'cite',
+		result: true
+	},
+	{
+		value: 'code',
+		result: true
+	},
+	{
+		value: 'col',
+		result: true
+	},
+	{
+		value: 'colgroup',
+		result: true
+	},
+	{
+		value: 'data',
+		result: true
+	},
+	{
+		value: 'del',
+		result: true
+	},
+	{
+		value: 'details',
+		result: true
+	},
+	{
+		value: 'dfn',
+		result: true
+	},
+	{
+		value: 'dialog',
+		result: true
+	},
+	{
+		value: 'dir',
+		result: true
+	},
+	{
+		value: 'div',
+		result: true
+	},
+	{
+		value: 'dl',
+		result: true
+	},
+	{
+		value: 'dt',
+		result: true
+	},
+	{
+		value: 'em',
+		result: true
+	},
+	{
+		value: 'embed',
+		result: true
+	},
+	{
+		value: 'fieldset',
+		result: true
+	},
+	{
+		value: 'figcaption',
+		result: true
+	},
+	{
+		value: 'figure',
+		result: true
+	},
+	{
+		value: 'font',
+		result: true
+	},
+	{
+		value: 'footer',
+		result: true
+	},
+	{
+		value: 'form',
+		result: true
+	},
+	{
+		value: 'frame',
+		result: true
+	},
+	{
+		value: 'frameset',
+		result: true
+	},
+	{
+		value: 'h1',
+		result: true
+	},
+	{
+		value: 'h2',
+		result: true
+	},
+	{
+		value: 'h3',
+		result: true
+	},
+	{
+		value: 'h4',
+		result: true
+	},
+	{
+		value: 'h5',
+		result: true
+	},
+	{
+		value: 'h6',
+		result: true
+	},
+	{
+		value: 'head',
+		result: true
+	},
+	{
+		value: 'header',
+		result: true
+	},
+	{
+		value: 'hgroup',
+		result: true
+	},
+	{
+		value: 'hr',
+		result: true
+	},
+	{
+		value: 'html',
+		result: true
+	},
+	{
+		value: 'i',
+		result: true
+	},
+	{
+		value: 'iframe',
+		result: true
+	},
+	{
+		value: 'img',
+		result: true
+	},
+	{
+		value: 'input',
+		result: true
+	},
+	{
+		value: 'ins',
+		result: true
+	},
+	{
+		value: 'kbd',
+		result: true
+	},
+	{
+		value: 'keygen',
+		result: true
+	},
+	{
+		value: 'label',
+		result: true
+	},
+	{
+		value: 'legend',
+		result: true
+	},
+	{
+		value: 'li',
+		result: true
+	},
+	{
+		value: 'link',
+		result: true
+	},
+	{
+		value: 'main',
+		result: true
+	},
+	{
+		value: 'map',
+		result: true
+	},
+	{
+		value: 'mark',
+		result: true
+	},
+	{
+		value: 'menu',
+		result: true
+	},
+	{
+		value: 'menuitem',
+		result: true
+	},
+	{
+		value: 'meta',
+		result: true
+	},
+	{
+		value: 'meter',
+		result: true
+	},
+	{
+		value: 'nav',
+		result: true
+	},
+	{
+		value: 'noframes',
+		result: true
+	},
+	{
+		value: 'noscript',
+		result: true
+	},
+	{
+		value: 'object',
+		result: true
+	},
+	{
+		value: 'ol',
+		result: true
+	},
+	{
+		value: 'optgroup',
+		result: true
+	},
+	{
+		value: 'option',
+		result: true
+	},
+	{
+		value: 'output',
+		result: true
+	},
+	{
+		value: 'p',
+		result: true
+	},
+	{
+		value: 'param',
+		result: true
+	},
+	{
+		value: 'picture',
+		result: true
+	},
+	{
+		value: 'pre',
+		result: true
+	},
+	{
+		value: 'progress',
+		result: true
+	},
+	{
+		value: 'q',
+		result: true
+	},
+	{
+		value: 'rp',
+		result: true
+	},
+	{
+		value: 'rt',
+		result: true
+	},
+	{
+		value: 'ruby',
+		result: true
+	},
+	{
+		value: 's',
+		result: true
+	},
+	{
+		value: 'samp',
+		result: true
+	},
+	{
+		value: 'script',
+		result: true
+	},
+	{
+		value: 'section',
+		result: true
+	},
+	{
+		value: 'select',
+		result: true
+	},
+	{
+		value: 'small',
+		result: true
+	},
+	{
+		value: 'source',
+		result: true
+	},
+	{
+		value: 'span',
+		result: true
+	},
+	{
+		value: 'strike',
+		result: true
+	},
+	{
+		value: 'strong',
+		result: true
+	},
+	{
+		value: 'style',
+		result: true
+	},
+	{
+		value: 'sub',
+		result: true
+	},
+	{
+		value: 'summary',
+		result: true
+	},
+	{
+		value: 'sup',
+		result: true
+	},
+	{
+		value: 'svg',
+		result: true
+	},
+	{
+		value: 'table',
+		result: true
+	},
+	{
+		value: 'tbody',
+		result: true
+	},
+	{
+		value: 'td',
+		result: true
+	},
+	{
+		value: 'template',
+		result: true
+	},
+	{
+		value: 'textarea',
+		result: true
+	},
+	{
+		value: 'tfoot',
+		result: true
+	},
+	{
+		value: 'th',
+		result: true
+	},
+	{
+		value: 'thead',
+		result: true
+	},
+	{
+		value: 'time',
+		result: true
+	},
+	{
+		value: 'title',
+		result: true
+	},
+	{
+		value: 'tr',
+		result: true
+	},
+	{
+		value: 'track',
+		result: true
+	},
+	{
+		value: 'tt',
+		result: true
+	},
+	{
+		value: 'u',
+		result: true
+	},
+	{
+		value: 'ul',
+		result: true
+	},
+	{
+		value: 'var',
+		result: true
+	},
+	{
+		value: 'video',
+		result: true
+	},
+	{
+		value: 'wbr',
+		result: true
+	},
+	{
+		label: 'empty object',
+		value: EMPTY_OBJECT,
+		result: false
+	},
+	{
+		label: 'empty array',
+		value: EMPTY_ARRAY,
+		result: false
+	}
+];
+
+describe('isHtml5Tag', () => {
+	for (const testCase of TEST_CASES) {
+		const label = testCase.label ?? testCase.value;
+
+		it(`should return ${testCase.result} when input is ${label}`, () => {
+			const result = isHtml5Tag(testCase.value);
+
+			expect(result).toBe(testCase.result);
+		});
+	}
+});