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noUnknownTypeSelector

src/content/docs/linter/rules/no-unknown-type-selector.mdx

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import { Tabs, TabItem } from '@astrojs/starlight/components';

<Tabs> <TabItem label="CSS" icon="seti:css"> ## Summary - Rule available since: `v1.9.4` - Diagnostic Category: [`lint/correctness/noUnknownTypeSelector`](/reference/diagnostics#diagnostic-category) - This rule is **recommended**, meaning it is enabled by default. - This rule doesn't have a fix. - The default severity of this rule is [**error**](/reference/diagnostics#error). - Sources: - Same as [`selector-type-no-unknown`](https://github.com/stylelint/stylelint/blob/main/lib/rules/selector-type-no-unknown/README.md)

How to configure

json
{
	"linter": {
		"rules": {
			"correctness": {
				"noUnknownTypeSelector": "error"
			}
		}
	}
}

Description

Disallow unknown type selectors.

This rule considers tags defined in the HTML, SVG, and MathML specifications to be known. For details on known CSS type selectors, see the following links

This rule allows custom elements.

Examples

Invalid

css
unknown {}
<pre class="language-text"><code class="language-text">code-block.css:1:1 <a href="https://biomejs.dev/linter/rules/no-unknown-type-selector">lint/correctness/noUnknownTypeSelector</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Unknown type selector is not allowed.</span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>unknown &#123;&#125; <strong> │ </strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">See </span><span style="color: lightgreen;"><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Type_selectors">MDN web docs</a></span><span style="color: lightgreen;"> for more details.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Consider replacing the unknown type selector with valid one.</span> </code></pre>
css
unknown > ul {}
<pre class="language-text"><code class="language-text">code-block.css:1:1 <a href="https://biomejs.dev/linter/rules/no-unknown-type-selector">lint/correctness/noUnknownTypeSelector</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Unknown type selector is not allowed.</span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>unknown &gt; ul &#123;&#125; <strong> │ </strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">See </span><span style="color: lightgreen;"><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Type_selectors">MDN web docs</a></span><span style="color: lightgreen;"> for more details.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Consider replacing the unknown type selector with valid one.</span> </code></pre>
css
x-Foo {}
<pre class="language-text"><code class="language-text">code-block.css:1:1 <a href="https://biomejs.dev/linter/rules/no-unknown-type-selector">lint/correctness/noUnknownTypeSelector</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Unknown type selector is not allowed.</span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>x-Foo &#123;&#125; <strong> │ </strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">See </span><span style="color: lightgreen;"><a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Type_selectors">MDN web docs</a></span><span style="color: lightgreen;"> for more details.</span> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Consider replacing the unknown type selector with valid one.</span> </code></pre>

Valid

css
input {}
css
ul > li {}
css
x-foo {}
</TabItem> </Tabs>