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noUnknownUnit

src/content/docs/linter/rules/no-unknown-unit.mdx

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

<Tabs> <TabItem label="CSS" icon="seti:css"> ## Summary - Rule available since: `v1.8.0` - Diagnostic Category: [`lint/correctness/noUnknownUnit`](/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 [`unit-no-unknown`](https://github.com/stylelint/stylelint/blob/main/lib/rules/unit-no-unknown/README.md)

How to configure

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

Description

Disallow unknown CSS units.

For details on known CSS units, see the MDN web docs.

Examples

Invalid

css
a {
  width: 10pixels;
}
<pre class="language-text"><code class="language-text">code-block.css:2:12 <a href="https://biomejs.dev/linter/rules/no-unknown-unit">lint/correctness/noUnknownUnit</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Unexpected unknown unit: </span><span style="color: Tomato;"><strong>pixels</strong></span> <strong>1 │ </strong>a &#123; <strong><span style="color: Tomato;">&gt;</span></strong> <strong>2 │ </strong> width: 10pixels; <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>3 │ </strong>&#125; <strong>4 │ </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/Learn/CSS/Building_blocks/Values_and_units#lengths">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;">Use a known unit instead, such as:</span> - px - em - rem - etc. </code></pre>
css
a {
  width: calc(10px + 10pixels);
}
<pre class="language-text"><code class="language-text">code-block.css:2:24 <a href="https://biomejs.dev/linter/rules/no-unknown-unit">lint/correctness/noUnknownUnit</a> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: Tomato;">✖</span></strong> <span style="color: Tomato;">Unexpected unknown unit: </span><span style="color: Tomato;"><strong>pixels</strong></span> <strong>1 │ </strong>a &#123; <strong><span style="color: Tomato;">&gt;</span></strong> <strong>2 │ </strong> width: calc(10px + 10pixels); <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>3 │ </strong>&#125; <strong>4 │ </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/Learn/CSS/Building_blocks/Values_and_units#lengths">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;">Use a known unit instead, such as:</span> - px - em - rem - etc. </code></pre>

Valid

css
a {
  width: 10px;
}
css
a {
  width: 10Px;
}
css
a {
  width: 10pX;
}
css
a {
  width: calc(10px + 10px);
}
</TabItem> </Tabs>