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44 lines
794 B
Markdown
44 lines
794 B
Markdown
# length-zero-no-unit
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Disallow units for zero lengths.
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```css
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a { top: 0px; }
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/** ↑↑
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* This zero and this type of length unit */
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```
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*Lengths* refer to distance measurements. A length is a *dimension*, which is a *number* immediately followed by a *unit identifier*. However, for zero lengths the unit identifier is optional. The length units are: `em`, `ex`, `ch`, `vw`, `vh`, `cm`, `mm`, `in`, `pt`, `pc`, `px`, `rem`, `vmin`, and `vmax`.
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## Options
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### `true`
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The following patterns are considered warnings:
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```css
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a { top: 0px }
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```
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```css
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a { top: 0.000em }
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```
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The following patterns are *not* considered warnings:
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```css
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a { top: 0 } /* no unit */
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```
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```css
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a { transition-delay: 0s; } /* dimension */
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```
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```css
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a { top: 2in; }
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```
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```css
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a { top: 1.001vh }
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```
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