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67 lines
1.6 KiB
Markdown
67 lines
1.6 KiB
Markdown
# function-linear-gradient-no-nonstandard-direction
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Disallow direction values in `linear-gradient()` calls that are not valid according to the
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[standard syntax](https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient#Syntax).
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```css
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.foo { background: linear-gradient(to top, #fff, #000); }
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/** ↑
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* This (optional) first argument is the "direction" */
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```
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A valid and standard direction value is one of the following:
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- an angle
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- `to ` plus a side-or-corner (`to top`, `to bottom`, `to left`, `to right`; `to top right`, `to right top`, `to bottom left`, etc.)
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A common mistake (matching outdated non-standard syntax) is to use just a side-or-corner without the preceding `to`.
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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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.foo { background: linear-gradient(top, #fff, #000); }
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```
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```css
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.foo { background: linear-gradient(bottom, #fff, #000); }
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```
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```css
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.foo { background: linear-gradient(left, #fff, #000); }
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```
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```css
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.foo { background: linear-gradient(45, #fff, #000); }
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```
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```css
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.foo { background: linear-gradient(to top top, #fff, #000); }
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```
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The following patterns are *not* considered warnings:
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```css
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.foo { background: linear-gradient(to top, #fff, #000); }
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```
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```css
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.foo { background: linear-gradient(to bottom right, #fff, #000); }
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```
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```css
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.foo { background: linear-gradient(45deg, #fff, #000); }
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```
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```css
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.foo { background: linear-gradient(1.57rad, #fff, #000); }
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```
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```css
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/* Direction defaults to "to bottom" */
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.foo { background: linear-gradient(#fff, #000); }
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```
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