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Ensure --alpha(…) is seen as a color, and --spacing(…) is seen as a length #20260

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Merged
RobinMalfait merged 5 commits into from
Jun 18, 2026
+14 −2
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Ensure --alpha(…) is seen as a color, and --spacing(…) is seen as a length #20260

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0f2bb32
add failing test
RobinMalfait Jun 18, 2026
edf5d88
mark `--alpha(…)` as a color function
RobinMalfait Jun 18, 2026
1f6d693
mark `--spacing` as a length function
RobinMalfait Jun 18, 2026
e236f8f
use dedicated IS_LENGTH_FN check
RobinMalfait Jun 18, 2026
bbd9e63
update changelog
RobinMalfait Jun 18, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Ensure `@tailwindcss/cli` in `--watch` mode rebuilds when the input CSS file changes in an ignored directory ([#20246](https://github.com/tailwindlabs/tailwindcss/pull/20246))
- Ensure `@variant` rules generated by `addBase` can use custom variants defined later ([#20247](https://github.com/tailwindlabs/tailwindcss/pull/20247))
- Ensure `@tailwindcss/vite` doesn't crash during HMR when scanned files or directories are deleted ([#20259](https://github.com/tailwindlabs/tailwindcss/pull/20259))
- Ensure `text-[--spacing(…)]` generates `font-size` instead of `color` ([#20260](https://github.com/tailwindlabs/tailwindcss/pull/20260))

## [4.3.1] - 2026-06-12

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10 changes: 10 additions & 0 deletions packages/tailwindcss/src/utilities.test.ts
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Expand Up @@ -26518,6 +26518,7 @@ test('text', async () => {
'text-[color:var(--my-color)]/50',
'text-[color:var(--my-color)]/[0.5]',
'text-[color:var(--my-color)]/[50%]',
'text-[--alpha(red/20%)]',

// font-size / line-height / letter-spacing / font-weight
'text-sm',
Expand All @@ -26543,6 +26544,7 @@ test('text', async () => {
'text-[clamp(1rem,2rem,3rem)]',
'text-[clamp(1rem,var(--size),3rem)]',
'text-[clamp(1rem,var(--size),3rem)]/9',
'text-[--spacing(2)]',
],
css`
@theme {
Expand Down Expand Up @@ -26632,6 +26634,10 @@ test('text', async () => {
line-height: var(--leading-snug);
}

.text-\\[--spacing\\(2\\)\\] {
font-size: calc(var(--spacing) * 2);
}

.text-\\[12px\\] {
font-size: 12px;
}
Expand Down Expand Up @@ -26672,6 +26678,10 @@ test('text', async () => {
color: oklab(59.9824% -.067 -.124 / .5);
}

.text-\\[--alpha\\(red\\/20\\%\\)\\] {
color: oklab(62.7955% .224 .125 / .2);
}

.text-\\[color\\:var\\(--my-color\\)\\], .text-\\[color\\:var\\(--my-color\\)\\]\\/50 {
color: var(--my-color);
}
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3 changes: 2 additions & 1 deletion packages/tailwindcss/src/utils/infer-data-type.ts
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Expand Up @@ -232,9 +232,10 @@ const LENGTH_UNITS = [
]

const IS_LENGTH = new RegExp(`^${HAS_NUMBER.source}(${LENGTH_UNITS.join('|')})$`)
const IS_LENGTH_FN = /^(--spacing)\(/i

export function isLength(value: string): boolean {
return IS_LENGTH.test(value) || hasMathFn(value)
return IS_LENGTH.test(value) || IS_LENGTH_FN.test(value) || hasMathFn(value)
}

/* -------------------------------------------------------------------------- */
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2 changes: 1 addition & 1 deletion packages/tailwindcss/src/utils/is-color.ts
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Expand Up @@ -195,7 +195,7 @@ const NAMED_COLORS = new Set([
'accentcolortext',
])

const IS_COLOR_FN = /^(rgba?|hsla?|hwb|color|(ok)?(lab|lch)|light-dark|color-mix)\(/i
const IS_COLOR_FN = /^(rgba?|hsla?|hwb|color|(ok)?(lab|lch)|light-dark|color-mix|--alpha)\(/i

export function isColor(value: string): boolean {
return (
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