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Ensure math operators are surrounded by whitespace in arbitrary values #20011

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Merged
RobinMalfait merged 3 commits into from
May 5, 2026
+13 −1
Merged

Ensure math operators are surrounded by whitespace in arbitrary values #20011

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31a18af
add failing test: ensure `+` in arbitrary value has whitespace
RobinMalfait May 5, 2026
d6ab294
ensure we add whitespace around operators in arbitrary values
RobinMalfait May 5, 2026
2ff732a
update changelog
RobinMalfait May 5, 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 @@ -30,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Export missing `PluginWithConfig` type from `tailwindcss/plugin` to fix errors when inferring plugin config types ([#19707](https://github.com/tailwindlabs/tailwindcss/pull/19707))
- Ensure `start` and `end` legacy utilities without values do not generate CSS ([#20003](https://github.com/tailwindlabs/tailwindcss/pull/20003))
- Ensure `--value(…)` is required in functional `@utility` definitions ([#20005](https://github.com/tailwindlabs/tailwindcss/pull/20005))
- Canonicalization: preserve required whitespace around operators in negated arbitrary values (e.g. `-left-[(var(--a)+var(--b))]`) ([#20011](https://github.com/tailwindlabs/tailwindcss/pull/20011))

## [4.2.4] - 2026-04-21

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7 changes: 7 additions & 0 deletions packages/tailwindcss/src/utilities.test.ts
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Expand Up @@ -1109,6 +1109,9 @@ test('left', async () => {
'left-4',
'-left-4',
'left-[4px]',

// https://github.com/tailwindlabs/tailwindcss/issues/20010
'-left-[(var(--my-var1)+var(--my-var2))]',
],
),
).toMatchInlineSnapshot(`
Expand All @@ -1121,6 +1124,10 @@ test('left', async () => {
left: calc(var(--spacing-4) * -1);
}

.-left-\\[\\(var\\(--my-var1\\)\\+var\\(--my-var2\\)\\)\\] {
left: calc((var(--my-var1) + var(--my-var2)) * -1);
}

.-left-full {
left: -100%;
}
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6 changes: 5 additions & 1 deletion packages/tailwindcss/src/utilities.ts
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Expand Up @@ -24,6 +24,7 @@ import {
isValidOpacityValue,
isValidSpacingMultiplier,
} from './utils/infer-data-type'
import { addWhitespaceAroundMathOperators } from './utils/math-operators'
import { replaceShadowColors } from './utils/replace-shadow-colors'
import { segment } from './utils/segment'
import * as ValueParser from './value-parser'
Expand Down Expand Up @@ -450,7 +451,10 @@ export function createUtilities(theme: Theme) {
if (value === null) return

// Negate the value if the candidate has a negative prefix.
return desc.handle(negative ? `calc(${value} * -1)` : value, dataType)
return desc.handle(
negative ? addWhitespaceAroundMathOperators(`calc(${value} * -1)`) : value,
dataType,
)
}
}

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