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Fix in-* variant generating invalid CSS with relative arbitrary selectors #20424

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Fix in-* variant generating invalid CSS with relative arbitrary selectors #20424

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c0c6380
Fix `in-*` variant generating invalid CSS with relative arbitrary sel…
koreahghg Aug 20, 2026
e3b9179
Add PR link to changelog entry
koreahghg Aug 20, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -31,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Canonicalization: don't merge utilities that reference different theme variables set to CSS-wide keywords like `unset` ([#20417](https://github.com/tailwindlabs/tailwindcss/pull/20417))
- Don't generate utilities when a modifier is used that would otherwise be silently ignored (e.g. `rounded-sm/[5]`, `shadow-sm/foo`, `stroke-2/50`) ([#20419](https://github.com/tailwindlabs/tailwindcss/pull/20419))
- Only normalize top-level `and`, `or`, and `not` keywords in `supports-[…]` variants (e.g. `selector(a: not (.foo))` → `selector(a:not(.foo))`) ([#20420](https://github.com/tailwindlabs/tailwindcss/pull/20420))
- Don't generate invalid CSS for `in-*` variants using a relative arbitrary selector (e.g. `in-[>img]`), matching existing behavior for `not-*`, `group-*`, and `peer-*` ([#20424](https://github.com/tailwindlabs/tailwindcss/pull/20424))

## [4.3.3] - 2026-07-16

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4 changes: 4 additions & 0 deletions packages/tailwindcss/src/variants.test.ts
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Expand Up @@ -2000,6 +2000,10 @@ test('in', async () => {
"
`)
expect(await run(['in-p:flex', 'in-foo-bar:flex'])).toEqual('')

// `in-*` is built using `:where(…) &`, which — unlike `:has(…)` — does not
// accept relative selectors, so these must not generate any output.
expect(await run(['in-[>img]:flex', 'in-[+img]:flex', 'in-[~img]:flex'])).toEqual('')
})

test('has', async () => {
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2 changes: 2 additions & 0 deletions packages/tailwindcss/src/variants.ts
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Expand Up @@ -782,6 +782,8 @@ export function createVariants(theme: Theme): Variants {
staticVariant('inert', ['&:is([inert], [inert] *)'])

variants.compound('in', Compounds.StyleRules, (ruleNode, variant) => {
if (variant.variant.kind === 'arbitrary' && variant.variant.relative) return null

if (variant.modifier) return null

let didApply = false
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