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Media queries now accept the Media Queries Level 4 range syntax: `(width >= 600px)`, `(600px < width)` and `(400px <= width < 700px)`. Tailwind v4 and Bootstrap 6 write every breakpoint this way, so until now none of their responsive variants applied: the query failed to parse and never matched. `rem` and `em` in a media query are the initial font size, 16, as in CSS, so Tailwind's `(width >= 48rem)` is 768. They were read as plain numbers before (48). Lengths otherwise keep their meaning: `px` is a device pixel and a number without a unit is a device-independent pixel.
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PR Checklist
What is the current behavior?
min-/max-prefix syntax. Tailwind v4 and Bootstrap 6 write every breakpoint in the Media Queries Level 4 range syntax (@media (width >= 40rem)), which fails to parse, so none of their responsive variants (sm:,md:,.col-md-6) ever apply.remandemin a media query are read as plain numbers:(min-width: 48rem)is 48.What is the new behavior?
(width >= 600px),(600px < width),(400px <= width < 700px)and(700px > width >= 400px), combined with media types,and,notand lists as before. Malformed ranges still throw.remandemare the initial font size, 16, as in CSS. Tailwind'smdbreakpoint(width >= 48rem)is 768.pxis a device pixel, and a number without a unit is a device-independent pixel. (In CSS a media querypxis a CSS pixel; changing that would change which queries existing apps match, so it is left for a separate discussion.)Tests:
css-mediaquery/index.spec.ts(6) and a stylesheet-level case incss-selector.spec.ts.Verified with all of these core PRs merged together (#11527–#11537):
apps/automatedpasses on the iOS 26.4 simulator (1830 OK, 0 failed) and on an Android API 36 emulator (1692 OK; the one failure is the network-dependentIMAGE-CACHE.test_ImageCache_ValidUrltimeout, which also passes on reruns).