css: lower strict media range bounds with `not all and` or a .02px step by robobun · Pull Request #46806 · oven-sh/bun

robobun · 2026-10-24T20:32:01Z

Problem

A default bun build prints @media (width < 1280px) as @media (max-width: 1280px), the bytes of (width <= 1280px). Chrome applies both rules at 1280px. A strict rem bound prints a calc() that Chromium before 104 rejects.
write_min_max (src/css/media_query.rs:1200) keeps a strict bound only as a .001 step. The printer drops it from 1000px. Blink gives min-/max- lengths 1/64px of slack.

Fix

A query that is one strict bound prints as not all and (min-width: 1280px). A lone not (..) prints as not all and (..).
Any other strict length steps by .02px: screen and (max-width: 1279.98px). A lowered ratio prints two integer terms.
Verified: test/js/bun/css/css.test.ts (76 new tests fail on main), test/bundler/esbuild/css.test.ts. In Chromium 103, 106 and Chrome 153, wrong cells go from 208/112/56 to 56/0/0.
Self-reviewed: 26 concerns raised, 25 addressed. Not done: tracking issues for the limits.

Background

Range syntax needs Chrome 104 or Safari 16.4. The default targets (Chrome 80, Safari 14) get inclusive min-/max- features.
Those browsers negate only a whole query. They reject the not (min-width: V) of lightningcss and esbuild (Media query range syntax transpilation doesn't work for iOS <=16.3 parcel-bundler/lightningcss#1361).
.02px is Bootstrap's breakpoint-max step. Considered nested @media rules (exact, +783 lines) and the range as written (Chrome before 104 skips it).

Downsides

It has an effect only while the default targets stay below Chrome 104 / Safari 16.4. css: bump the default browser targets to Vite's baseline widely available set #40369 raises them, so that decision comes first.
A compound strict bound stays approximate (limits in Notes).
+12 bytes per lone strict bound. Up to +38 instructions per printed @media rule.

Notes

Decisions for a maintainer

No maintainer has looked at these yet. The first review round came from CodeRabbit and claude[bot].

The default targets. css: bump the default browser targets to Vite's baseline widely available set #40369 raises them to Chrome 111 / Safari 16.4. At those targets main and this branch print the same bytes (102 queries of the test tables compared). The code then runs only for explicit older targets (Bun.build: add cssTarget option to set CSS browser targets #40368). css/MediaRangeStrictBound/{cli,api} in test/bundler/esbuild/css.test.ts expects the lowered output of a default build, so the PR that lands second must change that test.
The form of a compound strict bound. This PR steps a length by .02px. The alternatives are nested @media rules (exact in every browser, branch robobun/f87d6b66/css-media-range-nested-rules, +783/-138 lines in src/css) and the range as written (the first push: Chrome before 104 and Safari before 16.4 skip the rule, where main's output applies).
The lone not (feature) form for a plain or boolean feature, for example not (hover). It changes bytes for input with no range in it. @tailwindcss/node 4.3.3 does the same rewrite in its optimize step. It can move to its own PR.

No Bun user reported the bug. The upstream reports are parcel-bundler/lightningcss#228 and parcel-bundler/lightningcss#864. lightningcss 7f29035 deleted the .001 step for them.

Before and after

bun build, default targets:

Source	main (`179664e`)	This branch
`(width < 768px)`	`(max-width: 767.999px)`	`not all and (min-width: 768px)`
`(width < 1280px)`	`(max-width: 1280px)`	`not all and (min-width: 1280px)`
`(width > 1024px)`	`(min-width: 1024px)`	`not all and (max-width: 1024px)`
`(width < 64rem)`	`(max-width: calc(64rem - .001px))`	`not all and (min-width: 64rem)`
`(width < env(x))`	`(max-width: env(x))`	`not all and (min-width: env(x))`
`only all and (width < 768px)`	`only all and (max-width: 767.999px)`	`not all and (min-width: 768px)`
`not (width < 1024px)`	`not (max-width: 1024px)`	`(min-width: 1024px)`
`not (width >= 48rem)`	`not (min-width: 48rem)`	`not all and (min-width: 48rem)`
`not (hover)`	`not (hover)`	`not all and (hover)`
`screen and (width < 768px)`	`screen and (max-width: 767.999px)`	`screen and (max-width: 767.98px)`
`screen and (width < 1024px)`	`screen and (max-width: 1024px)`	`screen and (max-width: 1023.98px)`
`(600px < width < 1024px)`	`(min-width: 600.001px) and (max-width: 1024px)`	`(min-width: 600.02px) and (max-width: 1023.98px)`
`screen and (width < 64rem)`	`screen and (max-width: calc(64rem - .001px))`	`screen and (max-width: calc(64rem - .02px))`
`(min-aspect-ratio: 1/1)`	`(min-aspect-ratio: 1)`	`(min-aspect-ratio: 1 / 1)`
`screen and (aspect-ratio > 16/9)`	`screen and (min-aspect-ratio: 16.001 / 9)`	`screen and (min-aspect-ratio: 16001 / 9000)`
`(resolution > 2dppx)`	`(min-resolution: 2.001dppx)`	`(min-resolution: 2.001dppx)`
`(color > 2)`	`(min-color: 3)`	`(min-color: 3)`

Tailwind 4.3.3 emits @media (width < 48rem) for max-md: and @media not (width >= 48rem) for not-md:. It nests the rules of stacked variants (md:max-lg:), so each query is one bound and prints exact.

Which builds this changes

The lowering runs where the CSS printer has browser targets: bun build ./index.html and Bun.build with target: "browser". A bun build --target=bun of a server file that imports an HTML file prints the ranges as written, on main and on this branch, because the linker prints that CSS with the targets of the server build.

The .02px step

Blink's CompareDoubleValue (media_query_evaluator.cc) compares >= and <= with LayoutUnit::Epsilon(), which is 1/64px. Only lengths go through it. The same code is in 106.0.5249.119 and on main.
Measured with matchMedia in Chromium 103, 106 and Chrome 153: (max-width: 767.999px), (max-width: 767.99px) and (max-width: 767.985px) match at 768px. (max-width: 767.98px) does not. (min-width: 768.02px) does not match at 768px.
Bootstrap's breakpoint-max subtracts the same .02px (_breakpoints.scss).
In Chromium the wrong band is the .005px below the bound: (max-width: 767.98px) holds up to 767.9956px.

Ratios

Chrome before 110 reads a ratio only as <integer> / <integer> (media_query_exp.cc at 109). Safari before 16.4 has the same grammar (MediaQueryExpression.cpp, safari-7614-branch).
Measured: (min-aspect-ratio: 1) is not all in Chromium 103 and never matches in 106. (min-aspect-ratio: 1 / 1) is right in 103, 106 and 153.
write_min_max now prints both terms. A strict bound with integer terms steps by one on the numerator after both terms are scaled to at most 5 digits: 16 / 9 becomes 16001 / 9000. Safari before 16.4 multiplies a term by the viewport size as a 32-bit float, which sets that limit.

Limits

A compound strict length is approximate: a viewport width within .02px below the bound is on the wrong side.
A compound strict bound in rem, em or vw prints a mixed-unit calc(), as before. Chromium before 104 rejects it (measured in 103).
Safari 14.0 and 14.1 read a media length as an integer (computeLength<int> in MediaQueryEvaluator.cpp, safari-610-branch and safari-611-branch, fixed by bug 224097). There a compound > bound stays inclusive, as on main. A lone < bound with a fraction, for example (width < 767.5px), does not apply at 767px there, where main's form does.
The printer keeps 6 digits. The step is lost for a length from 10000px, and for a resolution or number bound from 1000, as before.
A ratio term that is not an integer keeps the .001 step. A plain (aspect-ratio: 1/1) prints 1, as before.
A not (..) inside a compound query, not of a group, and or print with Media Queries 4 syntax, as before. screen and (not (width > 1024px)) has an exact old form, screen and (max-width: 1024px), which this PR does not print.
A strict resolution bound and a resolution query under not all and print main's bytes. Safari before 16 reads the feature and never matches it (resolutionEvaluate, safari-610-branch), so a not all and that is added or removed changes the result there.
@custom-media rules print without the lone forms. (--name) puts that query inside other queries, where a not all and negates those too.
For targets with range syntax and no interval syntax (Firefox 63 to 101 alone), a strict interval bound still steps.

Measurements

Release builds of the merge base 179664e and of this branch.

Chromium: real output of both builds, loaded as stylesheets at 9 viewport widths, 86 shapes, 774 cells. Truth is the source query in Chrome 153.

Wrong cells Chromium 103 Chromium 106 Chrome 153

main 208 112 56

This branch 56 0 0

Right on main, wrong on this branch 0 0 0

The 56 cells left in Chromium 103 are wrong on main too: 42 in 6 shapes whose source has an or or an inner not, 14 in 2 shapes with a mixed-unit calc().
WebKit: the review ran 76 of those shapes in eight Playwright WebKit builds (UA Version 14.2 to 17.4) on the previous commit. Wrong cells on main: 160, 140, 116, 116, 116, 116, 43, 43. On the branch: 69, 59, 34, 34, 34, 34, 0, 0. No cell was worse. A second set of 69 shapes found 18 worse cells in the two oldest builds, all in not all and (resolution > V). 06f7db4 prints main's bytes for that query again. Safari itself and Gecko were not run.
Instructions per printed rule with no strict bound (gdb single-step, two identical runs per binary, allocator internals not counted): +29 to +36 for (min-width:768px), +13 to +27 for two features, +0 to +14 for screen and three features, +12 for @media print, +6 to +13 for an @import with a media query. The higher number is with the default targets. not (hover): +60 with no targets, +135 with range-syntax targets, +150 with the default targets. +0 allocations, +0 per Printer.
Allocator calls per lone strict rem bound: 0 more than a rule with no strict bound (main 18 more). Per lone strict calc() bound: 0 more (main 36 more).
Outputs for input with no strict bound: 56 of 56 corpus builds are identical (36 tracked .css files, plain and --minify, the other 16 fail on both). 57 of 60 hand cases are identical. The other 3 are not (hover), (min-aspect-ratio: 2/1) and (aspect-ratio >= 1) for Safari 14.
Release binary .text: +1,792 bytes (llvm-size -A). No field added to Printer.
Minified bytes per rule, 1,000 rules per fixture: +12.0 for a lone px bound from 1000px, +8.4 below 1000px, -3.0 for a lone rem bound, +3.0 for screen and (width < Npx) from 1000px, +4.0 for a both-strict interval.

Nested @media rules give exact output for compound queries. The branch named above has an earlier build. Its path for a list with two such queries writes the block twice, which changes the cascade when the block holds an anonymous @layer. That path must go before the branch is used.
css: write the -webkit-/-moz- device-pixel-ratio queries for resolution media features #45946 adds -webkit-/-moz- device-pixel-ratio queries in the same file. One of its expectations is not (-webkit-min-device-pixel-ratio: 2), not (min-resolution: 2dppx) for Safari 15. With this branch the first query prints not all and (-webkit-min-device-pixel-ratio: 2). The PR that lands second updates that expectation.
css: print the = comparison in media and container queries as = #45071 changes the = comparison, which prints as (width-1024px) for targets with range syntax.
<link rel="stylesheet" media=".."> conditions do not reach this printer (Handling of media="print" incorrectly #18526).

Test runs

test/js/bun/css/css.test.ts: 1431 pass, 0 fail on the debug build. On a release build of the merge base 82 fail: 76 of the 116 new tests and 6 older tests whose expectations changed. The other 40 new tests are controls.
test/bundler/esbuild/css.test.ts: 59 pass, 1 todo. Both css/MediaRangeStrictBound tests fail on the merge base.
test/bundler/css/: 184 pass.
test/js/bun/css/ (20 files) and test/internal/source-lints/: 2640 and 183 pass on the release build of this branch.

….001px offset For targets without media range syntax, (width < V) was printed as (max-width: V - .001). The number printer keeps 6 significant digits, so from 1000px the offset was lost and the bound became inclusive. Chromium compares min-/max- lengths with 1/64px of slack, so the offset did nothing there at any size. A query that is one strict bound is now the negation of the opposite inclusive feature, with the value as written: (width < V) is "not all and (min-width: V)". "not (width < V)" is "(min-width: V)", and "not (width >= V)" is "not all and (min-width: V)". Browsers without range syntax negate only a whole query. A strict bound beside a media type or another condition has no such form and stays a range. So does a strict resolution bound, and every bound of a @Custom-Media rule. An integer bound keeps its exact inclusive neighbour through a checked step. The old step overflowed at i32::MAX.

robobun · 2026-10-24T20:32:16Z

^{Updated 12:03 AM PT - Oct 25th, 2026}

✅ @robobun, your commit f5577fc9b3d6525611b5eafd95139dcbb5764aca passed in Build #132437! 🎉

🧪 To try this PR locally:

bunx bun-pr 46806

That installs a local version of the PR into your bun-46806 executable, so you can run:

bun-46806 --bun

robobun · 2026-10-24T20:32:22Z

Status

Reproduced on main (179664e) and on bun 1.4.3:

printf '@media (width < 768px){a{color:red}}\n@media (width < 1280px){b{color:red}}\n@media (width > 1024px){c{color:red}}\n@media screen and (width < 1024px){d{color:red}}' > b.css
bun build b.css --outdir=o --minify && cat o/b.css

Before:

@media (max-width:767.999px){a{color:red}}@media (max-width:1280px){b{color:red}}@media (min-width:1024px){c{color:red}}@media screen and (max-width:1024px){d{color:red}}

On main at 7942008:

@media (max-width:767.98px){a{color:red}}@media (max-width:1279.98px){b{color:red}}@media (min-width:1024.02px){c{color:red}}@media screen and (max-width:1023.98px){d{color:red}}

The .02px step of this PR landed in #47025. This PR is closed.

coderabbitai · 2026-10-24T20:38:18Z

Walkthrough

CSS media-query serialization now lowers eligible standalone strict bounds for targets without range syntax. Other query forms remain in range syntax when they cannot be lowered. Tests and documentation cover the conversion and its limits.

Changes

Media range compatibility

Layer / File(s)	Summary
Legacy bound serialization `src/css/media_query.rs`, `src/css/values/length.rs`, `src/css/values/ratio.rs`, `src/css/values/resolution.rs`	Strict comparisons now use inclusive legacy bounds where supported, with checked integer adjustments and negation as a fallback. Ratio serialization can write both terms. Several numeric adjustment helpers were removed.
Lone range lowering `src/css/media_query.rs`, `src/css/rules/custom_media.rs`	Media-list serialization lowers eligible standalone strict ranges for targets without range syntax. Custom media queries use serialization without lowering.
Compatibility tests and documentation `test/js/bun/css/css.test.ts`, `test/bundler/esbuild/css.test.ts`, `docs/bundler/css.mdx`	Tests cover browser-target output, bundled CSS, query lists, and cases that remain in range syntax. Documentation describes exclusive-bound conversion and when older browsers skip a query.

Suggested reviewers: jarred-sumner

Priority: Normal

Merge Risk: Moderate · up to 20157

Compound media queries with a strict bound (for example screen and (width < 768px)) are now emitted in range syntax. Browsers without range syntax, such as Safari 14 to 16.3 and Chrome before 104, skip those rules, and Bun gives no warning. The PR documents this, but under default targets it can silently drop CSS. Decide before merging whether to accept this or add a fallback or warning.

Pre-merge checks: 4

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly summarizes the main change: lowering strict media range bounds with negated inclusive bounds or a .02px step.
Description check		The description clearly explains the problem, the fix, limitations, design decisions, and verification results. It does not use the template headings exactly, but it provides the required information …

Full details: Description check

Explanation

The description clearly explains the problem, the fix, limitations, design decisions, and verification results. It does not use the template headings exactly, but it provides the required information in equivalent sections.

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Inline comments:
Review comments at @src/css/media_query.rs:
- Around line 1271-1275: Update the LegacyComparison::IsNot serialization path
to warn when it emits strict range syntax for a configured target that lacks
MediaRangeSyntax. Preserve the current serialized output and limit the warning
to affected targets.

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Source mode: Auto
Repository: oven-sh/bun
Branch: robobun/f87d6b66/css-media-range-strict-bound
File: .coderabbit.yaml
Commit: 201574b
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Commits

Reviewing files that changed from the base of the PR and between 179664e and 201574b.

Files selected for processing: 8

docs/bundler/css.mdx
src/css/media_query.rs
src/css/rules/custom_media.rs
src/css/values/length.rs
src/css/values/ratio.rs
src/css/values/resolution.rs
test/bundler/esbuild/css.test.ts
test/js/bun/css/css.test.ts

Files with no reviewable changes: 1

src/css/values/resolution.rs

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 0 remain after this review.

claude

Findings marked 🟡 are optional suggestions and need no follow-up push.

Additional findings (outside the current diff — GitHub can't attach inline comments there):

🟡 test/js/bun/css/css.test.ts — nit: a maintainer who un-skips this test gets an expectation that records the .001 offset this PR removes. The skipped case at test/js/bun/css/css.test.ts:6627-6644 still expects (-webkit-min-device-pixel-ratio: 2.001), (min-resolution: 2.001dppx) for (resolution > 2dppx). Fix: update the expectation to what the printer now emits for a strict resolution bound (the range is kept: (resolution > 2dppx) plus whatever device-pixel-ratio fallback that follow-up adds), or note in the skip why the old bytes are kept, so the suite holds no assertion on the deleted offset.

Why this was flagged

The PR deletes MediaFeatureValue::add_f32 and the .001 nudge in write_min_max (src/css/media_query.rs:1217-1290), and to_css_without_range_syntax at src/css/media_query.rs:1369 keeps a strict resolution bound as range syntax. The skipped prefix_test at test/js/bun/css/css.test.ts:6627-6644 (fourth argument true means test.skip per test/js/bun/css/util.ts:56-57) still asserts 2.001 for input (resolution > 2dppx) with safari 15. On the base branch that expectation matched the offset the printer produced; after this PR no code path can emit 2.001, so the first un-skip (the pending device-pixel-ratio fallback work the PR notes mention) fails on the stale value rather than on the fallback itself. A grep for \.001 under test/ shows this is the only remaining assertion on the old behavior.

Verification: nit. Trigger: a maintainer un-skips the prefix_test at test/js/bun/css/css.test.ts:6627-6644. It still expects (-webkit-min-device-pixel-ratio: 2.001), (min-resolution: 2.001dppx) for (resolution > 2dppx). The PR removes the offset (src/css/media_query.rs:1363-1375) but left this skipped test recording it. Nothing breaks at runtime; the test is skipped on both base and head.
🟣 src/css/media_query.rs — pre-existing: users building for the default targets get @ media (aspect-ratio >= 1) and even hand-written (min-aspect-ratio: 1/1) printed as (min-aspect-ratio: 1), which Chrome 87-109 rejects, so the rule never applies. The diff adds the Chrome<110 both-terms workaround only in the lone-negation path at src/css/media_query.rs:1385, while src/css/media_query.rs:1114 still prints a ratio with denominator 1 as a bare number for every other media feature. Fix: when dest.targets lack MediaRangeSyntax, print every media-feature ratio with both terms at src/css/media_query.rs:1114 (via to_css_both_terms), which covers the 3 sites and lets the special arm at :1385 go. Same pattern at 3 sites (src/css/media_query.rs:1114, src/css/media_query.rs:1268, src/css/media_query.rs:902). [also at: src/css/media_query.rs:1268 - Pre-existing: a non-strict ratio bound still prints as a single number, which the new code's own comment says Chrome before 110 rejects. write_min_max at src/css/media_query.rs:1268 calls value.to_css for Is(bound, None), so (aspect-ratio >= 1) becomes (min-aspect-ratio: 1) while the lone strict path at src/css/media_query.rs:1385 writes 1 / 1.]

Why this was flagged

Input @ media (aspect-ratio >= 1) { ... } or the valid legacy form @ media (min-aspect-ratio: 1/1) { ... }, built with bun build for the browser target (default Chrome 87 / Safari 14, src/css/targets.rs:190-197). QueryFeature::to_css at src/css/media_query.rs:914 calls write_min_max, whose Is arm at src/css/media_query.rs:1268 calls value.to_css; MediaFeatureValue::to_css at src/css/media_query.rs:1114 calls Ratio::to_css, which at src/css/values/ratio.rs:39-42 drops the / 1 and prints (min-aspect-ratio: 1). Chrome before 110 rejects a single-number ratio in a media feature, so the whole query is not all and the rule never matches. The PR's own comment at src/css/media_query.rs:1383 states this browser fact. The base branch prints the same bytes, so this is pre-existing; the diff adds the workaround for only the lone-negation site at src/css/media_query.rs:1385, leaving the Plain (:902) and write_min_max (:1268) sites on the old behaviour.

Verification: pre-existing — the base branch prints the same bytes by the same route; the diff adds the Chrome<110 workaround on only one of the two sibling paths. The Is(bound, None) arm of write_min_max calls value.to_css(dest), which for MediaFeatureValue::Ratio calls ratio.to_css (src/css/media_query.rs:1114) and prints only the numerator when denominator == 1.0, so the output is (min-aspect-ratio: 1).

A strict bound that is not the whole query prints as a min-/max- feature again. Its length steps by .02px: Blink gives a min-/max- length 1/64px of slack, so the .001px step was inclusive there. A query that is not (..) of one feature of any kind prints as not all and (..). The only qualifier does not stop that form.

…ntegers A lone resolution query keeps its whole-query not, or its lack of one: Safari before 16 reads the feature and never matches it. A ratio in a lowered min-/max- feature prints both terms, and a stepped ratio keeps integer terms (16001 / 9000). Chrome before 110 and Safari before 16.4 read a ratio only as two integers. The negated form of a lone strict bound goes through write_min_max.

robobun · 2026-10-25T05:55:32Z

Two findings of the review were outside the diff.

The skipped (resolution > 2dppx) test in css.test.ts is right again. A strict resolution bound prints (min-resolution: 2.001dppx) as on main, so its expectation matches the printer.
The single-number ratio is fixed for lowered features in 06f7db4. write_min_max prints both terms, so (min-aspect-ratio: 1/1) and (aspect-ratio >= 1) print (min-aspect-ratio: 1 / 1) for targets without range syntax. Chromium 103 and 106 do not apply (min-aspect-ratio: 1), and they apply (min-aspect-ratio: 1 / 1) (measured). The special arm in the negated form is gone. A plain (aspect-ratio: 1/1) still prints 1. That path is the value printer for every target, and a fix there needs a version gate that compat.rs does not have. The description lists it under Limits.

claude

Code review completed

Nothing new to post: everything this review found is already covered by existing comments on this pull request or didn't merit a separate one.

@mikamikasuki

### What does this PR do? Consolidates the open pull requests on the CSS parser (`src/css`: parsing, minifying, lowering, printing, CSS modules) into one. 179 open pull requests were in scope. Each was judged by one rule: **the output must mean to a browser what the input meant.** Every claim was run through a build of `main`, a build with the change, lightningcss 1.33 and Chromium 156 (CSSOM, computed values, painted pixels for colors and gradients), and counted against 10,116 real stylesheets: the published CSS of about 190 popular npm packages, plus stylesheets from open source repositories. 107 land here, whole or in part, most of them cut down. The source diff is net negative. Of the 10,116, 9,509 are stylesheets that someone ships. The rest are test fixtures of other tools (521), Tailwind v4 source that needs its plugin (59) and SCSS, PostCSS or template source (27). | 9,509 shipped stylesheets | `main` | this branch | |---|---|---| | fail to build | 71 | 35 | | ... of those, valid CSS that Bun rejects | | 0 | | minified output reads differently in Chromium than the input | 552 | 2 | | CSS modules with a name that is referenced but not defined, or exported but not defined | 166 | 0 | | all 10,116 | `main` | this branch | |---|---|---| | fail to build | 192 | 141 | | minified output reads differently in Chromium than the input | 593 | 15 | | build on `main`, fail here | | 0 | | right on `main`, wrong here (minified, and at the default targets) | | 0 | | size of the minified output, no targets | 162.32 MB | 162.47 MB (+0.093%) | | size of the output at the default targets | 224.1 MB | 210.2 MB (-6.2%) | A syntax error is a build error, with one exception: the IE star hack `*zoom: 1` is skipped, because tachyons and handsontable ship it. The 35 shipped stylesheets that fail are invalid CSS: 28 have a selector that Chromium drops (semantic-ui-css, swiper, @ionic/core, Adobe Spectrum, xp.css), 2 an `@import` after other rules, and one each `@supports not X and Y`, a nested `@keyframes`, a stray comma, a selector list in `::slotted()`, `@media screen\0` (govuk-frontend). The 2 that read differently fold a `color-mix()` inside a gradient (see the known gaps). The growth of the minified output is rules and declarations that `main` deleted by mistake: 87 KB of rules, 45 KB of prefixed declarations that only browser targets can rule out. #### Popular CSS that `main` breaks today - normalize.css, modern-normalize, sanitize.css: `font-family: monospace, monospace` is collapsed to `monospace`, which changes the font size from 16px to 13px (#46662). - CKEditor 5, Tabler, Carbon, VitePress, Ionic, PatternFly, Excalidraw: a rule of custom properties is deleted as a "duplicate" of a later rule with the same selector and other custom properties. 37 stylesheets lose 1,681 custom properties (#33684). - Material Components, daisyUI, DocSearch, plyr: a `var()` size loses to its own fallback (#42101). - nextra, daisyUI, CKEditor: declarations written after a nested rule are moved above it (#45462). - antd 4, purecss, govuk-frontend: browser hacks in selector lists start to apply everywhere (#42100). - foundation-sites, flatpickr, 98.css, blueprintjs, scalar, react-datepicker: the build fails on valid CSS (#46756, #38552, #38534). tachyons, handsontable: it fails on the IE star hack (#46751). - nodejs.org, Mantine: a CSS module exports classes that no rule defines, because the `@apply` or `@mixin` in them is moved out of the rule (#46759). - hint.css and 42 more: `z-index: 1000001` and `1000000` become the same number (#46715). - Adobe Spectrum: `--version: 5.0.1` prints as `5.1`. - A quarter of all stylesheets: minified output has a stray space in `align-items: center` (#41993). #### Behavior changes to look at first 1. **`light-dark()` is kept as written at the default browser targets** (#42009). The lowered form `var(--buncss-light, a) var(--buncss-dark, b)` is invalid unless a compiled `color-scheme` covers the element: 184 of the 215 real stylesheets that get it never define the variable, so every browser drops the declaration. The docs section on the polyfill is removed. 2. **`border` is not built from longhands** (#42072): `border-width:0;border-style:solid;border-color:red` stays three declarations, because `border` also resets `border-image`. 305 real stylesheets grow by 30 KB in total; `bootstrap.min.css` by 113 bytes, 5 gzipped. No real stylesheet was found where the old merge shows, so this is the one to drop if size matters more. 14 existing expectations change. 3. **A CSS module no longer exports names that only occur inside `:global(...)`** (#45487). 73 real modules lose 202 export keys, all of them names that no rule has. `import { g }` or `composes: g` of such a name becomes a build error. 4. **Container names and `@counter-style` names stay global in a CSS module** (#45247 by @mikamikasuki). `main` hashes the `@container` name but not `container-name`, so a named query never matches. postcss-modules (Vite, css-loader, Next.js) keeps them global; lightningcss and esbuild hash both. Global keeps a container that is queried from another file or from JS working. 5. **Syntax errors are build errors, also two that `main` lets through**: a media query that stops short (`@media screen and {`, `@media not {`, `@import "a.css" screen and;`) and `@media (width <) foo {`. No stylesheet of the 10,116 has either. A condition that is valid by the grammar though no browser knows it, `( ... )` or `fn( ... )`, is kept as written (#46756): `(min-width:0\0)`, `(not(hover))`. 6. **Declarations after a nested rule stay where they were written**, as a nested declarations rule (#45462). Changes the output of 199 real stylesheets; in a fuzz of 2,850 nested programs compared by computed style, `main` was wrong in 1,056 and the pull request's code, before it was trimmed here, in none. 7. **`Bun.color`**: `color()` inputs are converted instead of returned as a string (`Bun.color("color(srgb 1 0 0)", "hex")` was `"color(srgb 1 0 0)"`); `currentColor`, system colors and `light-dark()` give `null` in the converting formats instead of the keyword as a string; a relative color or `color-mix()` outside sRGB is clipped, not gamut-mapped (`hsl(from oklch(100% .399 336.3) h s l)` is `#ff5bff`, was `#fff`). 8. The `:-moz-any()` and `:-webkit-any()` copies of rules with `:is()` are gone at the default targets (#45945, #42029). The `:-webkit-any()` copy outranked the original rule: `.title{color:blue} :is(h1,h2,h3){color:red}` painted red. 5.8% of all default-target output was the `:-moz-any()` copies. 9. `Property` grows from 216 to 224 bytes: `Url` stores its text as a slice so that two `url()` values can be compared (#46895). The pull request packed a pointer and a `u32` behind `unsafe` to avoid that. #### Not in this PR, needs a decision - **Raise the default browser targets (#40369) and add a `cssTarget` option (#40368).** Today: Chrome 80, Edge 80, Firefox 78, Safari 14, Opera 67, and no public way to change them. At Vite 8's floor the output of the 9,924 stylesheets is 15.3% smaller (3.9% gzipped). About a dozen fixes here only matter at today's floor, and code for older targets is unreachable without the option. - Vendor prefixes for `user-select`, `appearance`, `hyphens` and five more (#45814): 1,116 real stylesheets lack a prefix they need at the default targets. And for `backdrop-filter` (#44648): 173. - Clip instead of gamut-map in the sRGB fallback of a plain wide-gamut color: deletes about 90 lines, changes every pinned fallback hex. If the mapping stays, #44647 by @oddharsh makes it closer to what browsers paint (colors off by 2/255 or more: 168 to 110 of 3,170 real ones). #### Changes **Rules: duplicates, merging, nesting, fallbacks** - The `:-moz-any()` copy of every rule with `:is()` or `:not(a, b)` is gone: Firefox 78 has `:is()` (#45945). 1,164 real stylesheets - Keep declarations written after a nested rule in place with a nested declarations rule (#45462). 379 real stylesheets - With nesting compiled away, an unknown at-rule inside a style rule was moved out of it: `.wrapper{@apply flex}` printed a bare `@apply flex;` and the rule was gone, so a CSS module exported a class that no rule defines. It now stays in a block under the compiled selector. 72 real modules with Tailwind's `@apply`, 25 with Mantine's `@mixin` (#46759). 316 real stylesheets - Keep !important in the rules generated for logical properties and color-scheme (#38597). 311 real stylesheets - With browser targets, remove an earlier duplicate rule only when its declaration block is equal (#46861). 171 real stylesheets - Compare custom property names in `PropertyId` equality and importance in duplicate-rule detection (#33684). 40 real stylesheets - Keep same-condition @supports rules and empty named @layer blocks (#46733). 31 real stylesheets - Keep target-added vendor prefix passes on cloned and re-minified rules, and never print a bare `:full-screen` (#43339). 12 real stylesheets - Keep the selectors on rules added for color fallbacks and logical properties (#43240). 3 real stylesheets - A later declaration of a property drops the `@supports` color copies of the earlier one, which printed after the rule and won (#45560). 2 real stylesheets - Do not merge style rules in a stylesheet that holds `revert-rule` (#46953). 1 real stylesheets - `@import ... supports(-webkit-mask: none)` kept its prefix (#38589) **Properties and shorthands** - Print align-items:center without a stray space when no safe/unsafe keyword is given (#41993). 3,317 real stylesheets - Emit the physical longhands instead of the inset shorthand for targets without it (#38583). 1,452 real stylesheets - Keep the stops of an upward gradient as written, and drop a `50%` hint only at the midpoint (#46790). 104 real stylesheets - Emit unparsed border-block-* declarations when compiling logical borders (#38582). 89 real stylesheets - Keep repeated font families and dedupe only the inserted system-ui fallbacks (#46662). 88 real stylesheets - A `width` / `height` / `min-*` / `max-*` with `var()` or `env()` was printed before the plain fallback written above it, so the fallback won (#42101). 26 real stylesheets - Keep box-orient and box-direction when flex-direction or flex-flow follows (#45672). 16 real stylesheets - Write held prefixed background declarations at every flush (#46882). 6 real stylesheets - Derive equality for Size2D and BorderRadius, and keep every prefix in the border-radius handler (#45665). 2 real stylesheets - Print `none` instead of an empty border-image, mask-border or mask-box-image value (#45143). 2 real stylesheets - Keep font/transition sub-properties on the side of the shorthand they were written on (#41990). 2 real stylesheets - CSS-wide keywords are not names: `font:12px Arial;font-family:inherit` printed `font:12px inherit`, `color-scheme:inherit` and `color-scheme:auto` printed `normal`, `transition-property:unset` was folded into `transition` (#42022). 2 real stylesheets - Only fold font longhands into `font` when the rule declared a `font` (#45459) - Keep a font family name quoted when its identifiers do not read back as the same name (#46606) - Stop rewriting valid positions into ones browsers reject (#45197) - `border` is no longer built from longhands unless the rule also sets what `border` resets (`border-image`), and an author's `border-image` reset is no longer dropped. `transition` is likewise only written where the rule wrote one, because it resets `transition-behavior` (#42072) - `border; border-image: <gradient>; border-image-slice: 1` lost the gradient in every default build (#42018) - A prefixed `linear-gradient` keeps its direction, written or generated: the prefixed syntax names the starting side and measures angles differently (#46697) **At-rules** - Print @font-face format() keywords as strings (#37979). 439 real stylesheets - Print @supports `not` conditions without a leading space (#38559). 88 real stylesheets - Reset after the number token of a unicode-range (#45835). 33 real stylesheets - Keep `<general-enclosed>` media and container conditions as written (#46756). 24 real stylesheets - A strict range such as `(width < 768px)` lowered for old targets still matched at exactly 768px. The step is now `.02px`. The `not all and` form for other units is not taken (#46806). 18 real stylesheets - Keep scanning an @supports condition after a nested block (#38552). 9 real stylesheets - Every `@counter-style name` printed as `@counter-stylename`, which browsers drop (also #46692). In a CSS module the name now stays global, like the `list-style` that refers to it (#33679). 9 real stylesheets - Keep a keyframe whose block has an invalid item (#46288). 2 real stylesheets - Read an @Property initial-value on the stylesheet's parser, keep an unmatched value as written (#45806). 2 real stylesheets - `@media {}` is `all`. A media query that stops after `and`, `or` or `not` (`@media screen and {`) is a build error; `main` printed `not all` or dropped the condition, silently. The `@layer` and type selector parts are not taken (#46869). 2 real stylesheets - Accept a name-only `@container` and a `style()` feature with no value (#46689). 1 real stylesheets - Parse `<timeline-range-name> <percentage>` keyframe selectors (#45652) - Allow `or` inside parentheses after a media type (#45088) - Print the `=` comparison in media and container queries as `=` (#45071) - Parse the @font-palette-values font-family descriptor as a list of family names (#45484) **Selectors** - Never wrap a selector list in :is() (#46787). 414 real stylesheets - Stop emitting :-webkit-any() copies of :is() that outrank the original rule (#42029). 373 real stylesheets - With browser targets, a selector list with a vendor-prefixed member was split, which revives hacks that rely on other engines dropping the whole list: `.s *::-ms-backdrop,.s{flex:auto}` applied everywhere. Rewritten; the list is printed as written (#42100). 42 real stylesheets - Print the vendor prefix on downleveled :any-link, :read-only, :read-write, :placeholder-shown and :autofill (#42131). 12 real stylesheets - Fix nesting lowering of a `&` that does not lead its selector (#43047). 8 real stylesheets - `@scope`: `&` and implicit selectors compile to `:where(:scope)`, relative selectors and bare declarations parse (#43165). 7 real stylesheets - Only reject bare :global / :local pseudo-classes in CSS modules (#38534). 5 real stylesheets - Stop truncating `@scope to (...)` and stop replacing `&` in the scope-end selector (#43146). 2 real stylesheets - `[xl|href$=".pdf"]` lost its namespace prefix (#45159). 2 real stylesheets - Match An+B keywords exactly and take only `+` as the leading sign (#42953). 1 real stylesheets - Parse ::details-content and ::picker() like ::part() (#45504). 1 real stylesheets - Parse :window-inactive as an ordinary pseudo-class, and accept it after ::selection (#45815) - Print :nth-col(1) and :nth-last-col(1) in functional form (#41575) - `li::before::marker` failed the build (#45810) - `&` inside `:nth-child(... of S)` is resolved when nesting is compiled away. The second selector serializer (326 lines) is deleted (#43024) **Colors and `Bun.color`** - Keep light-dark() as written under the default browser targets (#42009). 227 real stylesheets - Number and percentage channels parse in `lab()`, `lch()`, `oklab()`, `oklch()`, `hsl()` and `hwb()`; the hue of `lch` / `oklch` is no longer scaled by alpha (#45084). 130 real stylesheets - `Bun.color` returns `null` for `currentColor`, system colors and `light-dark()` in the converting formats, instead of the CSS keyword as a string (#33047). 130 real stylesheets - Relative colors: channel keywords are on the scale of their function (`rgb(from #369 calc(r + 10) g b)`), the origin's alpha is kept, a relative color kept as written gets no `@supports` copies, and a result outside sRGB is not folded (#45362). 31 real stylesheets - Keep rotate: 0deg out of none, and keep the origin alpha in relative colors (#38486). 13 real stylesheets - Compute the D50 reference white in f32 so greys convert to lab(l 0 0) like lightningcss (#38535). 7 real stylesheets - Return a missing hue for a grey from conversions into lch, oklch, hsl and hwb (#45201). 5 real stylesheets - Fix color(a98-rgb), srgb-linear relative colors and color-mix(in xyz-d50) (#38487). 4 real stylesheets - Match named colors without regard to ASCII case (#45092). 3 real stylesheets - Fold min(), max() and clamp() over plain numbers (#39515) - `calc(l - .08)` in a percentage channel of a relative color became NaN and printed `#000` (also #45970) (#45971) - Bun.color: convert color() inputs instead of returning them as a CSS string (#38488) - A `color-mix(in srgb, ...)` result outside sRGB prints `color(srgb ...)` instead of a gamut-mapped hex (#39269) **`calc()` and numbers** - Rounding to 6 significant digits ate into the integer part: `z-index:2147483647` became `2147480000`, `max-width:9999999px` became `10000000px`, `--x:1234567.5` became `1234570`. It now only cuts a fraction short: a value kept as tokens prints its source text, a typed value prints every integer digit and at least one digit of the fraction (#46715). 43 real stylesheets - A number without a unit is no longer repaired into `px` (`height:1.5715` is dropped by a standards-mode browser, so it prints as written), `calc(-1 * 0)` is not a length, and on a property of the range [0,∞] (sizes, border radii, padding, border and outline widths, gap, `flex-basis`, `font-size`) a `calc()` that folds below zero prints `0` instead of an invalid negative literal, and a negative literal no longer replaces the valid declaration before it (`width:10px;width:-5px` printed `width:-5px`) (#42104). 24 real stylesheets - Print numbers from the f32's shortest digits, not its f64 expansion (#38565). 17 real stylesheets - Print negative numbers below 1 with a single minus sign (#38516) - Keep math functions over two different length units as written (#38489) - Fold rem() with a truncated quotient, so it keeps the sign of the dividend (#32286) - A one-argument `min()` / `max()` around a sum printed without any function (`width:100% - 20px`) (#46145) - `round()` breaks ties upward and handles a negative step as browsers do (#45249) **CSS modules** - A CSS module exports its `@keyframes` names (`styles.spin`). Hashing is unchanged (#46720). 145 real stylesheets - A name inside `:global(...)` prints plain but was exported as `name_<hash>`, a class no rule has (also #38573) (#45487). 90 real stylesheets - Keep container names global in CSS modules (#45247). 6 real stylesheets - Tag the keyframes name when an `animation` value falls back to raw tokens (#46034). 6 real stylesheets - In a plain stylesheet `composes: a from "./b.css"` was treated as an import: the file was inlined and an absolute path printed (#45961). 4 real stylesheets - Drop a rejected composes instead of failing the file at print time (#38538). 1 real stylesheets - Keep every rule's custom properties for the composes conflict check (#38523) - Keep composes working after a nested rule in the same block (#38520) - `IdentOrRef::hash` read 2 of 16 bytes, so in release builds every class of a module hashed alike (#30784) **Tokens, `url()`, diagnostics** - The block skip stack no longer allocates on every block exit (#39533) - Report the diagnostic's line without its line breaks in position.lineText (#38342). 192 real stylesheets - Compare `url()` values by their text (#46895). 26 real stylesheets - Values kept as tokens keep the blanks they were written with instead of having them re-invented at print time: `attr(x type(<number>))` printed `type(< number> )`, which browsers drop. Minified output still drops the blanks that cannot matter (#45577). 19 real stylesheets - The IE star hack (`*zoom:1`) failed the whole build. The declaration is skipped, as every browser does. It is the one syntax error that builds: tachyons, handsontable and jasmine ship it (#46751). 8 real stylesheets - The path of a copied asset spliced into `url()` is always quoted, so a file name with a space or a parenthesis cannot end the `url()` (#41557). 7 real stylesheets - Move the skip loop of parse_until_before out of the generic body (#39520) - Remove dead code from bun_css: the unused `impl Default for Property` (#45618) - Default the at-rule and qualified-rule parser traits, drop the url_to_css shim (#31999) **Speed** Four inputs that took quadratic or exponential time, or produced output out of proportion, are now linear, with no new limit and no extra pass (#31639, #42243, #38531, #43421). **Tests only** - `css-fuzz.test.ts` never ran in CI and timed out on debug builds; it is a deterministic table now (#38500) - `nth-anplusb-ident.test.ts` counts heaps in a child process (#46331) - `color.test.ts` checks the ansi-16 sweep with one `expect()` (#42824) - Not CSS, but it failed this PR's CI and fails on `main` too: `ws-proxy.test.ts` on Windows, "a message sent during a TLS renegotiation arrives after it". The helper server now renegotiates from the callback of the frame's write (#46170) **No pull request covered these** - `--v: 5.0.1` printed as `5.1`, `--w: 1.0.0` as `10`, `--x: 1+2` as `12`, `2n+1` as `2n1`: a number token that touches another keeps its source text. - `color-scheme: auto` printed as `normal`, and `color-scheme: dark light` as `light dark`. - A bare `:global` or `:local` in a CSS module sets the scope of the names after it, up to the end of the selector, as in css-loader. It was a build error. - The scrollbar states (`a:horizontal`, `::-webkit-scrollbar{&:horizontal{}}`) are valid in a plain compound, as in WebKit and Blink. - Without browser targets, `-webkit-box-align`, `-ms-flex-align` and the like were dropped next to their standard form (flatpickr, foundation-sites, materialize-css: 28 stylesheets), and `-webkit-fill-available` before `-moz-available` (beercss). - `(-o-min-device-pixel-ratio: 2/1)` printed as `2`. - `sin()`, `cos()` and `tan()` are exact at multiples of 90deg: `calc(100px * cos(90deg))` printed `-.00000437114px`. - A `display-p3` color at targets that have P3 but not the other `color()` spaces (Safari 10.1 to 14) got itself as a fallback. - `width: rem(-18px, 5px)` folds to a negative literal once `rem()` is right; it prints `0`. - Consecutive nested declarations rules, which arise when same-query `@media` blocks in one rule merge, are folded into one and count against the existing selector expansion limit as the `&{}` rules they replace did. #### Known and not fixed here - Four longhands are still folded into a `transition` the author did not write where the targets add a prefixed copy of a property (`mask-image` at Chrome 80): only the shorthand gives the copy its own times. - A later `background`, `box-shadow` or `border-*` declaration still loses to the `@supports` copy of an earlier `var()` value of the same property with a wide-gamut color. Same on `main`; #45560 is taken for the properties of the fallback handler and for unparsed values only. - A merged rule prints the unprefixed name in the passes of the rule it absorbed: `.d::-webkit-input-placeholder{}.d::-moz-placeholder{}` prints `::placeholder` for the second (#42106, not taken: it breaks the merge of prefix-equivalent rules). - The `border`, `outline` and `font` shorthands, `line-height`, `scroll-padding`, `background-size` and a few more still print a `calc()` that folds below zero as a negative literal. No real stylesheet has one. - `all` is not a property Bun knows, so `a{margin-top:1px;all:unset}` prints `all` first. Same on `main`. - A selector kept as raw tokens loses the blank before `*` when minified: `--sel: .dark *` prints `.dark*`. Same on `main`. - `width:calc(0% + 12px)` folds to `12px`, which lays out differently in a table cell. Same on `main`. - The `:dir()` / `:lang()` rules of a lowered logical property print before the nested rules of their rule, so a logical declaration written after a nested rule of equal specificity still loses to it. Same on `main`. - A fraction is still rounded to 6 significant digits (`12345.678` prints `12345.7`, `33.3333333333%` prints `33.3333%`). Keeping every digit would add up to 282 KB over the corpus. - `@keyframes "quoted"` is hashed in a module but not exported. - In a module, a keyframes name inside a `var()` fallback is not hashed: `animation: var(--enter, fade 1s)`. Same on `main`. - A `color-mix()` or relative color folded to a hex inside a gradient changes the interpolation from Oklab to sRGB (VS Code, clawhub). Printing `color(srgb ..)` instead needs a fallback for `mask-image`, `list-style-image` and custom properties at the default targets, which have none. - A comma list in `@container` still fails the build. - After a bare `:global`, names that are hashed at print time (`::view-transition-old(foo)`) are still hashed; inside `:global(...)` they are not. #### Pull requests in scope that do not land here - Duplicates of a pull request that lands here: #36961 (of #37979), #38478 (of #46662), #38480 (of #46733), #38482 (of #46715), #38491 (of #38500), #38508 (of #45201), #38513 (of #45362), #38573 (of #45487), #38640 (of #38500), #45525 (of #45247), #45589 (of #46756), #45970 (of #45971) - Already fixed on `main`: #38674 - Right, but for input nobody writes (0 of 10,116 stylesheets, and not new syntax): #31916, #38526, #38592, #39349, #41139, #41801, #42042, #42484, #43078, #45604, #45908, #46086, #46221, #46224, #46273, #46694, #46707, #46737, #46755, #46816, #46870, #46934 - Right or harmless, but not worth their code, their bigger output or the behavior they change: #30905, #31924, #33332, #34426, #36225, #38006, #38512, #38547, #38551, #38561, #38572, #38576, #38607, #38623, #38667, #38692, #42106, #42912, #42918, #43407, #43434, #44700, #45442, #45546, #45747, #45759, #45825, #45946, #46061, #46127, #46206 - Need a decision (see above), stay open: #40368, #40369, #44647, #44648, #45814 - Stays open: #45787 Out of scope: CSS linking and chunking in the bundler, the dev server, docs-only pull requests, and repository-wide sweeps that touch `src/css` in passing. Thanks to @mikamikasuki (#45247), @alii (#39520, #31999) and @oddharsh, whose measurements on #40369 and #41990 were used. Fixes #16727. Fixes #24770. Fixes #30772. Fixes #44704. Fixes #45089. Fixes #45237. Fixes #46872. ### How did you verify your code works? - The 35 CSS test files pass on a debug build, also with `FORCE_COLOR=1`. 600+ of the tests in this branch fail on a build of `main`. An earlier head of this branch passed all 179 CI jobs that ran. - The reproduction of each issue listed above was run on `main` (wrong) and on this branch (right). - Differential run over the 10,116 stylesheets, `main` against this branch, minified without targets and through `Bun.build` at the default targets: no stylesheet that builds on `main` fails; Chromium 156 compares the output with the input rule by rule (CSSOM, then computed values on a sized element in a standards-mode document, colors as painted pixels in sRGB and P3). The comparison has 195 control pairs that must read equal or different. For stylesheets that read differently on both builds, mostly because of lowering, the sets of differences were compared; the three new ones are two minifier fixtures that are wrong on both and one comparison artifact. - CSS modules are checked for consistency instead, since hashed names defeat the comparison: every reference points at a name the output defines, every export exists. - `Bun.color`: 59 inputs in 13 formats on both builds; every changed cell was read.

Jarred-Sumner · 2026-10-27T19:56:34Z

Landed in #47025 (7942008).

A strict range such as (width < 768px) lowered for old targets still matched at exactly 768px. The step is now .02px. The not all and form for other units is not taken. 18 real stylesheets

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robobun added 2 commits October 24, 2026 22:21