feat(service): treat html style attributes as CSS by dyc3 · Pull Request #11080 · biomejs/biome

dyc3 · 2026-07-26T02:39:38Z

Summary

This PR makes it so style attributes in HTML are treated as embedded css declaration snippets.

This PR originally implemented formatting too, but I've chosen to defer that to make decisions regarding these things:

prettier escapes quotes using html escapes - its debatable whether or not we actually want to format it like this
similarly, <div style="background: url('/img.png')"> gets formatted as <div style="background: url("/img.png")">, which is invalid

implemented by opus 5, but gpt 5.6 sol helped clean it up

supercedes and closes #10159

Test Plan

Docs

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changeset-bot · 2026-07-26T02:39:44Z

🦋 Changeset detected

Latest commit: ee221cf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@biomejs/biome	Patch
@biomejs/cli-win32-x64	Patch
@biomejs/cli-win32-arm64	Patch
@biomejs/cli-darwin-x64	Patch
@biomejs/cli-darwin-arm64	Patch
@biomejs/cli-linux-x64	Patch
@biomejs/cli-linux-arm64	Patch
@biomejs/cli-linux-x64-musl	Patch
@biomejs/cli-linux-arm64-musl	Patch
@biomejs/wasm-web	Patch
@biomejs/wasm-bundler	Patch
@biomejs/wasm-nodejs	Patch
@biomejs/backend-jsonrpc	Patch

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github-actions · 2026-07-26T02:39:48Z

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codspeed-hq · 2026-07-26T02:50:19Z

Merging this PR will degrade performance by 13.58%

❌ 5 regressed benchmarks
✅ 37 untouched benchmarks
⏩ 244 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	`BASE`	`HEAD`	Efficiency
❌	`css_analyzer[pure_9395922602181450299.css]`	23.9 ms	29.2 ms	-18.2%
❌	`css_analyzer[tachyons_11778168428173736564.css]`	182.5 ms	219.4 ms	-16.8%
❌	`css_analyzer[foundation_11602414662825430680.css]`	242.2 ms	281.7 ms	-14.04%
❌	`css_analyzer[bulma_5641719244145477318.css]`	1.2 s	1.3 s	-9.69%
❌	`css_analyzer[bootstrap_18416142857265205439.css]`	562.4 ms	616.4 ms	-8.77%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

_{Comparing dyc3/html-style-attribute-css (e01d8b4) with dyc3/svelte-double-curly (5393bde)}

244 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

github-actions · 2026-07-28T17:51:51Z

Parser conformance results on

js/262

Test result	`main` count	This PR count	Difference
Total	53595	53595	0
Passed	52312	52312	0
Failed	1241	1241	0
Panics	42	42	0
Coverage	97.61%	97.61%	0.00%

jsx/babel

Test result	`main` count	This PR count	Difference
Total	38	38	0
Passed	37	37	0
Failed	1	1	0
Panics	0	0	0
Coverage	97.37%	97.37%	0.00%

markdown/commonmark

Test result	`main` count	This PR count	Difference
Total	652	652	0
Passed	652	652	0
Failed	0	0	0
Panics	0	0	0
Coverage	100.00%	100.00%	0.00%

symbols/microsoft

Test result	`main` count	This PR count	Difference
Total	5467	5467	0
Passed	1915	1915	0
Failed	3552	3552	0
Panics	0	0	0
Coverage	35.03%	35.03%	0.00%

ts/babel

Test result	`main` count	This PR count	Difference
Total	676	676	0
Passed	592	592	0
Failed	84	84	0
Panics	0	0	0
Coverage	87.57%	87.57%	0.00%

ts/microsoft

Test result	`main` count	This PR count	Difference
Total	18876	18876	0
Passed	13010	13010	0
Failed	5865	5865	0
Panics	1	1	0
Coverage	68.92%	68.92%	0.00%

The value of a `style` attribute is a list of CSS declarations, but it was printed exactly as written, so whatever spacing it was pasted with stayed. It now goes through the CSS formatter, the way a `<style>` element already did. An attribute is not a block: the declarations stay on the tag's line while they fit and break onto their own lines once they do not, and the last one only takes a semicolon in the broken form. That is what `CssEmbeddingKind::HtmlStyleAttribute` selects, reusing the snippet root that already parses a bare declaration list. Such a list ends at the end of its input rather than at a `}`, so the final semicolon is now optional there — `style="color: red"` is how everyone writes it. Two supporting fixes: The trailing hard line break after embedded content moves from the `EndEmbedded` tag into the callers that wrap it. A block wants that break; an attribute value must not have one, since it would force the attribute onto its own line whatever its length. The formatter now knows which ranges have a parsed document waiting, as the JavaScript formatter already did. A hole nothing fills prints as nothing, so leaving one for a value that was never parsed would silently empty the attribute. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

@const

This PR contains the following updates: | Package | Type | Update | Change | Pending | |---|---|---|---|---| | [@biomejs/biome](https://biomejs.dev) ([source](https://github.com/biomejs/biome/tree/HEAD/packages/@biomejs/biome)) | imports | patch | [`2.5.7` -> `2.5.8`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.5.7/2.5.8) | `2.5.9` | --- ### Release Notes <details> <summary>biomejs/biome (@biomejs/biome)</summary> ### [`v2.5.8`](https://github.com/biomejs/biome/blob/HEAD/packages/@biomejs/biome/CHANGELOG.md#258) [Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.5.7...@biomejs/biome@2.5.8) ##### Patch Changes - [#10710](biomejs/biome#10710) [`0a0fbc1`](biomejs/biome@0a0fbc1) Thanks [@dyc3](https://github.com/dyc3)! - Added a new nursery rule [`useReactCompiler`](https://biomejs.dev/linter/rules/use-react-compiler/), which reports diagnostics from React Compiler lint mode. - [#11251](biomejs/biome#11251) [`ea9dd8a`](biomejs/biome@ea9dd8a) Thanks [@dyc3](https://github.com/dyc3)! - Improved performance of [`noImportCycles`](https://biomejs.dev/linter/rules/no-import-cycles/). - [#11247](biomejs/biome#11247) [`52b44d6`](biomejs/biome@52b44d6) Thanks [@dyc3](https://github.com/dyc3)! - Added the nursery rule [`noSvelteLegacyConst`](https://biomejs.dev/linter/rules/no-svelte-legacy-const/), which disallows legacy Svelte `{@const}` tags and recommends declaration tags with `$derived()`. Invalid: ```svelte {#each boxes as box} {@const area = box.width * box.height} <p>{area}</p> {/each} ``` Valid: ```svelte {#each boxes as box} {const area = $derived(box.width * box.height)} <p>{area}</p> {/each} ``` - [#11252](biomejs/biome#11252) [`d5f5704`](biomejs/biome@d5f5704) Thanks [@Turtle-Hwan](https://github.com/Turtle-Hwan)! - Fixed [#11250](biomejs/biome#11250): [`useAwait`](https://biomejs.dev/linter/rules/use-await/) no longer reports async functions that contain an `await using` declaration. - [#11143](biomejs/biome#11143) [`6be7be1`](biomejs/biome@6be7be1) Thanks [@vznh](https://github.com/vznh)! - Fixed [#11017](biomejs/biome#11017): [`noUselessUndefined`](https://biomejs.dev/linter/rules/no-useless-undefined/) no longer reports `return undefined` when the enclosing function has a return type annotation other than `undefined` or `void`. - [#11234](biomejs/biome#11234) [`caefe39`](biomejs/biome@caefe39) Thanks [@subotac](https://github.com/subotac)! - Fixed [#11228](biomejs/biome#11228): CSS block comments between a declaration colon and value now preserve their source indentation. ```diff :root { --font-stack: -/* comment */ + /* comment */ system-ui; } ``` - [#11285](biomejs/biome#11285) [`bca1f73`](biomejs/biome@bca1f73) Thanks [@denbezrukov](https://github.com/denbezrukov)! - Fixed [#11280](biomejs/biome#11280): CSS formatting keeps comments inside functional pseudo-classes and pseudo-elements instead of moving them before the function name. ```diff -:/* comment */ where(div) {} +:where(/* comment */ div) {} ``` - [#11080](biomejs/biome#11080) [`af16a0b`](biomejs/biome@af16a0b) Thanks [@dyc3](https://github.com/dyc3)! - HTML `style` attribute values are now parsed as CSS. All Biome CSS lint rules are applied to the `style` attributes. - [#11195](biomejs/biome#11195) [`6a85588`](biomejs/biome@6a85588) Thanks [@dyc3](https://github.com/dyc3)! - Fixed Svelte files failing to parse when an expression begins with an object literal. Now the following snippet is correctly parsed: ```svelte <p>{{ a: true }}</p> <div class={{ active: isActive }}></div> ``` - [#11173](biomejs/biome#11173) [`481d008`](biomejs/biome@481d008) Thanks [@Austin1serb](https://github.com/Austin1serb)! - Fixed [#10242](biomejs/biome#10242): JavaScript GritQL patterns with multiple metavariables now match snippets consistently in WebAssembly. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Added the nursery rule [`noInvalidPropertyInitValue`](https://biomejs.dev/linter/rules/no-invalid-property-init-value/), which reports an `@property` whose `initial-value` does not match its `syntax` descriptor. For example, the following declaration triggers the rule because `red` is not a `<length>`: ```css @Property --size { syntax: "<length>"; inherits: false; initial-value: red; } ``` - [#11272](biomejs/biome#11272) [`73896e6`](biomejs/biome@73896e6) Thanks [@ematipico](https://github.com/ematipico)! - Improved the diagnostic emitted by [`noRootType`](https://biomejs.dev/linter/rules/no-root-type). - [#11240](biomejs/biome#11240) [`bd0b68d`](biomejs/biome@bd0b68d) Thanks [@ematipico](https://github.com/ematipico)! - Fixed [#11223](biomejs/biome#11223): Improved the performance of [`noMisusedPromises`](https://biomejs.dev/linter/rules/no-misused-promises/) when analyzing async class methods that call other methods through `this`. - [#11172](biomejs/biome#11172) [`4a0bc5c`](biomejs/biome@4a0bc5c) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#10806](biomejs/biome#10806): [`noUselessFragments`](https://biomejs.dev/linter/rules/no-useless-fragments/) no longer causes Biome to panic when its unsafe fix removes a fragment used as a JSX attribute value. - [#11227](biomejs/biome#11227) [`4d603b0`](biomejs/biome@4d603b0) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#11178](biomejs/biome#11178): [`noUndeclaredVariables`](https://biomejs.dev/linter/rules/no-undeclared-variables/) no longer reports Vue's built-in instance properties, such as `$slots` and `$attrs`, in template expressions or `$event` in inline event-handler expressions. The instance properties are still reported inside `<script setup>`, where they are not defined. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Fixed CSS parsing of registered custom properties: Biome now correctly validates the `syntax` descriptor of `@property` rules. </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.oirnoir.dev/OIRNOIR/YouTube-Helper-Client/pulls/17

@const

This PR contains the following updates: | Package | Type | Update | Change | Pending | |---|---|---|---|---| | [@biomejs/biome](https://biomejs.dev) ([source](https://github.com/biomejs/biome/tree/HEAD/packages/@biomejs/biome)) | imports | patch | [`2.5.7` -> `2.5.8`](https://renovatebot.com/diffs/npm/@biomejs%2fbiome/2.5.7/2.5.8) | `2.5.9` | --- ### Release Notes <details> <summary>biomejs/biome (@biomejs/biome)</summary> ### [`v2.5.8`](https://github.com/biomejs/biome/blob/HEAD/packages/@biomejs/biome/CHANGELOG.md#258) [Compare Source](https://github.com/biomejs/biome/compare/@biomejs/biome@2.5.7...@biomejs/biome@2.5.8) ##### Patch Changes - [#10710](biomejs/biome#10710) [`0a0fbc1`](biomejs/biome@0a0fbc1) Thanks [@dyc3](https://github.com/dyc3)! - Added a new nursery rule [`useReactCompiler`](https://biomejs.dev/linter/rules/use-react-compiler/), which reports diagnostics from React Compiler lint mode. - [#11251](biomejs/biome#11251) [`ea9dd8a`](biomejs/biome@ea9dd8a) Thanks [@dyc3](https://github.com/dyc3)! - Improved performance of [`noImportCycles`](https://biomejs.dev/linter/rules/no-import-cycles/). - [#11247](biomejs/biome#11247) [`52b44d6`](biomejs/biome@52b44d6) Thanks [@dyc3](https://github.com/dyc3)! - Added the nursery rule [`noSvelteLegacyConst`](https://biomejs.dev/linter/rules/no-svelte-legacy-const/), which disallows legacy Svelte `{@const}` tags and recommends declaration tags with `$derived()`. Invalid: ```svelte {#each boxes as box} {@const area = box.width * box.height} <p>{area}</p> {/each} ``` Valid: ```svelte {#each boxes as box} {const area = $derived(box.width * box.height)} <p>{area}</p> {/each} ``` - [#11252](biomejs/biome#11252) [`d5f5704`](biomejs/biome@d5f5704) Thanks [@Turtle-Hwan](https://github.com/Turtle-Hwan)! - Fixed [#11250](biomejs/biome#11250): [`useAwait`](https://biomejs.dev/linter/rules/use-await/) no longer reports async functions that contain an `await using` declaration. - [#11143](biomejs/biome#11143) [`6be7be1`](biomejs/biome@6be7be1) Thanks [@vznh](https://github.com/vznh)! - Fixed [#11017](biomejs/biome#11017): [`noUselessUndefined`](https://biomejs.dev/linter/rules/no-useless-undefined/) no longer reports `return undefined` when the enclosing function has a return type annotation other than `undefined` or `void`. - [#11234](biomejs/biome#11234) [`caefe39`](biomejs/biome@caefe39) Thanks [@subotac](https://github.com/subotac)! - Fixed [#11228](biomejs/biome#11228): CSS block comments between a declaration colon and value now preserve their source indentation. ```diff :root { --font-stack: -/* comment */ + /* comment */ system-ui; } ``` - [#11285](biomejs/biome#11285) [`bca1f73`](biomejs/biome@bca1f73) Thanks [@denbezrukov](https://github.com/denbezrukov)! - Fixed [#11280](biomejs/biome#11280): CSS formatting keeps comments inside functional pseudo-classes and pseudo-elements instead of moving them before the function name. ```diff -:/* comment */ where(div) {} +:where(/* comment */ div) {} ``` - [#11080](biomejs/biome#11080) [`af16a0b`](biomejs/biome@af16a0b) Thanks [@dyc3](https://github.com/dyc3)! - HTML `style` attribute values are now parsed as CSS. All Biome CSS lint rules are applied to the `style` attributes. - [#11195](biomejs/biome#11195) [`6a85588`](biomejs/biome@6a85588) Thanks [@dyc3](https://github.com/dyc3)! - Fixed Svelte files failing to parse when an expression begins with an object literal. Now the following snippet is correctly parsed: ```svelte <p>{{ a: true }}</p> <div class={{ active: isActive }}></div> ``` - [#11173](biomejs/biome#11173) [`481d008`](biomejs/biome@481d008) Thanks [@Austin1serb](https://github.com/Austin1serb)! - Fixed [#10242](biomejs/biome#10242): JavaScript GritQL patterns with multiple metavariables now match snippets consistently in WebAssembly. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Added the nursery rule [`noInvalidPropertyInitValue`](https://biomejs.dev/linter/rules/no-invalid-property-init-value/), which reports an `@property` whose `initial-value` does not match its `syntax` descriptor. For example, the following declaration triggers the rule because `red` is not a `<length>`: ```css @Property --size { syntax: "<length>"; inherits: false; initial-value: red; } ``` - [#11272](biomejs/biome#11272) [`73896e6`](biomejs/biome@73896e6) Thanks [@ematipico](https://github.com/ematipico)! - Improved the diagnostic emitted by [`noRootType`](https://biomejs.dev/linter/rules/no-root-type). - [#11240](biomejs/biome#11240) [`bd0b68d`](biomejs/biome@bd0b68d) Thanks [@ematipico](https://github.com/ematipico)! - Fixed [#11223](biomejs/biome#11223): Improved the performance of [`noMisusedPromises`](https://biomejs.dev/linter/rules/no-misused-promises/) when analyzing async class methods that call other methods through `this`. - [#11172](biomejs/biome#11172) [`4a0bc5c`](biomejs/biome@4a0bc5c) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#10806](biomejs/biome#10806): [`noUselessFragments`](https://biomejs.dev/linter/rules/no-useless-fragments/) no longer causes Biome to panic when its unsafe fix removes a fragment used as a JSX attribute value. - [#11227](biomejs/biome#11227) [`4d603b0`](biomejs/biome@4d603b0) Thanks [@saberoueslati](https://github.com/saberoueslati)! - Fixed [#11178](biomejs/biome#11178): [`noUndeclaredVariables`](https://biomejs.dev/linter/rules/no-undeclared-variables/) no longer reports Vue's built-in instance properties, such as `$slots` and `$attrs`, in template expressions or `$event` in inline event-handler expressions. The instance properties are still reported inside `<script setup>`, where they are not defined. - [#11187](biomejs/biome#11187) [`23c0369`](biomejs/biome@23c0369) Thanks [@ematipico](https://github.com/ematipico)! - Fixed CSS parsing of registered custom properties: Biome now correctly validates the `syntax` descriptor of `@property` rules. </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.oirnoir.dev/OIRNOIR/YouTube-Helper-Server/pulls/36

github-actions Bot added A-CLI Area: CLI A-Project Area: project A-Parser Area: parser A-Formatter Area: formatter L-CSS Language: CSS and super languages L-HTML Language: HTML and super languages labels Jul 26, 2026

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dyc3 changed the base branch from dyc3/svelte-attribute-shorthand to dyc3/svelte-double-curly August 3, 2026 12:58

dyc3 changed the title ~~feat(format/html): format the style attribute as CSS~~ feat(service): treat html style attributes as CSS Aug 3, 2026

dyc3 marked this pull request as ready for review August 3, 2026 17:52

ematipico approved these changes Aug 3, 2026

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Comment thread crates/biome_cli/tests/cases/html_style_attribute.rs

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dyc3 and others added 4 commits August 3, 2026 20:05

refactor: less janky handling of sub-token embedded content

6a3b2e2

refactor(css): use declaration root for style attributes

907d6b6

feat: remove formatting, only parse and lint for style attributes

ee221cf

dyc3 force-pushed the dyc3/html-style-attribute-css branch from e01d8b4 to ee221cf Compare August 4, 2026 00:06

dyc3 changed the base branch from dyc3/svelte-double-curly to main August 4, 2026 00:07

ematipico mentioned this pull request Aug 4, 2026

feat(lint): rule noUndeclaredCustomProperties #11191

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ematipico merged commit af16a0b into main Aug 4, 2026
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ematipico deleted the dyc3/html-style-attribute-css branch August 4, 2026 15:46

github-actions Bot mentioned this pull request Aug 4, 2026

ci: release #11236

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feat(service): treat html style attributes as CSS - #11080

feat(service): treat html style attributes as CSS#11080
ematipico merged 4 commits into
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dyc3/html-style-attribute-css

dyc3 commented Jul 26, 2026 •

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changeset-bot Bot commented Jul 26, 2026 •

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dyc3 commented Jul 26, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Summary

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changeset-bot Bot commented Jul 26, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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🦋 Changeset detected

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github-actions Bot commented Jul 26, 2026

✅ Organic activity

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codspeed-hq Bot commented Jul 26, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Merging this PR will degrade performance by 13.58%

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github-actions Bot commented Jul 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Parser conformance results on

js/262

jsx/babel

markdown/commonmark

symbols/microsoft

ts/babel

ts/microsoft

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dyc3 commented Jul 26, 2026 •

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