fix: ensure CSS URLs are correct when inlining client stylesheets by teemingc · Pull Request #15153 · sveltejs/kit

teemingc · 2026-01-11T18:26:02Z

This PR replaces the janky server-client css mapping (introduced by me) with simply replacing the asset URL references with the correct path when we inline the styles. Not only does this massively simplify things, it allows us to correctly prefix the paths based on the settings from paths.relative or path.assets.

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teemingc · 2026-01-11T18:49:52Z

packages/kit/test/apps/options/package.json

+		"test:dev": "DEV=true playwright test && DEV=true PATHS_ASSETS=https://cdn.example.com/stuff playwright test",
+		"test:build": "playwright test && PATHS_ASSETS=https://cdn.example.com/stuff playwright test",


This seemed like the easiest way to test both CSS inlining with and without paths.assets without introducing another test matrix.

paths.assets replaces the CSS asset urls at build time but paths.relative does it at runtime

packages/kit/src/utils/css.js

teemingc · 2026-01-12T16:55:22Z

packages/kit/src/utils/css.js

+ * @returns {string}
+ */
+export function replace_css_relative_url(contents, base) {
+	return contents.replaceAll(/url\((['"]?)\.\//ig, `url($1${base}/`);


Fortunately, we don't have to worry about the @import 'app.css' case that omits the url(...) syntax because Vite inlines the referenced stylesheet even when referenced by more than one other stylesheet https://vite.dev/guide/features#import-inlining-and-rebasing

packages/kit/src/utils/css.spec.js

packages/kit/src/utils/css.js

elliott-with-the-longest-name-on-github

I pushed some whitespace-handling changes just to guard against edge cases (I don't think we actually have to worry about them because I don't think Vite will output CSS like that... but better to be safe).

The only other edge cases I can think of:

Is it a problem that this doesn't work on relative paths without ./ in front of them? i.e. url(img.png) won't get transformed.
This will replace content inside strings. So if you had the CSS content: "Example: If you were to put url(./rickroll.gif) here...", it would get modified, in spite of being a string. I don't see a way around this other than actually parsing the CSS contents with a CSS parser...

teemingc · 2026-01-13T01:28:49Z

Is it a problem that this doesn't work on relative paths without ./ in front of them? i.e. url(img.png) won't get transformed.

I think after Vite processes the CSS the urls are always prefixed with ./ but I can check how it’s handled from both the static folder or otherwise to see if they do end up this way.

This will replace content inside strings. So if you had the CSS content: "Example: If you were to put url(./rickroll.gif) here...", it would get modified, in spite of being a string. I don't see a way around this other than actually parsing the CSS contents with a CSS parser...

Yeah, I think I should try out a CSS parser. Otherwise, maybe we’d have to do a negative lookahead. Are there any CSS parsers that you’d recommend?

EDIT: I see we were previously using csstree in Svelte so we can probably try that?

teemingc · 2026-01-13T22:06:00Z

Is it a problem that this doesn't work on relative paths without ./ in front of them? i.e. url(img.png) won't get transformed.

So I did some testing and here are the results:

If the asset can be found, it's always suffixed with ./ and lives next to the CSS file.
If the asset can be found and it's located in the static folder, it's suffixed with ../../../ because static assets are located at the root path and it's relative to _app/immutable/assets.
If the asset can't be found, the url value remains the same.

format

teemingc · 2026-01-14T10:30:30Z

We'll use the Svelte CSS parser to identify declaration values and avoid accidentally affecting comments, strings, etc.
We'll also transform the stored CSS from a string to a function so we can easily plug in the relative path at runtime
We'll need to handle the case where the asset path is referencing something from the root because it was placed in a static dir. I've already added a test for this.

elliott-with-the-longest-name-on-github

This is looking awesome, tysm

packages/kit/test/apps/options/test/test.js

packages/kit/src/utils/css.spec.js

packages/kit/src/utils/css.js

elliott-with-the-longest-name-on-github · 2026-01-26T19:41:14Z

packages/kit/src/utils/css.js

+				const url_value_match = /url\(\s*(['"]?)(.*?)\1\s*\)/i.exec(url_declaration);
+				if (!url_value_match) continue;
+
+				const [, , url] = url_value_match;


I think you could use non-capturing groups ((?:)) for the stuff you don't actually want to capture to avoid these weird commas

The quotation's using a capture group so that it matches against the same type of closing quotation mark. This avoids matching a double quote in a single quoted string.

Unfortunately, this doesn't account for backslashed quotes in the same string

I think I've fixed the escaped characters edge case but the CSS parser is duplicating the escaped characters in the declaration value it returns. I think we need to avoid adding the same characters twice here https://github.com/sveltejs/svelte/blob/9662010a135937b7a920eaf93933be7b8b0c9c9e/packages/svelte/src/compiler/phases/1-parse/read/style.js#L508-L525 Currently, a string such as \s becomes \\ss in the returned AST

EDIT: opened a PR for it here sveltejs/svelte#17554

EDIT2: We just need to wait for sveltejs/svelte#17555 to be merged and update the Svelte version in Kit to get the tests passing

packages/kit/src/utils/css.js

elliott-with-the-longest-name-on-github · 2026-01-27T20:50:56Z

packages/kit/src/utils/css.js

+ * @param {string} value
+ * @returns {string}
+ */
+function tippex_comments_and_strings(value) {


I did have to google what tippex meant :laugh:

elliott-with-the-longest-name-on-github

I fixed several tippex function edge cases and pushed a bunch of test cases to make sure it never regresses -- thank you so much for your work on this gnarly bug. Great job!

@teemingc

…eltejs#15153) * add fix and test format * add unit test * changeset * add test for inlining conditionally rendered component css * format * Apply suggestion from @teemingc * Apply suggestion from @teemingc * Update css.js * handle whitespace, add some additional test cases * add failing test for assets in static dir * bump svelte * this should just work * fix lockfile * ok its working now * last fix * format * push wip * tests are passing * split tests * rename parser to parse * hoist regexes * use test.each * add test for content and comments * rename assets to paths_assets * add tests for escaped characters * add test for encoded characters * safeguard against trailing slashes * decode vite asset filenames * a bit of clean up * oops * tippex comments * tippex strings * tippex wip * harden comment and escaped character tests * account for nested app dir * bump svelte * chore: fix tippex and add test cases --------- Co-authored-by: Elliott Johnson <hello@ell.iott.dev> Co-authored-by: Rich Harris <rich.harris@vercel.com>

@teemingc

* fix(adapter-node): validate ORIGIN env var at startup (#14978) - Add parse_origin() utility to validate and normalize origin URLs - Server now fails fast with clear error for invalid ORIGIN - Automatically normalize default ports and strip path/query/hash - Add tests for origin validation * add changeset * chore(deps): update pnpm to v10.25.0 (#15043) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * chore: Test remote functions with full-async setup (#15033) * checkpoint * donesies * fix: lockfile * update svelte-check * add .env for test app * fix flaky test * polyfill withResolvers * chore(deps): update actions/upload-artifact action to v6 (#15057) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * chore(deps): update pnpm to v10.26.0 (#15065) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * fix: make typescript an optional peer dependency (#15074) Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com> * docs: update Wrangler command for Cloudflare Workers testing (#15077) * chore(deps): update pnpm to v10.26.2 (#15072) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * docs: clarify remote function import (#15082) Tiny detail to make it super clear the import is for remote functions. * docs: update description for `static` folder (#15087) Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com> * chore: upgrade Playwright (#15089) * chore: Upgrade Playwright * checkpoint, not sure what else is going wrong * i have never been so happy to see a test failure * fix lockfile maybe * fix: remove playwright * more flaky tests * fix clicknav * fix another flaky test * improve further * another clicknav usage * chore: upgrade jws (#15095) * chore: upgrade js-yaml (#15096) * feat: expose `waitUntil` also for serverless runtime & add docs (#14725) * improvement: expose `waitUntil` also for serverless runtime & add documentation * changeset * revert previous changes and add docs * revert previous changes * change changeset --------- Co-authored-by: Tee Ming <chewteeming01@gmail.com> * chore(deps): update vitest monorepo to v4 (major) (#14789) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: Tee Ming <chewteeming01@gmail.com> * fix: avoid overridden Vite config warning with Vitest 4 (#15121) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: teemingc <54401897+teemingc@users.noreply.github.com> Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com> * docs: remove `$lib` path customization (#14812) * docs: remove `$lib` path customization Updated documentation for $lib import alias in SvelteKit. * Update documentation/docs/98-reference/26-$lib.md Co-authored-by: Tee Ming <chewteeming01@gmail.com> * chore: remove deprecated comment --------- Co-authored-by: Tee Ming <chewteeming01@gmail.com> * fix: use hasOwn check when deep-setting object properties (#15127) * Version Packages (#15091) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> * chore: upgrade to pnpm 10.27.0 (#15128) * fix: add `has(name, value)` overload for URLSearchParams (#15076) * Add support for SearchParams.has(name, value) overload * generate changeset * Update .changeset/sharp-tires-work.md --------- Co-authored-by: Elliott Johnson <hello@ell.iott.dev> Co-authored-by: Elliott Johnson <elliott.johnson@vercel.com> * Apply suggestions from code review Co-authored-by: Tee Ming <chewteeming01@gmail.com> * fix: support instrumentation for `vite preview` (#15105) The `instrumentation.server.js` file is now imported when running `vite preview`. 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<41898282+github-actions[bot]@users.noreply.github.com> * chore: docs update on `vitePreprocess` (#15185) * fix: don't send "Vary: Accept-Encoding" header when precompress=false (#15182) * Disable sirv compression checks when precompress=false * Add changeset * Update .changeset/sweet-spoons-study.md --------- Co-authored-by: Elliott Johnson <hello@ell.iott.dev> * fix: include `hooks.server` and `hooks.universal` as entrypoints to give them stable manifest identifiers (#15178) * fix: include `hooks.server` and `hooks.universal` as entrypoints to give them stable manifest identifiers * changeset * yep * lockfile --------- Co-authored-by: Tee Ming <chewteeming01@gmail.com> * fix: Skip failing tests on async (#15189) * fix: preload links if href changes (#15191) * test * fix * changeset * docs: update cloudflare adapter package description and misc (#15164) * simplify workers and pages distinction * support workers ci in adapter auto * add todo * remove todo * 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handle whitespace, add some additional test cases * add failing test for assets in static dir * bump svelte * this should just work * fix lockfile * ok its working now * last fix * format * push wip * tests are passing * split tests * rename parser to parse * hoist regexes * use test.each * add test for content and comments * rename assets to paths_assets * add tests for escaped characters * add test for encoded characters * safeguard against trailing slashes * decode vite asset filenames * a bit of clean up * oops * tippex comments * tippex strings * tippex wip * harden comment and escaped character tests * account for nested app dir * bump svelte * chore: fix tippex and add test cases --------- Co-authored-by: Elliott Johnson <hello@ell.iott.dev> Co-authored-by: Rich Harris <rich.harris@vercel.com> * fix: use validated args in batch resolver (#15215) Co-authored-by: Elliott Johnson <hello@ell.iott.dev> Co-authored-by: Rishab49 <25582966+Rishab49@users.noreply.github.com> * chore(deps): update dependency set-cookie-parser to v3 (#15155) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> * fix: only match rest params with matchers when the matcher matches (#15216) * chore: restore previous explicit version for magic-string dependency in package.json of public packages (#15217) * fix: emit script CSP nonces when is present if is also present (#15221) * Update pnpm-workspace.yaml (#15218) * fix(kit): properly handle percent-encoded anchors during prerendering (#15231) * fix(kit): properly handle percent-encoded anchors during prerendering * changelog * Apply suggestion from @GauBen * improve tests --------- Co-authored-by: Elliott Johnson <hello@ell.iott.dev> * feat: export type Picture in enhanced-img (#15225) * feat: export type Picture in enhanced-img This type is part of public api, so it should be reexported. Otherwise users have to explicitly add "vite-imagetools", or use hacks like `typeof import('fake.jpg?enhanced').default` This type is needed when using `import.meta.glob`, because by default it is getting typed as `unknown`. * Apply suggestion from @teemingc Co-authored-by: Tee Ming <chewteeming01@gmail.com> * tweak --------- Co-authored-by: Elliott Johnson <hello@ell.iott.dev> Co-authored-by: Tee Ming <chewteeming01@gmail.com> * handle pr review comments * fix: address PR review comments * chore: remove obsolete changesets consumed by releases * Apply suggestion from @elliott-with-the-longest-name-on-github Co-authored-by: Elliott Johnson <hello@ell.iott.dev> * cleanup * silly github --------- Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: Elliott Johnson <elliott.johnson@vercel.com> Co-authored-by: Ondrej Čierny <cierny@users.noreply.github.com> Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com> Co-authored-by: Tee Ming <chewteeming01@gmail.com> Co-authored-by: Samuel Plumppu <6125097+Greenheart@users.noreply.github.com> Co-authored-by: Scott Wu <sw@scottwu.ca> Co-authored-by: Leon Scherer <55341374+Fruup@users.noreply.github.com> Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com> Co-authored-by: teemingc <54401897+teemingc@users.noreply.github.com> Co-authored-by: Hyunbin Seo <47051820+hyunbinseo@users.noreply.github.com> Co-authored-by: Rich Harris <richard.a.harris@gmail.com> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Rory Duncan <RoryDuncan@users.noreply.github.com> Co-authored-by: Elliott Johnson <hello@ell.iott.dev> Co-authored-by: Alois Klink <alois@aloisklink.com> Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com> Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com> Co-authored-by: Rich Harris <rich.harris@vercel.com> Co-authored-by: Andrew Dailey <andrew@shallowbrooksoftware.com> Co-authored-by: jyc.dev <jycouet@gmail.com> Co-authored-by: Thomas LE JEUNE <thomastheyoung@gmail.com> Co-authored-by: Ottomated <otto@ottomated.net> Co-authored-by: ottomated <31470743+ottomated@users.noreply.github.com> Co-authored-by: Junha Heo <hashcoko@gmail.com> Co-authored-by: Conduitry <git@chor.date> Co-authored-by: Dominik G. <dominik.goepel@gmx.de> Co-authored-by: Patrick <Patrick@ShowYou.us> Co-authored-by: Chew Tee Ming <chew.tee.ming@nindatech.com> Co-authored-by: Richard Smith <richardmcsmith@gmail.com> Co-authored-by: Matt DeKok <matt@dekok.dev> Co-authored-by: Rishab49 <25582966+Rishab49@users.noreply.github.com> Co-authored-by: Gautier Ben Aïm <48261497+GauBen@users.noreply.github.com> Co-authored-by: blt-r <63462729+blt-r@users.noreply.github.com>

teemingc requested a review from elliott-with-the-longest-name-on-github January 11, 2026 18:47

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teemingc and others added 11 commits January 14, 2026 15:57

add fix and test

ac63953

format

add unit test

2f60ab4

changeset

251e4c8

add test for inlining conditionally rendered component css

885a5c8

format

3ff57e2

Apply suggestion from @teemingc

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Apply suggestion from @teemingc

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Update css.js

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handle whitespace, add some additional test cases

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Merge branch 'main' into fix-missing-css-with-inlining-enabled

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add failing test for assets in static dir

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teemingc force-pushed the fix-missing-css-with-inlining-enabled branch from 09886d8 to df13a14 Compare January 14, 2026 08:04

Merge branch 'main' into fix-missing-css-with-inlining-enabled

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teemingc changed the title ~~fix: use regex to replace CSS paths instead of mapping server CSS~~ fix: fix CSS URL paths of client stylesheets Jan 14, 2026

teemingc marked this pull request as draft January 14, 2026 10:29

Merge branch 'main' into fix-missing-css-with-inlining-enabled

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teemingc changed the title ~~fix: fix CSS URL paths of client stylesheets~~ fix: ensure CSS URLs are correct when inlining client stylesheets Jan 22, 2026

teemingc added 2 commits January 22, 2026 23:56

bump svelte

b457b97

this should just work

88aa343

teemingc added 2 commits January 26, 2026 13:56

Merge branch 'main' into fix-missing-css-with-inlining-enabled

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Merge branch 'main' into fix-missing-css-with-inlining-enabled

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elliott-with-the-longest-name-on-github reviewed Jan 26, 2026

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teemingc added 14 commits January 27, 2026 11:24

split tests

4e665a2

rename parser to parse

8cdc8c6

hoist regexes

41c3280

use test.each

d26f914

add test for content and comments

fe352d5

rename assets to paths_assets

6807f52

add tests for escaped characters

f34dbad

add test for encoded characters

27e522e

safeguard against trailing slashes

abc4c64

decode vite asset filenames

4902991

a bit of clean up

5a6e24e

oops

0a019aa

tippex comments

b9e9fa3

tippex strings

7f260ba

teemingc mentioned this pull request Jan 27, 2026

fix: avoid duplicating escaped characters when parsing styles sveltejs/svelte#17554

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teemingc and others added 4 commits January 27, 2026 20:58

tippex wip

cacb600

harden comment and escaped character tests

3f4bea3

account for nested app dir

6894599

bump svelte

5f3fbf8

elliott-with-the-longest-name-on-github reviewed Jan 27, 2026

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chore: fix tippex and add test cases

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elliott-with-the-longest-name-on-github approved these changes Jan 27, 2026

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elliott-with-the-longest-name-on-github merged commit 52965cf into main Jan 27, 2026
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elliott-with-the-longest-name-on-github deleted the fix-missing-css-with-inlining-enabled branch January 27, 2026 21:38

github-actions bot mentioned this pull request Jan 27, 2026

Version Packages #15207

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		"test:dev": "DEV=true playwright test && DEV=true PATHS_ASSETS=https://cdn.example.com/stuff playwright test",
		"test:build": "playwright test && PATHS_ASSETS=https://cdn.example.com/stuff playwright test",

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Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

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