This Month in Servo: October 2025

_posts/2025-11-02-this-month-in-servo.md

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+---
+layout:     post
+tags:       blog
+title:      "This month in Servo: ??????????"
+date:       2025-11-02
+summary:    Who even knows?
+categories:
+---
+
+Servo now supports several new web platform features:
+
+- **CompressionStream** and **DecompressionStream** (@kkoyung, #39658)
+- **fetchLater** (@TimvdLippe, #39547), with `dom_abort_controller_enabled`
+
+Our HTML-compatible **XPath** implementation now lives in its [own](https://github.com/servo/servo/tree/cd4c032908211fa2c26df550f6766080d1d28969/components/xpath) [crate](https://doc.servo.org/xpath/), and it’s no longer limited to the Servo DOM (@simonwuelker, #39546).
+We don’t have any specific plans to release this as a standalone library just yet, but please let us know if you have a use case that would benefit from this!
+
+Servo now supports `new KeyboardEvent({keyCode})` and `({charCode})` (@atbrakhi, #39590), which is enough to get [**Speedometer 3.0**](https://browserbench.org/Speedometer3.0/) working on macOS.
+
+## Donations
+
+Thanks again for your generous support!
+We are now receiving **??? USD/month** (+?.?% over September) in recurring donations.
+
+This helps us cover the cost of our **[speedy](https://ci0.servo.org) [CI](https://ci1.servo.org) [and](https://ci2.servo.org) [benchmarking](https://ci3.servo.org) [servers](https://ci4.servo.org)**, one of our latest **[Outreachy interns](https://www.outreachy.org/alums/2025-06/#:~:text=Servo)**, and funding **[maintainer work]({{ '/blog/2025/09/17/your-donations-at-work-funding-jdm/' | url }})** that helps more people contribute to Servo.
+Keep an eye out for [further CI improvements](https://github.com/servo/servo/issues/38141) in the coming months, including [faster pull request checks](https://github.com/servo/servo/pull/39900) and [ten-minute WPT builds](https://github.com/servo/ci-runners/issues/21).
+
+Servo is also on [thanks.dev](https://thanks.dev), and already **?** (±? from September) that depend on Servo are sponsoring us there.
+If you use Servo libraries like [url](https://crates.io/crates/url/reverse_dependencies), [html5ever](https://crates.io/crates/html5ever/reverse_dependencies), [selectors](https://crates.io/crates/selectors/reverse_dependencies), or [cssparser](https://crates.io/crates/cssparser/reverse_dependencies), signing up for [thanks.dev](https://thanks.dev) could be a good way for you (or your employer) to give back to the community.
+
+<figure class="_fig" style="width: 100%; margin: 1em 0;"><div class="_flex" style="height: calc(1lh + 3em); flex-flow: column nowrap; text-align: left;">
+    <div style="position: relative; text-align: right;">
+        <div style="position: absolute; margin-left: calc(100% * 5654 / 10000); padding-left: 0.5em;"><strong>5654</strong> USD/month</div>
+        <div style="position: absolute; margin-left: calc(100% * 5654 / 10000); height: calc(1lh + 1.5em); border-left: 1px solid;"></div>
+        <div style="position: absolute; margin-left: calc(100% - 0.5em); height: calc(1lh + 1.5em); border-left: 1px solid;"></div>
+        <div style="padding-right: 1em;"><strong>10000</strong><!-- USD/month --></div>
+    </div>
+    <progress value="5654" max="10000" style="transform: scale(3); transform-origin: top left; width: calc(100% / 3);"></progress>
+</div></figure>
+
+Use of donations is decided transparently via the Technical Steering Committee’s public **[funding request process](https://github.com/servo/project/blob/main/FUNDING_REQUEST.md)**, and active proposals are tracked in [servo/project#187](https://github.com/servo/project/issues/187).
+For more details, head to our [Sponsorship page]({{ '/sponsorship/' | url }}).
+
+<style>
+    ._correction {
+        max-width: 33em;
+        margin: 1em auto;
+        border-bottom: 1px solid;
+        padding-bottom: 1em;
+    }
+    ._note {
+        margin: 1em 1em;
+        border-left: 1px solid;
+        padding-left: 1em;
+        opacity: 0.75;
+    }
+</style>

outline.txt

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+- api
+    - https://github.com/servo/servo/pull/39738	(@atbrakhi, @mrobinson, @shubhamg13, #39738)	libservo: Modify the `WebView::set_zoom` to take final zoom value  (#39738)
+      api; WebView::set_zoom() is now set_page_zoom(); it’s now absolute not relative; reset_zoom() was removed; page_zoom() was added
+    - https://github.com/servo/servo/pull/39720	(@mrobinson, #39720)	libservo: Unify notifications to the embedder that input events are handled (#39720)
+      api; WebViewDelegate::notify_keyboard_event() is now notify_input_event_handled(); now covers all input events; now includes information about whether the event was consumed and/or had preventDefault
+- crash
+    - https://github.com/servo/servo/pull/39771	(@mrobinson, #39771)	servoshell: Reimplement "onClick" action on Android (#39771)
+      crash; fixed crash when clicking on web content on android
+- crate
+    - DONE https://github.com/servo/servo/pull/39546	(@simonwuelker, #39546)	Move XPath implementation into its own crate (#39546)
+      crate; xpath implementation with a bring-your-own-dom API
+- dev
+    - https://github.com/servo/servo/pull/39625	(@delan, #39625)	NixOS: bump nixpkgs and fix etc/devtools_parser.py (#39625)
+      dev; on nixos and nix, upgrade from LLVM 14 to 20, and fix some build issues
+    - https://github.com/servo/servo/pull/39789	(@jschwe, @sagudev, #39789)	Add unittest code coverage to CI  (#39789)
+      dev; unit tests now have code coverage in CI
+    - https://github.com/servo/servo/pull/39272	(@delan, #39272)	ci: Run bencher jobs on self-hosted runners (#39272)
+      dev; CI jobs for runtime benchmarks now run on self-hosted runners
+- dom
+    - https://github.com/servo/servo/pull/39506	(@tharkum, #39506)	html: Allow legacy referrer policies only for <meta> referrer (#39506)
+      dom
+    - https://github.com/servo/servo/pull/39544	(@RichardTjokroutomo, @jdm, @yezhizhen, #39544)	script: Add line number argument to module script compilation functions (#39544)
+      dom
+    - https://github.com/servo/servo/pull/39564	(@kkoyung, #39564)	script: Return cached object from `CryptoKey.usages` getter (#39564)
+      dom
+    - DONE https://github.com/servo/servo/pull/39590	(@atbrakhi, #39590)	script: Support `keyCode`, `charCode` in KeyboardEvent constructor (#39590)
+      dom
+    - DONE https://github.com/servo/servo/pull/39547	(@TimvdLippe, #39547)	Implement `fetchLater` (#39547)
+      dom; pref-gated
+    - https://github.com/servo/servo/pull/39607	(@mrobinson, #39607)	script: Do not show simple dialogs for Windows that cannot show them and normalize newlines (#39607)
+      dom
+    - https://github.com/servo/servo/pull/39610	(@mrobinson, @Loirooriol, #39610)	script: Use CSP sandboxing flags for `<iframe>` and pass them to child `Document`s (#39610)
+      dom
+    - https://github.com/servo/servo/pull/39570	(@Gae24, #39570)	script: further restrict accepted worker script (#39570)
+      dom
+    - https://github.com/servo/servo/pull/39686	(@mrobinson, @Loirooriol, #39686)	script: Allow loading of `<iframe srcdoc>` with a `sandbox` attribute (#39686)
+      dom
+    - https://github.com/servo/servo/pull/39661	(@WaterWhisperer, #39661)	htmlbuttonelement: check if document is fully active in activation behavior (#39661)
+      dom
+    - https://github.com/servo/servo/pull/39635	(@tharkum, #39635)	html: Do not update the image data inside legacy <image> constructor (#39635)
+      dom
+    - https://github.com/servo/servo/pull/39606	(@tharkum, #39606)	html: Add missing 'width' and 'height' reflected IDL dimension attributes (#39606)
+      dom
+    - https://github.com/servo/servo/pull/39717	(@tharkum, #39717)	html: Support selecting <media> element source from children (#39717)
+      dom
+    - https://github.com/servo/servo/pull/39749	(@simonwuelker, #39749)	xpath: Let the parents of attribute nodes be their owner elements (#39749)
+      dom; implement `@attr/parent`
+    - DONE https://github.com/servo/servo/pull/39658	(@kkoyung, #39658)	script: Implement Compression API (#39658)
+      dom
+- embedding
+    - https://github.com/servo/servo/pull/39583	(@mrobinson, @delan, #39583)	libservo: Add a `WebView::take_screenshot()` API and use it for reftests (#39583)
+      embedding
+    - https://github.com/servo/servo/pull/39705	(@mrobinson, #39705)	libservo: Remove `MouseButtonAction::Click` from the API (#39705)
+      embedding
+- input
+    - https://github.com/servo/servo/pull/39776	(@mrobinson, #39776)	webdriver: Send events to the embedder as `InputEvent` with a response channel (#39776)
+      input; similar change, but in webdriver, which is an internal part of servoshell
+    - https://github.com/servo/servo/pull/39810	(@mrobinson, #39810)	libservo: Notify the embedder when an input event can't be sent to a Pipeline (#39810)
+      input; more reliable notification of input events in some edge cases
+- layout
+    - https://github.com/servo/servo/pull/36322	(@Loirooriol, #36322)	layout: Let min/max constraints avoid collapsing bottom margins (#36322)
+      layout
+    - https://github.com/servo/servo/pull/39571	(@Loirooriol, #39571)	layout: Avoid negative corner radii values for border-radius (#39571)
+      layout
+    - https://github.com/servo/servo/pull/39519	(@minghuaw, #39519)	fonts: Initial draft of synthetic bold face for FreeType (#39519)
+      layout
+    - https://github.com/servo/servo/pull/39591	(@mrobinson, @Loirooriol, #39591)	layout: Clone static position rectangles when caching in `IndependentFormattingContext` (#39591)
+      layout; incremental
+    - https://github.com/servo/servo/pull/39681	(@minghuaw, @mrobinson, #39681)	fonts: Use OS/2 table to determine if font face is already bold when synthesizing bold face for FreeType platform (#39681)
+      layout
+    - https://github.com/servo/servo/pull/39633	(@minghuaw, #39633)	fonts: Add synthetic bold face support for Windows (#39633)
+      layout
+    - https://github.com/servo/servo/pull/39691	(@minghuaw, #39691)	fonts: Add synthetic bold face support for macos (#39691)
+      layout
+    - https://github.com/servo/servo/pull/39713	(@minghuaw, #39713)	fonts: Do not apply synthetic bold if font is already bold for webfont on FreeType platform (#39713)
+      layout
+    - https://github.com/servo/servo/pull/39608	(@arayaryoma, #39608)	fonts: Do not fall back to non-Japanese fonts for Han in Japanese language documents (#39608)
+      layout; better automatic font selection for japanese text on macOS and unix
+    - https://github.com/servo/servo/pull/39803	(@yezhizhen, #39803)	fonts: Fix compilation warning due to added fallback mechanism (#39803)
+      layout; font fallback for japanese text
+- perf
+    - https://github.com/servo/servo/pull/38991	(@mrobinson, @mukilan, #38991)	script: Skip running layout when only updating images or canvas (#38991)
+      perf
+    - https://github.com/servo/servo/pull/39629	(@jdm, #39629)	net: Share SVG font database between all image caches in the same process (#39629)
+      perf
+    - https://github.com/servo/servo/pull/39684	(@mrobinson, @delan, #39684)	compositor: Fix a performance regression from #39583 (#39684)
+      perf
+    - https://github.com/servo/servo/pull/39709	(@mrobinson, @delan, #39709)	libservo: Make `FormControl` responses completely asynchronous (#39709)
+      perf
+    - https://github.com/servo/servo/pull/39653	(@arihant2math, #39653)	storage: Port webstorage to sqlite3 (#39653)
+      perf
+    - https://github.com/servo/servo/pull/39509	(@Narfinger, #39509)	Script: Lazily transform the DOMString into Rust String instead of immediately. (#39509)
+      perf
+    - https://github.com/servo/servo/pull/39370	(@mukilan, #39370)	script: optimize `Element::create` for uncustomized built-in elements (#39370)
+      perf
+    - https://github.com/servo/servo/pull/38996	(@mrobinson, @mukilan, #38996)	script: Do not root nodes with animating images (#38996)
+      perf
+    - https://github.com/servo/servo/pull/39774	(@simonwuelker, #39774)	xpath: Avoid allocating hashmap when comparing NodeSet and String (#39774)
+      perf; faster comparison of node-sets with strings
+    - https://github.com/servo/servo/pull/39800	(@simonwuelker, #39800)	XPath: Flatten the AST to make it more flexible (#39800)
+      perf; preparation for optimising xpath queries
+    - https://github.com/servo/servo/pull/39845	(@simonwuelker, #39845)	script: Remove RefCell around document.animations (#39845)
+      perf; remove indirection over CSS animations
+- servoshell
+    - https://github.com/servo/servo/pull/39501	(@mrobinson, #39501)	servoshell: Do not override HiDPI ratio when taking screenshots (#39501)
+      servoshell; screenshots use current DPI of system
+    - https://github.com/servo/servo/pull/39314	(@Narfinger, @mukilan, #39314)	servoshell: Improve CLI help formatting (#39314)
+      servoshell; much more readable --help output
+- testing
+    - https://github.com/servo/servo/pull/39387	(@jschwe, #39387)	Add code-coverage option for `./mach test-unit` using llvm-cov (#39387)
+      testing
+- upgrade
+    - https://github.com/servo/servo/pull/39612	(@Loirooriol, #39612)	Upgrade Stylo to 2025-10-01 (#39612)
+      upgrade
+    - https://github.com/servo/servo/pull/39687	(@mrobinson, #39687)	deps: Upgrade to WebRender 0.68 (#39687)
+      upgrade
+- webcrypto
+    - https://github.com/servo/servo/pull/39477	(@kkoyung, #39477)	script: Migrate `digest` operation to use new normalization (#39477)
+      webcrypto
+    - https://github.com/servo/servo/pull/39646	(@kkoyung, #39646)	script: Migrate `sign`/`verify` operation to use new normalization (#39646)
+      webcrypto
+    - https://github.com/servo/servo/pull/39733	(@kkoyung, #39733)	script: Migrate `generateKey` operation to use new normalization (#39733)
+      webcrypto
+    - https://github.com/servo/servo/pull/39530	(@kkoyung, #39530)	script: Migrate `encrypt`/`decrypt` operation to use new normalization (#39530)
+      webcrypto
+    - https://github.com/servo/servo/pull/39760	(@kkoyung, #39760)	script: Migrate `importKey` operation to use new normalization (#39760)
+      webcrypto
+    - https://github.com/servo/servo/pull/39780	(@kkoyung, #39780)	script: Migrate `wrapKey`/`unwrapKey` operation to use new normalization (#39780)
+      webcrypto
+    - https://github.com/servo/servo/pull/39814	(@kkoyung, #39814)	script: Change type of [[algorithm]] internal slot of CryptoKey (#39814)
+      webcrypto
+    - https://github.com/servo/servo/pull/39805	(@kkoyung, #39805)	script: Migrate `deriveBits`/`get key length` operation to use new normalization (#39805)
+      webcrypto
+    - https://github.com/servo/servo/pull/39829	(@kkoyung, #39829)	script: Allow zero length in deriveBits operation of HKDF and PBKDF2 (#39829)
+      webcrypto
+    - https://github.com/servo/servo/pull/39827	(@kkoyung, #39827)	script: Register "get key length" operation for AES-KW (#39827)
+      webcrypto
+    - https://github.com/servo/servo/pull/39863	(@kkoyung, #39863)	script: Access internal slot of CryptoKey from HMAC Operations (#39863)
+      webcrypto
+    - https://github.com/servo/servo/pull/39806	(@arihant2math, @kkoyung, #39806)	webcrypto: Add JWK export for HMAC keys (#39806)
+      webcrypto
+    - https://github.com/servo/servo/pull/39894	(@kkoyung, #39894)	script: Simplify dictionary conversion in `SubtleCrypto` (#39894)
+      webcrypto
+    - https://github.com/servo/servo/pull/39918	(@kkoyung, #39918)	script: Correct block size in bits of SHA algorithms (#39918)
+      webcrypto
+    - https://github.com/servo/servo/pull/39369	(@kkoyung, #39369)	script: Add Ed25519 support to SubtleCrypto (#39369)
+      webcrypto
+    - https://github.com/servo/servo/pull/40253	(@kkoyung, #40253)	script: Implement import key operation for ECDH (#40253)
+      webcrypto
+- webdriver
+    - https://github.com/servo/servo/pull/39682	(@mrobinson, @delan, @yezhizhen, #39682)	webdriver: Apply script timeout to related IPC messaging as well (#39682)
+      webdriver
+    - https://github.com/servo/servo/pull/39620	(@yezhizhen, @mrobinson, #39620)	webdriver: Implement implicit wait for "Element retrieval" (#39620)
+      webdriver
+    - https://github.com/servo/servo/pull/39647	(@mrobinson, #39647)	script: Combine `WebDriverJSError` with `JavaScriptEvaluationError` and add the stack (#39647)
+      webdriver; script execution errors now include error message, location, and stack trace
+    - https://github.com/servo/servo/pull/39783	(@yezhizhen, #39783)	webdriver: Improve argument extraction of (async) script execution  (#39783)
+      webdriver; fixed bug preventing some older(?) webdriver libraries from passing web elements to Execute Script
+    - https://github.com/servo/servo/pull/39804	(@yezhizhen, #39804)	webdriver: Fix JS serialization for object with special key (#39804)
+      webdriver; fixed a bug causing errors when passing [web elements](https://w3c.github.io/webdriver/#dfn-web-elements) (and other JS objects with unusual keys) to [Execute Script](https://w3c.github.io/webdriver/#execute-script)