# November in Servo: monthly releases, context menus, parallel CSS parsing, and more!

DevFeed: [November in Servo: monthly releases, context menus, parallel CSS parsing, and more!](<https://devfeed.tech/articles/november-in-servo-monthly-releases-context-menus-parallel-css-parsing-and-more-3538.md>)

Original publisher: [Read original article](<https://servo.org/blog/2025/12/15/november-in-servo/>)

Author: The Servo Project Developers

Published: 2025-12-15T00:00:00Z

Content type: release

Language: en

Sources: [Servo Blog](<https://devfeed.tech/sources/servo-blog.md>)

Topics: [servo](<https://devfeed.tech/topics/servo.md>), [releases](<https://devfeed.tech/topics/releases.md>), [Web platform](<https://devfeed.tech/topics/web-platform.md>), [CSS](<https://devfeed.tech/topics/css.md>), [Android](<https://devfeed.tech/topics/android.md>), [API](<https://devfeed.tech/topics/api.md>), [SVG](<https://devfeed.tech/topics/svg.md>), [WebView](<https://devfeed.tech/topics/webview.md>)

Tags: [android](<https://devfeed.tech/tags/android.md>), [api](<https://devfeed.tech/tags/api.md>), [css](<https://devfeed.tech/tags/css.md>), [releases](<https://devfeed.tech/tags/releases.md>), [rust](<https://devfeed.tech/tags/rust.md>), [servo](<https://devfeed.tech/tags/servo.md>), [servo-engine](<https://devfeed.tech/tags/servo-engine.md>), [servo-rendering-engine](<https://devfeed.tech/tags/servo-rendering-engine.md>), [svg](<https://devfeed.tech/tags/svg.md>), [web](<https://devfeed.tech/tags/web.md>), [web-browser](<https://devfeed.tech/tags/web-browser.md>), [web-browser-engine](<https://devfeed.tech/tags/web-browser-engine.md>), [web-engine](<https://devfeed.tech/tags/web-engine.md>), [web-platform](<https://devfeed.tech/tags/web-platform.md>), [web-rendering-engine](<https://devfeed.tech/tags/web-rendering-engine.md>)

## AI overview

This November Servo release update covers Servo 0.0.3 and nightly builds. It reports context menus, Android vsync, new-tab light mode, expanded web platform and CSS support, enabled ResizeObserver, font variation improvements, SubtleCrypto algorithms, multiple rendering contexts for webviews, improved context-menu APIs, navigation methods, a simplified Servo API, and a fallback clipboard. A correction notes that ChaCha20-Poly1305 initially had only partial operation support.

## Source excerpt

Correction (2026-01-19) An earlier version of this post said that Servo now has full support for ChaCha20-Poly1305, but this was incorrect. We had only landed the 'importKey' and 'exportKey' operations. The 'encrypt', 'decrypt', and 'generateKey' options landed in the following month. Landing in Servo 0.0.3 and our November nightly builds, we now have context menus for links, images, and other web content (@atbrakhi, @mrobinson, #40434, #40501), vsync on Android (@mrobinson, #40306), light mode for the new tab page (@arihant2math, #40272), plus several web platform features: <video controls> (@rayguo17, #40578) <use> in SVG (@WaterWhisperer, #40684) ☢ 'font-optical-sizing' (@simonwuelker, #40829, #40861, #40884) 'brotli' in CompressionStream and DecompressionStream (@Taym95, #40842) 'display-p3-linear' in CSS color() and color-mix() (@Loirooriol, #40525) calc() now works in grid layout (@nicoburns, #34846) ResizeObserver is now enabled by default (@jdm, #40378) Font variations are now applied in 'font-weight' and 'font-stretch' (@simonwuelker, #40867), fixing a rendering issue in the Web Engines Hackfest website. @kkoyung has landed some huge improvements in the SubtleCrypto API, including some of the more modern algorithms in this WICG draft, and a fix for constant-time base64 (@kkoyung, #40334). We now have full support for SHA3-256, SHA3-384, SHA3-512 (@kkoyung, #40765), cSHAKE128, cSHAKE256 (@kkoyung, #40832), Argon2d, Argon2i, Argon2id, ChaCha20-Poly1305, ECDH, ECDSA, and X25519: Algorithm deriveBits exportKey generateKey importKey sign verify Argon2d #40936 n/a n/a #40932 n/a n/a Argon2i #40936 n/a n/a #40932 n/a n/a Argon2id #40936 n/a n/a #40932 n/a n/a ChaCha20-Poly1305 n/a #40948 n/a #40948 n/a n/a ECDH #40333 #40298 #40305 #40253 n/a n/a ECDSA n/a #40536 #40553 #40523 #40591 #40557 X25519 #40497 #40421 #40480 #40398 n/a n/a <details> now fires 'toggle' events (@lukewarlow, #40271), and <details name> is now exclusive, like radio buttons (@simonwuelker, #