Servo 0.7.0 Released with New Web Features, DOM APIs, and SpiderMonkey Update

New Web Platform Features and DOM APIs

Servo 0.7.0 introduces several new web platform features, expanding its compatibility and rendering capabilities. These additions include support for the `:checked` pseudoclass, the `user-select` property, the `<progress>` element, CSS typed arithmetic, the `alpha()` CSS function, and the `font-width` property.

The release also brings a range of new DOM APIs. Notable additions include `parentRule` on `CSSRule` and `CSSStyleDeclaration`, `version` on `HTMLHtmlElement`, `getComposedRanges()` and `direction` on `Selection`, `baseURL` on `CSSStyleSheet`, and `getContextAttributes()` on `CanvasRenderingContext2D` and `OffscreenCanvasRenderingContext2D`. Support for `roundRect()` on `CanvasRenderingContext2D` and the `MLKEM768-X25519` algorithm for WebCrypto have also been integrated.

Developer Tool and Core Component Updates

The developer tools console in Servo now eagerly evaluates JavaScript inputs, providing faster feedback for developers. This change aims to improve the debugging and development workflow within the browser engine.

Core components have also been updated, with Servo upgrading to SpiderMonkey v153.3 and mozangle v0.7. Both of these updated versions include fixes for security bugs that were reported upstream, enhancing the overall security posture of the Servo engine.

Accessibility and WebGL Improvements

Accessibility features in Servo have been enhanced. The accessibility tree now reports geometry bounds for inline elements and performs less work when responding to DOM changes. Additionally, elements with `display: none` are now correctly reported as hidden, improving screen reader and assistive technology compatibility.

Conformance improvements have been made to Servo's WebGL2 implementation, addressing multiple aspects to ensure better adherence to the WebGL2 standard. This work contributes to more reliable and consistent rendering of 3D graphics within Servo.