CSS

• Added support for the x resolution unit (r282396)
• Added support for self-start, self-end, start, end, left, and right values in positional alignment (r282267, r282078, r281840)
• Added support for percentages in the scale() transform functions, and the scale property (r282144)
• Added support for sin(), cos(), tan(), e, and pi in calc() (r282162)
• Added support for text-decoration-skip-ink (r282397)
• Added support for input-security (r282750)
• Changed URLs in CSS variables to be resolved against the base URL of the stylesheet, not the document (r282403)
• Fixed incorrect stacking order with an absolutely positioned and negative z-index <div> with a canvas child (r281913)
• Fixed absolute positioning with orthogonal writing modes (r281995)
• Fixed right-relative and bottom-relative values in background-position-x and background-position-y (r282234)
• Fixed computed style for transform-origin on SVG boxes (r282379)
• Fixed incorrect vertical position in table layout when the inline level box has 0px height (r282256)
• Fixed changing the border size on rows with border-collapse not redrawing (r282266)
• Fixed position: sticky used within table cells (r282201)
• Fixed incorrectly calculated position: sticky constraints when the scrolling container has padding and borders (r282138)
• Fixed overflow to be computed with the actual logical bottom in CSS Grid (r282463)
• Fixed RTL for an out of flow child in CSS Grid (r282340)
• Fixed an interoperability issue in margin collapsing with overflow: hidden elements (r282085)
• Fixed linear gradient getting drawn incorrectly sometimes (r282443)
• Updated transform-origin to not accept four lengths (r282359)

CSS Cascade Layers

• Added initial support for CSS Cascade Layers available in the Experimental Features menu:
  • Added support for computing the order correctly for late added sublayers (r281798)
  • Supported layer argument in @import rules (r281928)

CSS Font Loading API

• Updated the implementation of the CSS Font Loading API to be closer to the spec and other browsers:
  • Fixed CSSFontFaceSrcValue.cssText to be quoted consistently with other browsers (r282442)
  • Fixed CSSFontFaceSet.clear() to not clear CSS-connected members (r281842)
  • Updated FontFaceSet methods that need to react to style changes (r282016, r282015, r282015, r282261, r282204)
  • Updated FontFaceSet.add() to throw when called on a CSS-connected font (r281951)

Accessibility

• Fixed blank braille display in contenteditable elements when the field is followed by another element (r281920)
• Made PDFs loaded via <embed> accessible (r282358)

JavaScript

• Enabled Object.hasOwn (r281835)
• Implemented Temporal.PlainTime behind the flag --useTemporal=1 (r282125)
• Implemented Temporal.TimeZone behind the flag --useTemporal=1 (r282018)
• Implemented Temporal.Duration behind the flag --useTemporal=1 (r281838)
• Implemented self.structuredClone() (r281808)
• Implemented Object.hasOwn() (r281799)
• Updated Intl.Locale weekendInfo to list all weekend days instead of range to follow to the latest spec change (r282257)
• Optimized JSON.stringify for objects (r282707)
• Optimized JSON.parse object creation (r282468)

Web API

• Added basic support for Storage API (r282130)
• Added support for ServiceWorkerGlobalScope.serviceWorker (r281854)
• Added handling for non-fully active documents in navigator.share() / navigator.canShare() (r282282)
• Enabled BroadcastChannel (r282426)
• Enabled Cross-Origin-Opener-Policy / Cross-Origin-EmbedderPolicy headers support (r282105, r282246)
• Enabled SharedArrayBuffer support when COOP/COEP headers are used (r281832)
• Fixed scrollbars on pointer-events: none element still intercepting events (r281991)
• Implemented top-origin and frame-origin partitioning for BroadcastChannel (r282105, r282366)
• Implemented the borderBoxSize and contentBoxSize parts of ResizeObserver (r282441)
• Implemented navigation reporting for Cross-Origin-Opener-Policy (r282305)
• Implemented getClientRects() for SVG elements (r282316)
• Updated to always fetch the first manifest if provided (r282026)
• Updated to preserve color space when creating ImageBuffers for ImageBitmaps (r282696)

WebRTC

• Added support for RTCError and RTCErrorEvent (r282199)
• Added support for RTCDataChannel closing event (r282198)
• Added support for RTCSctpTransport (r282197)
• Updated timing of RTCPeerConnection descriptions update to align with the WebRTC spec (r282217)
• Updated signaling state check when applying a local or remote description to align with the WebRTC spec (r281985)
• Updated getDisplayMedia to capture at the constrained size if possible (r281880)

Media

• Fixed the progress bar moving when playback stops (r282374)
• Fixed an incorrect number of frames returned if the decoding frame rate doesn’t match the original in WebM (r282196)
• Removed Web Audio canPlayType() workaround that made it reports false negatives (r282137)

WebGL

• Fixed image-rendering: crisp-edges for WebGL canvases (r282335)

Web and App Extensions

• Added the extension’s icon to extension URL tabs for both app and web extensions
• Added the extension name as the title of tabs when an app extension page and does not specify a title