Web Inspector

• Elements tab
  • Added showing grid and flex overlays when in element selection and highlighting elements (259989@main, 260061@main)
  • Prevented showing ::backdrop rules for elements without a backdrop (259894@main)
• Sources tab
  • Added experimental feature to enable aggressive limits on the length of lines that are formatted for sources (259603@main)

CSS

• Fixed dynamically setting the width of tables with fixed layout and auto width (260143@main)
• Improved serialization of mask and background properties (260157@main)
• Made -webkit-image-set() an alias of image-set() (259994@main)
• Made margin-trim trim collapsed margins at block-start and block-end sides (259734@main)

JavaScript

• Fixed String#toWellFormed to return stringified value (260043@main)
• Disabled import-assertion based on TC39’s stage-2 downgrade (259795@main)
• Disabled wasm tail-calls because of some issues (259801@main)
• Made JavaScript to Wasm function calls faster (259584@main)
• Optimized parseInt(number) case (259939@main)
• Optimized RegExp performance by enhancing Boyer-Moore search (259941@main, 260054@main, 260142@main)
• Optimized String constructor calls (260146@main)

ResizeObserver

• Fixed the initial last reported size of ResizeObservation (259673@main)

Rendering

• Fixed content truncation when text-overflow is ellipsis (259850@main)
• Fixed table cells, rows, sections or column (groups) to support margins (259955@main)
• Fixed the margin for summary on details for right-to-left mode (260063@main)
• Fixed inline text boxes containing Zero Width Joiner, Zero Width Non-Joiner, or Zero Width No-Break Space characters to not use simplified text measuring (259618@main)

Web Animations

• Fixed animating two custom property list values with mismatching types to use a discrete animation (259557@main)
• Fixed the animation of color list custom properties when iterationComposite is incorrect (259761@main)
• Fixed composite of implicit keyframes for CSS Animations to be replace (259739@main)
• Fixed keyframes to be recomputed if a custom property registration changes (259737@main)
• Fixed keyframes to be recomputed when bolder or lighter is used on a font-weight property (259740@main)
• Fixed keyframes to be recomputed when a parent element changes value for a custom property set to inherit (259812@main)
• Fixed keyframes to be recomputed when a parent element changes value for a non-inherited property set to inherit (259645@main)
• Fixed keyframes to be recomputed when the currentcolor value is used on color related properties (259736@main)
• Fixed keyframes to be recomputed when the currentcolor value is used on a custom property (259808@main)
• Fixed line-height to not transition from the default value to a number (260028@main)
• Fixed animations without a browsing context to be idle (260101@main)
• Fixed an @keyframes rule using an inherit value to update the resolved value when the parent style changes (259631@main)
• Fixed non-inherited custom property failing to inherit from parent when inherit is set (259809@main)

WebAuthn

• Fixed conditional passkey requests not cancelling correctly after AbortController.abort() (259754@main)

Media

• Fixed distorted audio after getUserMedia when playing with AudioWorkletNode (259964@main)
• Fixed getDisplayMedia to not build a list of every screen and window (259969@main)

HTTP

• Enabled Clear-Site-Data HTTP header support (259970@main)
• Added support for Clear-Site-Data: "executionContext" (259940@main)

Editing

• Turned on the feature to make selection return a live range from getRangeAt and throw errors as specified (259904@main)
• Fixed incorrect text caret placement when right-to-left text starts with whitespace (259868@main)

Web API

• Added optional submitter parameter to FormData constructor (259558@main)
• Added canvas.drawImage support for SVGImageElement (259869@main)
• Implemented focus fixup rule so that focused elements are blurred when they are no longer focusable due to style changes (260067@main)
• Fixed <link> elements with media queries that do not match to not block visually first paint
  (259963@main)
• Fixed a Fetch bug with empty header values in Headers objects with “request-no-cors” guard (260066@main)
• Fixed caret move by line when padding-top is set (259906@main)
• Fixed individually paused or playing animations not being effected by Play All Animations and Pause All Animations (259971@main)
• Fixed find on page failing to show results in PDFs in Safari (259655@main)
• Fixed navigation within an iframe not exiting fullscreen for a parent iframe element (260024@main)
• Fixed scrolling away from and back to an individually playing animation causing it to be incorrectly paused (259910@main)

Safari Web Extensions

• Fixed Cross-Origin-Resource-Policy blocking fetch from extensions (259976@main)