WebRTC

• Fixed getUserMedia with an ideal deviceId constraint to always select the correct device (r241489)
• Made navigator.mediaDevices SecureContext (r241602)

Web API

• Fixed WebSocket to not fire events after being stopped (r241599)
• Fixed Same-Site Lax cookies to be sent with cross-site redirect from a client-initiated load (r241918)
• Updated the MIME type parser (r241863)

CSS Grid

• Changed to handle indefinite percentages in fit-content() (r241746)

Accessibility

• Fixed HTML5 <footer> tag to be read as an ARIA Landmark to VoiceOver (r242051)
• Fixed incorrectly mapping the <meter> element to progressbar (r241989)

Media

• Fixed setting fullscreen pseudo-classes outside of root when entering fullscreen from inside of a shadow root (r241484)
• Changed inline WebVTT styles to start with ::cue (r241608)

Web Inspector

• Added emulation of user gestures from Web Inspector console (r241633)
• Added built-in accessibility tests to the Audit tab (r241639)
• Added a macOS user-agent option in the device settings menu (r241870)
• Added an experimental setting to merge Resources and Debugger tabs into a single Sources tab (r242049)
• Changed how selected items are tracked in trees and tables to improve performance (r241652)
• Changed Command-/ (⌘/) to toggle the edited property in the Styles sidebar (r242063)
• Changed typing ; to not focus on the next property when there’s open parenthesis or open comment in the Styles sidebar (r241740)
• Changed clicking a CSS property or selector to always select its text in the Styles sidebar (r241980)
• Fixed all actions after an offscreen path modification getting marked as offscreen path errors in the Canvas tab (r241616)
• Fixed an issue where taking a second Canvas recording wouldn’t select the Initial State of the new recording (r241601)
• Fixed clearing the selection when dragging a selection outside of the selected element in the Console (r242078)
• Fixed the dim appearance of commas in CSS selectors for dark mode (r241638)
• Fixed the DOM Content Loaded blue marker for dark mode (r241975)
• Fixed the Network Overview Graph segments box shadow for dark mode (r242072)
• Fixed node-specific event breakpoints to get cleared or recalculated on navigation (r241874)
• Fixed highlighting a node when hovering inside an object preview (r242076)
• Fixed the navigation sidebar showing “No Search Results” when a slow search is in progress (r242080)
• Fixed Scripts Timeline loading indicator margins in right-to-left mode (r241857)
• Fixed valid values in style attributes getting reported as unsupported property values in the Styles sidebar (r241623)
• Improved the Scripts timeline on-going-recording in dark mode (r241757)
• Improved categorization of JavaScript Class instances in the Heap Snapshot instances view (r241787)
• Provided a way to avoid a Timeline recording auto-stop on reload (r241750)
• Provided a way to make searches case-sensitive or use a regular expression (r242018)

Bug Fixes

• Fixed a bug that caused loading on some sites to hang in Safari Technology Preview (r241658)

Safari app Extensions

• Made the window.safari object available in frames opened to safari-extension:// resources