Fixed a style resolution loop that occurred when a position-try box was inside a display:

Overview
Safari 26.3 is available for iOS 26.3, iPadOS 26.3, visionOS 26.3, macOS 26.3, macOS Sequoia, and macOS Sonoma

CSS
Resolved Issues

• Fixed a style resolution loop that occurred when a position-try box was inside a display: none ancestor. (163691885)
• Fixed an issue where anchor-positioned elements repeatedly transitioning from display: block to display: none cause position jumps during animation. (163862003)
• Fixed an issue where fixed-positioned boxes using position-area were incorrectly included in the scrollable containing block calculation. (164017310)
• Fixed an issue where text-decoration: underline was rendered too high when text-box-trim was applied to the root inline box. (165945326)
• Fixed a multi-column layout issue where the widows and text-indent properties are applied cause an incorrect indent on the portion of the paragraph that flows into the next column. (165945497)
• Fixed an issue where CSS cursors like move, all-scroll, ew-resize, and ns-resize did not display correctly. (166731882)

DOM
Resolved Issues

• Fixed incorrect timestamp handling and switched to use the raw touch timestamp. (164262652)

HTTP
New Features

• Added support for Zstandard content encoding in Safari 26.3 for iOS, iPadOS, visionOS, and macOS 26.3. (157682304)

Media
New Features

• Fullscreen video playback on visionOS now automatically dims your surroundings to help you focus on the content. (164032895)

Resolved Issues

• Fixed an issue where the fullscreen button in visionOS inline video controls did not visually indicate interactivity by extending the glow effect to all button.circular elements. (164259201)
• Fixed Video Viewer mode for iframe videos on macOS. (164484608)
• Fixed an issue where Safari could not play live videos when the sourceBuffer content is removed and re-added causing the seek to not complete. (165628836)

Rendering
Resolved Issues

• Fixed an issue where positioned or transformed elements containing HDR JPEGs with gain maps would incorrectly render as SDR. (163517157)

Safe Browsing
Resolved Issues

• Fixed a bug where if Safe Browsing queried for an entry on the Public Suffix List, and a Safe Browsing vendor responded that the whole effective TLD was unsafe, the whole site would be marked as unsafe. (168155375)

Web API
New Features

• Added support for firing an AbortSignal when a NavigateEvent is aborted. (164125292)