300877 2025-10-16 02:16:03 -0700 REGRESSION: View Transitions cause page flash when opening/closing components 2025-10-21 19:26:00 -0700 1 1 1 Unclassified WebKit Layout and Rendering Safari 18 All iOS 26 RESOLVED DUPLICATE 299091 https://bugs.webkit.org/show_bug.cgi?id=297845 https://4057-branch-to-display-view-transition-bug-safari.poki.io/ InRadar P2 Major --- 1 pareenv webkit-unassigned bfulgham koivisto mattwoodrow ntim simon.fraser webkit-bug-importer zalan oldest_to_newest 2151593 0 pareenv 2025-10-16 02:16:03 -0700 SUMMARY: When using the View Transitions API to animate a side panel component mounting/unmounting, the page exhibits multiple white flashes - some across the entire screen and some across parts of components - instead of a smooth opening and closing transition. This works correctly in Chrome and worked in Safari 18.0.6, but broke after upgrading. EXPECTED RESULT: Only the side panel element should animate smoothly (slide in/out). The rest of the page should remain static during both opening and closing transitions. ACTUAL RESULT: The page exhibits multiple white flashes during both opening and closing transitions - some flashes cover the entire screen while others flash across individual component areas. These flashes are erratic and unpredictable. Have even tried disabling root animations in CSS, but that did nothing. REGRESSION: - Working: Safari 18.0.6 - Broken: Safari 18.2+ (started with "liquid glass" update) - Also broken: Safari 18.2.6+ - Still works: Chrome (all versions with View Transitions support) STEPS TO REPRODUCE: 1. Visit https://4055-viewtransition-safari.poki.io 2. Open and close the side panel by clicking on the search icon in the pill on the top left corner 3. Witness the flashes happen across the screen when you open and close it ADDITIONAL NOTES: - Related to bug #297845 (View Transitions flickering issues): https://bugs.webkit.org/show_bug.cgi?id=297845 - All standard View Transitions best practices have been implemented 2151595 1 pareenv 2025-10-16 02:32:14 -0700 This is for the company Poki, www.poki.com (we have now disabled it for iOS devices - so you will only be able to view the on the URL added) 2151597 2 pareenv 2025-10-16 02:36:37 -0700 The URL in the main description is no longer available, please use this URL instead: https://4057-branch-to-display-view-transition-bug-safari.poki.io/. 2151672 3 ap 2025-10-16 08:34:26 -0700 Thank you for the report! Could you please confirm the version numbers? Safari 18.2 is from December 2024, long before Liquid Glass. 2151979 4 pareenv 2025-10-17 01:02:22 -0700 (In reply to Alexey Proskuryakov from comment #3) > Thank you for the report! Could you please confirm the version numbers? > Safari 18.2 is from December 2024, long before Liquid Glass. Hi Anton, thank you for your response! The version I'm getting the bug on is this: Version 26.0.1 (21622.1.22.11.15) 2152252 5 webkit-bug-importer 2025-10-17 17:07:31 -0700 <rdar://problem/162902414> 2153212 6 mattwoodrow 2025-10-21 19:25:55 -0700 Thanks for reporting this! This got fixed in bug 299091, should be in a Safari release before too long. 2153213 7 mattwoodrow 2025-10-21 19:26:00 -0700 *** This bug has been marked as a duplicate of bug 299091 ***