276727 2024-07-17 12:16:14 -0700 Implement `overlay` CSS property and new top layer exit algorithm 2026-03-03 14:41:22 -0800 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=275184 InRadar P2 Normal --- 1 ntim ntim agafvv ahmad.saleem792 arrow_actions.7g florian ian imbashenk jeroen.zwartepoorte kileras koivisto ryan spark343 webkit-bug-importer oldest_to_newest 2046773 0 ntim 2024-07-17 12:16:14 -0700 Might be necessary for web compat at this point... 2046774 1 webkit-bug-importer 2024-07-17 12:16:35 -0700 <rdar://problem/131944330> 2046991 2 ahmad.saleem792 2024-07-18 05:54:20 -0700 https://drafts.csswg.org/css-position-4/#overlay 2067778 3 ntim 2024-10-14 11:06:27 -0700 *** Bug 280983 has been marked as a duplicate of this bug. *** 2069956 4 ntim 2024-10-22 18:14:25 -0700 *** Bug 252234 has been marked as a duplicate of this bug. *** 2102167 5 jeroen.zwartepoorte 2025-03-10 23:50:04 -0700 Please mark https://bugs.webkit.org/show_bug.cgi?id=289474 as a duplicate as well. 2102433 6 karlcow 2025-03-11 19:29:18 -0700 *** Bug 289474 has been marked as a duplicate of this bug. *** 2107385 7 ntim 2025-03-31 05:51:07 -0700 *** Bug 289473 has been marked as a duplicate of this bug. *** 2134458 8 ntim 2025-08-05 11:53:05 -0700 *** Bug 296925 has been marked as a duplicate of this bug. *** 2144125 9 ntim 2025-09-18 14:32:28 -0700 *** Bug 299081 has been marked as a duplicate of this bug. *** 2148647 10 jeroen.zwartepoorte 2025-10-06 00:50:16 -0700 This issue is not just about animating closing top layer elements. It is also necessary to fix unwanted behavior: When a popover parent element is translated, the popover will suddenly "jump" when it exits the top layer. Since you may not have control over the parent element that is translated, the only fix is to have the popover remain in the top layer *until* it is no longer visible. See https://codepen.io/dianabroeders/pen/ByjpqWE?editors=1100 for a reproduction. 2156783 11 ap 2025-11-05 17:19:23 -0800 *** Bug 301960 has been marked as a duplicate of this bug. *** 2186743 12 ntim 2026-03-03 14:41:22 -0800 Pull request: https://github.com/WebKit/WebKit/pull/59831