310239 2026-03-18 19:51:44 -0700 Fixed boxes anchored to children of sticky boxes should stick 2026-03-31 01:19:42 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Local Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 291856 1 fantasai.bugs fantasai.bugs bfulgham simon.fraser webkit-bug-importer zalan oldest_to_newest 2191556 0 fantasai.bugs 2026-03-18 19:51:44 -0700 Testcase: https://knowler.dev/demos/Ats2b5t?codepen <div id="sticky">Sticky <div id="anchor">Anchor</div> <div id="anchored" popover="auto">Anchored</div> </div> <div id="content"></div> <script> anchored.showPopover(); </script> <style> #sticky { position: sticky; inset-block-start: 0; } #anchor { anchor-name: --anchor; } #anchored { position-anchor: --anchor; position-area: block-end span-inline-start; margin-block-start: 8px; } /* Presentation-only */ :root { color-scheme: dark; font-family: system-ui; background-image: linear-gradient(to bottom, RoyalBlue, MediumSeaGreen); } body { margin: 0; } #sticky { display: flex; justify-content: space-between; padding: 16px; background-color: DeepPink; font-weight: 600; } #content { block-size: 2000px; } </style> 2191557 1 webkit-bug-importer 2026-03-18 19:51:51 -0700 <rdar://problem/172884148> 2193983 2 478820 fantasai.bugs 2026-03-26 09:45:07 -0700 Created attachment 478820 simplified testcase 2194985 3 fantasai.bugs 2026-03-29 21:32:02 -0700 Pull request: https://github.com/WebKit/WebKit/pull/61656 2195281 4 ews-feeder 2026-03-30 14:19:09 -0700 Committed 310255@main (344b0fc11db6): <https://commits.webkit.org/310255@main> Reviewed commits have been landed. Closing PR #61656 and removing active labels. 2195467 5 ews-feeder 2026-03-31 01:19:42 -0700 Committed 305413.601@safari-7624-branch (f0f99c394805): <https://commits.webkit.org/305413.601@safari-7624-branch> Reviewed commits have been landed. Closing PR #4856 and removing active labels. 478820 2026-03-26 09:45:07 -0700 2026-03-26 09:45:07 -0700 simplified testcase wpt.html text/html 744 fantasai.bugs CjxkaXYgaWQ9InN0aWNreSI+U3RpY2t5CiAgPGRpdiBpZD0iY2hpbGQiPlN0aWNreSBDaGlsZDwv ZGl2Pgo8L2Rpdj4KPGRpdiBjbGFzcz0iYW5jaG9yZWQgc3RpY2t5Ij5BbmNob3JlZCB0byBTdGlj a3k8L2Rpdj4KPGRpdiBjbGFzcz0iYW5jaG9yZWQgc3RpY2t5LWNoaWxkIj5BbmNob3JlZCB0byBD aGlsZDwvZGl2PgoKPHN0eWxlPgojc3RpY2t5IHsKICBwb3NpdGlvbjogc3RpY2t5OwogIGluc2V0 LWJsb2NrLXN0YXJ0OiAwOwogIGJhY2tncm91bmQ6IERlZXBQaW5rOwogIGJvcmRlcjogMTBweCBz b2xpZCB5ZWxsb3c7CiAgYW5jaG9yLW5hbWU6IC0tc3RpY2t5Owp9CgojY2hpbGQgewogIGFuY2hv ci1uYW1lOiAtLXN0aWNreS1jaGlsZDsKICBiYWNrZ3JvdW5kOiBibHVlOwogIG1hcmdpbi1sZWZ0 OiA1MCU7Cn0KCi5hbmNob3JlZCB7CiAgcG9zaXRpb246IGFic29sdXRlOwogIHBvc2l0aW9uLWFy ZWE6IGJsb2NrLWVuZCBjZW50ZXI7CiAgYmFja2dyb3VuZDogYXF1YTsKfQouYW5jaG9yZWQuc3Rp Y2t5IHsKICBwb3NpdGlvbi1hbmNob3I6IC0tc3RpY2t5Owp9Ci5hbmNob3JlZC5zdGlja3ktY2hp bGQgewogIHBvc2l0aW9uLWFuY2hvcjogLS1zdGlja3ktY2hpbGQ7Cn0KCjpyb290IHsKICBiYWNr Z3JvdW5kLWltYWdlOiBsaW5lYXItZ3JhZGllbnQodG8gYm90dG9tLCBSb3lhbEJsdWUsIE1lZGl1 bVNlYUdyZWVuKTsKICBwYWRkaW5nOiA0MHB4OwogIGJsb2NrLXNpemU6IDIwMCU7Cn0KCjwvc3R5 bGU+