225034 2021-04-25 12:34:49 -0700 Exclude creating a containing block for document root element (<html>) on will-change: filter/backdrop-filter 2022-08-13 08:09:42 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=243571 http://wpt.live/css/css-will-change/will-change-fixedpos-cb-003.html InRadar P2 Normal --- 1 ntim webkit-unassigned ahmad.saleem792 bfulgham gsnedders simon.fraser webkit-bug-importer zalan oldest_to_newest 1754043 0 ntim 2021-04-25 12:34:49 -0700 will-change: filter/backdrop-filter should not create a containing block on the root element. WPT: https://webkit-search.igalia.com/webkit/source/LayoutTests/imported/w3c/web-platform-tests/css/css-will-change/will-change-fixedpos-cb-003.html Spec: https://drafts.fxtf.org/filter-effects/#FilterProperty > A value other than none for the filter property results in the creation of a containing block for absolute and fixed positioned descendants unless the element it applies to is a document root element in the current browsing context. The list of functions are applied in the order provided. 1754221 1 simon.fraser 2021-04-26 09:25:39 -0700 The root is always a containing block so I'm confused by this bug. 1754234 2 zalan 2021-04-26 09:39:49 -0700 (In reply to Simon Fraser (smfr) from comment #1) > The root is always a containing block so I'm confused by this bug. I looked at the test case and apparently the root here means the <html> element and not the Initial Containing Block. Please rename the bug. 1756068 3 webkit-bug-importer 2021-05-02 12:35:12 -0700 <rdar://problem/77437740> 1889153 4 gsnedders 2022-08-05 10:22:24 -0700 *** Bug 243571 has been marked as a duplicate of this bug. ***