NEW 225034
Exclude creating a containing block for document root element (<html>) on will-change: filter/backdrop-filter 
https://bugs.webkit.org/show_bug.cgi?id=225034
Summary Exclude creating a containing block for document root element (<html>) on wil...
Tim Nguyen (:ntim)
Reported 2021-04-25 12:34:49 PDT
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.
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Simon Fraser (smfr)
Comment 1 2021-04-26 09:25:39 PDT
The root is always a containing block so I'm confused by this bug.
alan
Comment 2 2021-04-26 09:39:49 PDT
(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.
Radar WebKit Bug Importer
Comment 3 2021-05-02 12:35:12 PDT
<rdar://problem/77437740>
Sam Sneddon [:gsnedders]
Comment 4 2022-08-05 10:22:24 PDT
*** Bug 243571 has been marked as a duplicate of this bug. ***
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