[Webkit-unassigned] [Bug 225034] New: Exclude creating a containing block for root element on will-change: filter/backdrop-filter

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225034

            Bug ID: 225034
           Summary: Exclude creating a containing block for root element
                    on will-change: filter/backdrop-filter
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ntim at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

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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