[Webkit-unassigned] [Bug 243363] New: Prevent background propagation on <html> with layout containment

Fri Jul 29 19:43:27 PDT 2022

https://bugs.webkit.org/show_bug.cgi?id=243363

            Bug ID: 243363
           Summary: Prevent background propagation on <html> with layout
                    containment
           Product: WebKit
           Version: Safari 14
          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

WPTs:

css/css-contain/contain-html-bg-001.html
css/css-contain/contain-html-bg-002.html
css/css-contain/contain-html-bg-003.html

The results make it pretty clear what this is about:

https://wpt.fyi/analyzer?screenshot=sha1%3A93c3c4c555b8fa38035d23b475072ba6c920aaf7&screenshot=sha1%3A422ed5a9b8fce6673dbb700360cefb1ba06af8fa

If <html> has a fixed size and contain: layout, the background shouldn't spread above that size.

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