[Webkit-unassigned] [Bug 272727] New: Sometimes the contents of a visibility:hidden iframe become visible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272727

            Bug ID: 272727
           Summary: Sometimes the contents of a visibility:hidden iframe
                    become visible
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

If an iframe is `visibility:hidden`, we stop compositing it, which allows the contents to be hidden. However, if it's composited for other reasons (e.g. position:fixed) then we can show the contents when they should be hidden.

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