[Webkit-unassigned] [Bug 201747] New: Element stacking order inside svg is ignored for <video> in foreignObject

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201747

            Bug ID: 201747
           Summary: Element stacking order inside svg is ignored for
                    <video> in foreignObject
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: samuel.wemyss at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 378699

  --> https://bugs.webkit.org/attachment.cgi?id=378699&action=review

Testcase

Similar to https://bugs.webkit.org/show_bug.cgi?id=201110 it seems, though this is only inside an svg whereas that bug report is about element stacking with external html elements and svg foreignObject.

See the attached testcase for an example.
Currently safari renders video elements in a foreignObject above all other elements in that svg.
It should respect element stacking order.

Works correctly in Firefox, Chrome appears to have the same bug.

Also ignore the scaling issue of a video inside a foreignObject, I see that is already covered by this report https://bugs.webkit.org/show_bug.cgi?id=200382

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