[Webkit-unassigned] [Bug 150790] New: Adding CSS opacity to a SVG foreignobject child destroys layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150790

            Bug ID: 150790
           Summary: Adding CSS opacity to a SVG foreignobject child
                    destroys layout
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: me at andrewray.me
                CC: zimmermann at kde.org

The Webkit SVG foreignobject implementation is not in a good place, as mentioned by other committers and indicated by the prevalence of bugs around foreignobject, transformations, etc.

This one took me by quite a surprise. You can see it clearly enough in this codepen. In the CSS column, change the opacity line with the comment from 1.0 to 0.9 and observe how the layout is destroyed.

http://codepen.io/andrewray/pen/rOKPBx?editors=110

How CSS opacity inside an element breaks parent layout is an interesting question. Setting opacity to 1.0 does nothing, but setting opacity to anything else breaks layout.

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