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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Various RenderLayer issue with <dialog>"
   href="https://bugs.webkit.org/show_bug.cgi?id=234980#c2">Comment # 2</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Various RenderLayer issue with <dialog>"
   href="https://bugs.webkit.org/show_bug.cgi?id=234980">bug 234980</a>
              from <span class="vcard"><a class="email" href="mailto:simon.fraser@apple.com" title="Simon Fraser (smfr) <simon.fraser@apple.com>"> <span class="fn">Simon Fraser (smfr)</span></a>
</span></b>
        <pre>These are the ancestor tree walks I've found that need thinking about in terms of top layer:

    setAncestorChainHasSelfPaintingLayerDescendant
    setAncestorChainHasVisibleDescendant

    SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem

    enclosingScrollableLayer()

    RenderElement::moveLayers
    RenderElement::findNextLayer

    traverseAncestorLayers
    enclosingFragmentedFlowAncestor</pre>
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