[Webkit-unassigned] [Bug 197150] New: Clarify normal flow vs. stacking layers in RenderLayer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197150

            Bug ID: 197150
           Summary: Clarify normal flow vs. stacking layers in RenderLayer
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

collectZOrderLayers() has logic that says:

bool stacking = isStackingContext();
if (!isNormalFlowOnly())
...

but it's no clear if a layer can be neither stacking nor normal flow only.

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