[Webkit-unassigned] [Bug 229488] New: Re-generalize top layer element concept

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229488

            Bug ID: 229488
           Summary: Re-generalize top layer element concept
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: koivisto at iki.fi, ntim at apple.com,
                    simon.fraser at apple.com

After https://commits.webkit.org/r281548, the concept of top layer is confined to dialog element.
Re-generalize this concept for all elements so that we can use it in the full screen element.

We'd introduce a new node flag to avoid incurring any perf cost.

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