[Webkit-unassigned] [Bug 258916] New: Avoid unnecessary tree traversal in customElements.define

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258916

            Bug ID: 258916
           Summary: Avoid unnecessary tree traversal in
                    customElements.define
           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

customElements.define currently always traverses the entire document to find upgrade candidates.
Avoid this traversal whenever possible by keeping track of the number of upgrade candidates.

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