[Webkit-unassigned] [Bug 161570] New: Update the semantics of defined-ness of custom elements per spec changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161570

            Bug ID: 161570
           Summary: Update the semantics of defined-ness of custom
                    elements per spec changes
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: cdumez at apple.com
            Blocks: 154907

There has some changes to the way a custom element becomes :defined.
Namely, when a custom element constructor throws an exception,
the element is no longer considered as defined.

Furthermore, we should not try to upgrade such an element
when it's inserted back into a document.

Update our implementation of custom elements per these spec changes.

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