[Webkit-unassigned] [Bug 90866] New: Add User Agent Shadow DOM to FormControlElement just before adding User Shadow DOM.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90866

           Summary: Add User Agent Shadow DOM to FormControlElement just
                    before adding User Shadow DOM.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: shinyak at chromium.org
            Blocks: 77937


User Agent Shadow DOM might be added to FormControlElement for Validation Message lazily.
Since our implementation assumes that the User Agent Shadow DOM is the oldest, we don't allow a user to add Author Shadow DOM yet.

We should add User Agent Shadow DOM just before a user add Author Shadow DOM.
It will allow a user to add Author Shadow DOM.

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