[Webkit-unassigned] [Bug 222657] New: adoptNode() discards native shadow DOM roots, breaking several input and media elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222657

            Bug ID: 222657
           Summary: adoptNode() discards native shadow DOM roots, breaking
                    several input and media elements
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: javan at javan.us

Created attachment 422090

  --> https://bugs.webkit.org/attachment.cgi?id=422090&action=review

Test case

When input and media elements are adopted with document.adoptNode() from a foreign document (via DOMParser, for example) they lose their native shadow DOM roots and are left in a mostly broken state: <input>s lose their native UI, and <video> and <audio> elements lose their native controls.

To reproduce, open the attached adopt-node-bug.html file in Safari and compare the correct middle column (imported node) to the incorrect right column (adopted node).

Tested in Safari v14.0.3 (16610.4.3.1.4) on macOS v11.2.2, and mobile Safari on iOS v14.4.

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