[Webkit-unassigned] [Bug 158550] New: Cannot attach Shadow root to unregistered custom element name

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158550

            Bug ID: 158550
           Summary: Cannot attach Shadow root to unregistered custom
                    element name
    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: ericbidelman at chromium.org
                CC: cdumez at apple.com

Repo:
1. Visit http://jsbin.com/kowodikoyo/edit?html,output in Safari TP version 9.1.2 (11601.7.4, 11602.1.35), or Webkit Nightly Version 9.1.1 (11601.6.17, r201834)
2. Click the pink button. 

Expected:
A ripple animation where you click.

Actual:

Running the same demo (http://jsbin.com/kowodikoyo/edit?html,output) in Chrome Canary 52.0.2762.0 works as expected. The ripple animation plays.

It appears that attachShadowRoot is not working with a viable custom element name. Changing better-button -> div makes the demo work in Safari TP and WK Nightly.

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