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The specific issue was that elements existing in the page before the tag was registered was causing issues. This is encountered with the <polymer-element> tag. BUG= R=jmesserly@google.com Review URL: https://codereview.chromium.org//26558008 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@28434 260f80e4-7a28-3924-810f-c04153c831b5