[Bug 19763] New: [Custom]: Consider copying event listeners when upgrading elements

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19763

          Priority: P2
            Bug ID: 19763
          Assignee: dglazkov@chromium.org
            Blocks: 18720
           Summary: [Custom]: Consider copying event listeners when
                    upgrading elements
        QA Contact: public-webapps-bugzilla@w3.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: dglazkov@chromium.org
          Hardware: PC
            Status: NEW
           Version: unspecified
         Component: Component Model
           Product: WebAppsWG

Split off of bug 18732.

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