[Bug 28544] New: Custom elements should not upgrade elements by setting prototype

[bugzilla]

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28544

            Bug ID: 28544
           Summary: Custom elements should not upgrade elements by setting
                    prototype
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Component Model
          Assignee: dglaz...@chromium.org
          Reporter: rn...@webkit.org
        QA Contact: public-webapps-bugzi...@w3.org
                CC: m...@w3.org, public-webapps@w3.org

Discussed here:
https://lists.w3.org/Archives/Public/public-webapps/2014JanMar/0158.html
https://lists.w3.org/Archives/Public/public-webapps/2015JanMar/0083.html

We shouldn't support upgrading of existing elements since it leaves the
corresponding DOM objects with a wrong identity.

This is also not a normal programming model. Even with ES6 modules, we don't
create a dummy modules while modules are loading and later automatically
replace them under the foot.

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