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Current document.register() definition [1] defines uniqueness based on "TYPE and NAME and NAMESPACE", it allows custom elements which have same TYPE(custom element name) but different NAME(local name)s. This is confusing. It'd better to ensure TYPE uniqueness. [1] https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/custom/index.html#extensions-to-document-interface
You're right!
https://dvcs.w3.org/hg/webcomponents/rev/8f50c0722e63