Re: [w3c/webcomponents] Why must the is="" attribute exist? (#509)

This was previously discussed at length in the other bug tracker, and it's explained in the spec in the sentence above that:

> Customized built-in elements require a distinct syntax from autonomous custom elements because user agents and other software key off an element's local name in order to identify the element's semantics and behaviour. That is, the concept of customized built-in elements building on top of existing behaviour depends crucially on the extended elements retaining their original local name.

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Received on Tuesday, 31 May 2016 19:14:57 UTC