Dimitri: Okay, I can follow up with Ryosuke. I’m happy to share our thoughts 
and needs for subclassing components.

Anne/Steve: I’d originally indicated that this technique couldn't be applied to 
extending native HTML elements. Since the two of your seemed interested in 
that, I spent some time tinkering with the idea, and it turns out that this 
technique can be made to work for that situation. I’ve posted a quick demo 
<http://janmiksovsky.github.io/base-template/extendButton.html>) showing 
subclassing of a standard HTML button element. This works best under native 
Shadow DOM. Under polyfilled Shadow DOM, base class styles can’t (yet?) be 

Anyway, I mention this in case it opens up some ideas. Thanks for the 

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