Re: [w3c/webcomponents] Generic programs can't reliably use/manipulate documents via the DOM (#640)

> I think the "standard" part here is important: how is any code not written by the document author supposed to deal with the myriad possible non-standard elements otherwise? The specs dictate that the standard elements should behave in the manner anyway, with or without a closed shadow DOM feature.

The same we'd deal with video elements, input elements, etc... which can be modeled as builtin elements with UA shadow roots (WebKit and Blink DO use shadow roots to implement these elements).

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