Re: [whatwg/dom] Should there be a declarative version of adoptedStyleSheets? (#910)

> To take a step back, is the problem reusing a style sheet across distinct shadow trees or is the problem reusing a shadow tree? The latter is the concern I heard @fantasai raise during the meeting.

Both of these concerns were raised at the meeting, but this issue is about the former: re-using styles.

The latter, re-using shadow trees, is (much!) better solved by Template Instantiation, in my opinion. Declarative Shadow DOM is just like the rest of HTML - if you want two identical chunks of DOM, copy/paste the HTML for them. Or use templates (or template instantiation) to stamp out copies of HTML.

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