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

I ran into a performance issue today where I have 100 cards in a grid, and each card mounts a webcomponent with shadow containing a `<link>` tag. I discovered that while the browser is smart enough to coalesce the network calls, it seems to have to construct 100 distinct CSSStyleSheets which created a 300ms parseStylesheet/computeLayout/GC when the resource came back from the network. IMO the browser should be able to create 1 CSSStyleSheet and attach it to all 100 of the shadowTrees instead.

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