Re: [webcomponents] Sharing styles across custom elements (#282)

FYI.
In Blink, we calculates the hash value of textContent of `<style>` element before parsing it. If the hash value is same to one of the cached values, we omit the parsing stage and reuse and share the result.

I think the draft proposal is a way to resolve this issue officially. Users can feel that this kind of efficiency is guaranteed.

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https://github.com/w3c/webcomponents/issues/282#issuecomment-122186756