Re: [w3c/webcomponents] Should <link rel="stylesheet"> work inside shadow DOM? (#530)

It seems like the argument against is that UAs are able to optimize `<style>` with the same text content appearing many times in the same document, but are not able to optimize `<link rel="stylesheet">` with the same `href`.

Is that completely true? Even if the response has appropriate long-lived caching headers? I guess on initial page load with an umprimed response it would probably still make a bunch of requests, which is bad?

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