Re: [w3c/webcomponents] idea: Allow light DOM to delegate styles/behavior to shadow DOM (#883)

@calebdwilliams Basically what you're proposing is an alternative that (supposedly) avoids perf costs of what I am describing, right?

I asked at https://github.com/w3c/webcomponents/issues/745#issuecomment-668922849 and https://github.com/w3c/webcomponents/issues/889#issuecomment-668932473 about the actual performance metrics. It would be helpful if browser authors could point to some performance evidence. The use case that I showed the snippet of code for in https://github.com/w3c/webcomponents/issues/889#issuecomment-668932473 seems very valid, and I doubt it would cause any performance issue, for example.

Of course, I also don't have performance metrics, but then again I'm not authoring the web engine.

What I _can_ do is try to make a polyfill, and see how that performas.

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