Re: [w3c/webcomponents] A way to implement :hover, :active, etc, for custom elements. (#738)

> I tend to agree with @rniwa on using shadow roots as the extension hook for all things

The A-Frame elements don't have shadow roots. I don't have a perf test, but seems like adding shadow roots to them all is a fair amount of weight considering how long shadow root prototype chains are, almost like duplicating the number of nodes, right? Plus shadow root cause dividing algorithm, which also adds runtime cost, which is unnecessary for Elements that don't even need it. In a case like A-Frame Elements, the goal is to save all resources for the WebGL rendering performance.

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