Re: [w3c/webcomponents] Shadow tree encapsulation and Element Timing (#816)

I meant

> Expose PerformanceElementTiming entries, but setting the element attribute value to the shadow host / shadow root.

I agree we could have something that allows more complicated delegation, but for the cases where shadow DOM is being used to encapsulate internal implementation details (like the range input in Dimitri's blog post), the timing of the element as a whole (as represented by the shadow host) is more interesting than the timing of any individual piece.

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