cloneNode + shadow DOM's is a HUGE win. We de-dupe rules inside shadows & use separate (faster!) resolver.
Might get fewer property invalidations, but you trade that for more passes through the bindings; not a trade I'd naively make (need to test)
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Here's the numbers (let me know if I can improve this test): https://esbench.com/bench/5908f78199634800a0347e94 …pic.twitter.com/vq4sjYvgFw
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This is measuring throughput of the bindings, looks like. Maybe parsing perf. But not style resolution.
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& Web Standards TL; Blink API OWNER
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