Support PerformanceObserver API
#1282
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nikneym
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mookums
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Dec 22, 2025
karlseguin
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Dec 23, 2025
Heavily based on MutationObserver and IntersectionObserver.
This still needs investigation. Spec doesn't refer usage of microtask queue for this, yet the current behavior doesn't match to Firefox and Chrome.
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This PR implements
PerformanceObserverformarkandmeasureperformance types. I'll add tests also but would like to receive reviews before that.