perf: parallelize iframe population in accessibility snapshots (upstream #15083)#3499
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…eam #15083) Replace sequential foreach loop with Task.WhenAll in PopulateIframesAsync, mirroring upstream's Promise.all optimization. Pages with multiple iframes now populate their accessibility trees concurrently instead of one-by-one. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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When
page.accessibility.snapshot({ includeIframes: true })runs on a page with multiple iframes, we were populating each iframe's accessibility tree one at a time. Replaced the sequentialforeachloop inPopulateIframesAsyncwithTask.WhenAll, so all iframes are populated concurrently — matching upstream'sPromise.allchange.Upstream: puppeteer/puppeteer#15083