[Webkit-unassigned] [Bug 235322] Adding iframe flushes microtasks synchronously with dirty stack
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue Jun 28 22:50:38 PDT 2022
https://bugs.webkit.org/show_bug.cgi?id=235322
Ryosuke Niwa <rniwa at webkit.org> changed:
What |Removed |Added
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CC| |rniwa at webkit.org
--- Comment #3 from Ryosuke Niwa <rniwa at webkit.org> ---
I don't think this is a regression. The issue really stems from the fact we're still firing DOMContentLoaded and load events synchronously in Document::finishedParsing().
Since this code gets to run when inserting an iframe as a part of creating the initial empty document, we end up performing the microtask checkpoint.
Making DOMContentLoaded and load events fully asynchronous is a major undertaking but we can workaround this specific issue by detecting that's what's about to happen and avoid performing microtask checkpoint.
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