[Webkit-unassigned] [Bug 235322] Adding iframe flushes microtasks synchronously with dirty stack

[bugzilla-daemon at webkit.org]

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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