[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

--- Comment #1 from Jason Miller <jason at developit.ca> ---
I spent a bit of time checking various forms of this issue:
https://jsfiddle.net/developit/u6xztc93/

I was able to narrow the issue down:

- microtasks are only flushed in the realm of the frame's ownerDocument.
- flush is *not* triggered for sandboxed iframes.
- flush *is* triggered for cross-origin iframes.
    (presumably because it's not known to be cross-origin at append time)
- flush *is* triggered for iframes within <svg><foreignObject>.
- other elements (svg/img/video/object/embed) do not trigger flush.

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