[Webkit-unassigned] [Bug 99939] should disallow gc/layout/stylerecalc in beforeunload/unload handlers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=99939





--- Comment #5 from James Robinson <jamesr at chromium.org>  2012-10-22 18:46:56 PST ---
(In reply to comment #4)
> (In reply to comment #2)
> > What would you return to layout-dependent JS queries in beforeunload/unload handlers?
> 
> Stale numbers?

This sounds like a complete non-starter to me.  The page might not actually unload when these events are fired and there's tons of layout-dependent JS out there for seemingly trivial things.  Silently returning incorrect values is likely to break pages in ways that will be nearly impossible to debug.

I agree that measuring the breakdown of costs as the logical next step.

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