[Webkit-unassigned] [Bug 33150] Do not render the full frame when there is some elements with fixed positioning

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=33150





--- Comment #21 from Adam Treat <treat at kde.org>  2010-01-19 12:39:48 PST ---
(In reply to comment #17)
> (In reply to comment #5)
> > (4) Why not make fixed background images work too?  They are just as common (if
> > not moreso) than fixed positioning.
> 
> Fixed background seems to be often used on the root element (covering the
> entire view), making this optimization ineffective. Optimizing the case would
> require moving copy-scroll implementation to WebKit too.

Indeed.  I was not aware of this patch, but we've 'optimized' this case by
disabling fixed background images given a define: FAST_MOBILE_SCROLLING

See here:

https://bugs.webkit.org/show_bug.cgi?id=33408

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