[Webkit-unassigned] [Bug 154399] Position fixed is buggy with overflow:auto scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154399

Frédéric Wang (:fredw) <fred.wang at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dvoytenko at google.com,
                   |                            |jfernandez at igalia.com

--- Comment #4 from Frédéric Wang (:fredw) <fred.wang at free.fr> ---
(In reply to Simon Fraser (smfr) from comment #3)
> I don't see severe jumping or flicking of the top and bottom bars in that
> testcase, on 10.3.2. I do see some subpixel jittering, which is because
> WebCore rounds scroll positions to integral values, and when the page has a
> non-unit scale there's some rounding going on.
> 
> On what device and iOS version do you see the more severe flickering?

OK, I was actually testing with the simulator version 10.3.2 (where I see the behavior you describe) and the testing on a real device was done by dvoytenko and jfernandez (where they see the bug). So maybe it's actually related to the iOS version?

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