Please file a bug at https://bugs.webkit.org with the component WebKit Misc. 
and attach your test case as an HTML file. Please also CC me on it 
(bweinst...@apple.com).

Thanks!
Brian Weinstein 

On Oct 17, 2012, at 12:58 AM, HIDEKI YOSHIDA <yoshida-...@necst.nec.co.jp> 
wrote:

> Hi,
> 
> On a windows 7 tablet, PAN operation(=scroll) causes
> corruption of screen.
> 
> Does anybody know how to resolve this or have the fix?
> 
> How to reproduce.
> 1. Prepare a HTML contents which have an element specifying
>   other than "visible" to the property overflow in css.
> 2. Load the contents with webkit
> 3. Operate the touch operaion, PAN on the element.
> 
> Problem
> The content in the element protrudes outside the placeholder 
> for it and can disappear.
> 
> The build version
> Webkit.exe on r131112 for Nightly builds
> 
> We guess Source\WebKit\win\WebView.cpp has some bugs on this 
> issue.
> 
> Here is the sample contents to reproduce problem. You will see the
> problem if you PAN on the field for "overflow:auto".
> 
> ----------
> <HTML>
> <HEAD><TITLE>pan with css:overflow</TITLE></HEAD>
> <BODY>
> <font size="+2">
> <div style="border: 2px solid blue; padding: 5px 5px 5px 5px; 
> overflow:visible;">
> overflow:visible
> </div>
> <br>
> <div style="border: 2px solid red; padding: 5px 5px 5px 5px; overflow:auto;">
> overflow:auto
> </div>
> </font>
> </BODY>
> </HTML>
> ----------
> 
>                                                        Hideki
> 
> ***************************************************************************
>  Hideki Yoshida
>  Embedded Software Division
>  NEC System Technologies, Ltd.
>    E-MAIL:yoshida-...@necst.nec.co.jp
> ***************************************************************************
> 
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> webkit-dev mailing list
> webkit-dev@lists.webkit.org
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