[Webkit-unassigned] [Bug 6270] New: Some content is rendered twice

[bugzilla-daemon at opendarwin.org]

http://bugzilla.opendarwin.org/show_bug.cgi?id=6270

           Summary: Some content is rendered twice
           Product: WebKit
           Version: 412+
          Platform: Macintosh
               URL: http://daringfireball.net/misc/2005/12/sidebar-
                    fubar.html
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: gruber at daringfireball.net


This is a rendering bug I encountered on the front page of Daring Fireball today. Sometimes -- not 
every time but most times, reload a few times if you don't see the problem at first -- the sidebar 
content (nav menu and sponsored by ad) is incorrectly rendered a second time, about 50px or so below 
the first (correct) rendered instance. It's like a double picture.

Note that the repeated content is not repeated in the HTML markup. This is clearing a rendering bug.

The bug is triggered by some combination of the photo of my son in the main column, and the 
"SidebarPromo" <div> in the sidebar. If I take out the photo, the glitch disappears. If I take out the 
SidebarPromo <div>, the glitch disappears.

Further, if I move the SidebarPromo <div> closer to the rest of the sidebar (my byline credit), the glitch 
doesn't appear. If you look at the linked CSS file for the bug demonstration (sidebar-fubar.css) and 
change the margin-top: on line 488 from 7em to 3em (or less), the bug disappears.

Lastly, when trying to reproduce this bug with recent nightly builds (using WebKit.app), Safari crashes 
when it loads this page.

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