[Webkit-unassigned] [Bug 50210] New: Positioning error in dynamically inserted content

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50210

           Summary: Positioning error in dynamically inserted content
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://math.stackexchange.com/questions/120/is-1-a-pri
                    me-number/5735#5735
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: shogun70 at westnet.com.au


MathJax is a JS library that renders math in the browser using TeX or MathML as the source. MathJax is used on various sites, including math.stackexchange.com, where this issue was first reported.  

This issue occurs rarely, but whenever it does (such as the example URL) it always seems to be the last dynamically inserted content in a paragraph being incorrectly rendered above the top of the paragraph. The HTML and style settings seem fine, so this seems to be a Webkit rendering issue. 

To see an example:
1. Browse to http://math.stackexchange.com/questions/120/is-1-a-prime-number/5735#5735
2. Wait for math rendering to complete. 
3. Look for the paragraph starting with "THEOREM 28". Above the paragraph is the math R/N. This should be at the end of the paragraph. 

The math can be forced into its correct position in several trivial ways that do not change the content or styles. For example, the following bookmarklet, which merely clears and restores the left position of a suitable element, forcing a reflow in between.

javascript:(function(el) { var x = el.style.left; el.style.left = ""; el.offsetLeft; el.style.left = x; el.offsetLeft; })(document.querySelector("#MathJax-Span-184").parentNode); void(0);

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