Somehow we end up with an image result that can be missing some updates compared to what we'd get with DRT.
An obvious example of this is fast/css/font-face-woff.html where the text rendered by the webfont might not be part of the WK2 pixel results.
=== Bulk closing of Qt bugs ===
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If you believe that this is still an important QtWebKit bug, please fill a new report at https://bugreports.qt-project.org and add a link to this issue. See http://qt-project.org/wiki/ReportingBugsInQt for additional guidelines.