http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=1655 <!DOCTYPE html> ...<style> iframe { border: solid; float: left; } </style> <iframe seamless srcdoc="<style>*{margin:0;padding:0;}</style><div style='background:blue'>ABC</div>"></iframe>
I suspect this is very related to bug 87707.
Duping this against 87707. The fix I have in the pipe for that bug fixes this one as well. *** This bug has been marked as a duplicate of bug 87707 ***