This bug was logged against Chromium originally http://code.google.com/p/chromium/issues/detail?id=61603
Please load the attached testcase in a nightly build of Safari or Chromium and you will see the problem.
This appears to have regressed in webkit revision 70748
2010-10-27 Andy Estes <firstname.lastname@example.org>
Reviewed by Adam Barth.
r66156 broke AtlasCT library, formerly affected http://map.d.co.il/
This patch removes WebKit's map of classid values to MIME types. It also
changes the behavior of object elements to render fallback content when
a non-empty classid attribute is specified, which is the behavior HTML5
specifies when a UA encounters a classid it doesn't understand.
* html/HTMLObjectElement.cpp: Remove serviceTypeForClassId(),
createClassIdToTypeMap(), and the ClassIdToTypeMap typedef.
(WebCore::HTMLObjectElement::updateWidget): Do not call
serviceTypeForClassId() when there is no type attribute, and render
fallback content if the classid attribute is non-empty.
Created attachment 72765 [details]
*** This bug has been marked as a duplicate of bug 48757 ***