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The "Non-conforming features" section of the spec lists "code on object elements" as an obsolete attribute. But as far as I can tell, the code attribute -- while widely used on the applet element -- was never valid on the object element in any version of HTML and does not seem to be used in any significant amount of existing Web content. See, for example, http://dev.opera.com/articles/view/mama-plug-ins/#object So, I'm wondering whether the "code on object elements" line should be removed from that section (so that, e.g., conformance-checker developers don't feel any need to do any special reporting for that case).
some further data: <Philip`> I see several <object codetype>s in dotbot data <Philip`> and zero <object code>s <Philip`> (By "several" I mean about a dozen sites)
OK, further data which instead suggests that there is a (small) case for including "code on object elements" as obsolete <Philip`> http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E%0A%3Cbody%3E%0A%3Cobject%20id%3Do%3E%3C%2Fobject%3E%3Cscript%3Edocument.getElementById%28%27o%27%29.code%3D1%3C%2Fscript%3E - hmm, browsers support it <Philip`> http://google.com/codesearch?q=%3Cobject%5B%5E%3E%5D%2A%5Cscode%3D - some people use it so, I will move this to resolved/invalid