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Both http://dev.w3.org/html5/markup/meter.html and http://dev.w3.org/html5/markup/progress.html suggest that typical mark-up includes a -webkit prefixed CSS value. This shouldn't be necessary.
Sorry for having taken so long to get around to fixing this, but I just now checked in a change: http://dev.w3.org/cvsweb/html5/markup/tools/css2xml.diff?r1=1.10;r2=1.11;f=h That completely suppresses the "Typical default display properties" section for meter and progress altogether -- because (as I understand it at least) they are replaced elements, so their default CSS properties don't really tell you much at all about how they are actually displayed. There were some instances of other -webkit-* properties in the draft, so I tweaked my script to remove or replace all those. (And note that the reason the content of the "Typical default display properties" sections has -webkit-* stuff in it to begin with is that it's generated by processing the default WebKit user-agent stylesheet.) If you're satisfied with the changes, please move the status of this bug to Closed; if you're not satisfied, please re-open it with a comment.