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On the page http://docs.webplatform.org/wiki/css/properties/filter the title has a link next to it with the text "function filter() { [native code] } comment". Needless to say, this is incorrect.
Located the problem, asking around. :)
Seems to be working properly with the new comment UI in place. If the problem persists on other pages please file a report in the new system at http://project.webplatform.org