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e.g. https://dvcs.w3.org/hg/undomanager/raw-file/default/undomanager.html The document is served over https but uses a stylesheet served over http. This does not work in Chrome and will soon stop working in Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=834836).
This certainly is a problem, but has nothing to do in this bugzilla. I'll forward your concerns to the right forum.
Thanks. Can you also point me in the right direction? :)
Sorry, I meant to do that and forgot to paste the link! The mailing list you want is http://lists.w3.org/Archives/Public/public-webapps/. That's where all of those specs are developed.