Gecko changed its behavior in [bug 741295](https://bugzilla.mozilla.org/show_bug.cgi?id=741295) to support class and id on all elements, as specified by the DOM spec (at the time, at least). -- GitHub Notification of comment by dbaron Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/534#issuecomment-249673212 using your GitHub accountReceived on Monday, 26 September 2016 19:33:29 UTC
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