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this follows a bug report http://bugzilla.mozilla.org/show_bug.cgi?id=256684 where Mozilla 1.7 fixed this issue. The ID starts with a number. Since an ID MUST NOT start with a number it is an invalid ID. If one selector isn't correct the whole selector rule should be ignored. http://www.w3.org/TR/html401/types.html#type-name http://www.w3.org/TR/2004/CR-CSS21-20040225/syndata.html#q10 Current CSS validator doesn't choke on test: http://wolruf.free.fr/mozbug/css/test.html
See on http://qa-dev.w3.org:8001/