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The CSS validation service result says "optgroup is not an HTML Element". Problem occurs often but not always. This is very true even if you try validate sequential times very same CSS with some optgroup CSS-rule(s).
note: Looks like the validator does not send *any* warning about bogus elements any more.
Created attachment 472 [details] test case
Created attachment 473 [details] test case (amended, with CSS rule)
Created attachment 474 [details] test case (amended, fixed typo)
As mentioned in (In reply to comment #1) > note: Looks like the validator does not send *any* warning about bogus elements > any more. Tested with Attachment #474 [details]. closing bug.