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div {border:2px dot} should indicate a problem as the correct spec would be div {border:2px dotted} poorly defined specs should be trapped even though a browser may be able to tolerate error by assumptions
Initial testing shows that any value comprising an <identifier> after a <length> will escape error detection. We need test cases. The result that the validator yields and calls valid is itself invalid: a { border: 1px none inherit }
Fixed in today's patch, online version will be up soon at http://qa-dev.w3.org:8001/css-validator/