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Select elements should be able to accept the required attribute: they are interactive, submittable and resettable. That means they have a value which can be changed by the user. If there is no selected option, the select element value is the empty string so it should be easy to check if the element is suffering from being missing.
Also see http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2006-October/007331.html
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Rejected Change Description: no spec change Rationale: This is a feature request. To avoid getting too far ahead of implementations, we need to wait until browsers have implemented what we have today before adding more. See also: http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2010-August/027778.html
This ended up being added.