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Web IDL seems to define Date not as a number of seconds (http://www.w3.org/TR/WebIDL/#idl-Date). Also it tells that expiry can be "-1" but Date doesn't allow it to be "-1". I think it's better to define expiry as nullable instead. I think the following is better: "The time when cookie should be deleted. This SHOULD be set or MUST be null if unknown." Also there seems to be a typo in a row above: "The domain the cookie is visible too" -> "The domain the cookie is visible to"
Corrected in https://dvcs.w3.org/hg/webdriver/rev/be3d11f4e7c8