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Since ECMAScript 5 (i.e. Firefox 4 and newer), NaN, Infinity and undefined are non-writable global objects. So, effectively they act like keywords or literals (even though they are not). Please, would you consider highlighting them blue like a keyword, or green like a field, or in some other way distinguishing them from standard variables/symbols. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/1.8.5: The NaN, Infinity, and undefined global objects have been made read only, per the ECMAScript 5 specification.