Following on from the last issue about returning a Promise, for consistency it would make sense to do the same for the doNotTrack property. Its value cannot be calculated simply before the document is loaded as it may change as a result of user action or calls to the API. Code that uses the API is likely to need to be notified when doNotTrack changes, and having to do it inside a setInterval call back is annoying.
rather than making it simply a DOMString we could derive it from EventTarget, so code could do things like:
navigator.doNotTrack.addEventListener( "consent", function(dnt){
// doNotTrack has changed, - read and act on it now!
// dnt=="1" means DNT header will be "1" in any requests to this origin
WebIDL
partial interface Navigator {
readonly attribute DoNotTrack doNotTrack;
};
interface DoNotTrack: EventTarget {
DOMString? val;
}
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