file:// urls are awesome! People forget about them and nobody actually understands what to expect from these urls. Consider cross-origin policy implications. Is

file:// urls are awesome! People forget about them and nobody actually understands what to expect from these urls. Consider cross-origin policy implications. Is file:///home/john/bar.html on the same origin as file:///home/john/foo.html ? Also, XHR is totally allowed to go to file://