How to detect IE11 on Windows 10 in javascript?

Question

• it shouldn't depend on an easily spoofable method (eg user agent)
• it shouldn't be picked up by earlier versions of Windows

AFAIK the only difference between IE11 on Windows 8.1 and Windows 10 is the removal of P3P.
Are there any other changes/unfixed bugs that could be used to detect it?
Something like the IE11 on Windows 7 guide—but for Windows 10—would be quite useful in that endeavour.

Answer 1

Here's how I did it:

if (
     // is IE 11 even in web workers
     !self.ActiveXObject && 'ActiveXObject' in self &&

     // exclude Windows 7/8/8.1 and Windows Phone 8.1
     /Windows NT 10.0/.test(self.navigator.userAgent)
   )
   console.log('IE11 on Windows 10');

I have also read that HTTP/2 support is Windows 10 specific .