title: Touch API (e.g. touchstart) not working in MS Edge
body: <p>my application is using the Touch API to detect touch events in JavaScript. Example:</p>
  
  <pre><code>$(".element").on("touchstart", function(event){
      alert("TRUE");
  });
  </code></pre>
  
  <p>This works on any touch device with any browser like Android or iOS, however it doesn't work in MS Edge on a Windows 10 Tablet with or without conntected keyboard. The API seems to be supported: <a href="http://caniuse.com/#search=touch" rel="noreferrer">Compatibility list</a>. However, I've tested: <code>'ontouchstart' in window</code> and this returns false on this device. Furthermore <code>mousedown</code> seems to get fired.</p>
  
  <p>What is going on here? What can I do to fire touch events on a Windows 10 tablet?
  I would like to keep the event only for touch devices. Switching to the Pointer Events API would include also Desktop devices and that is not what I want.</p>