title: Pointerup event isn't working correctly with Windows Phone 8.1 / IE11
body: <p>The <code>pointerup</code> event is not working correctly with Win Windows Phone 8.1 and Internet Explorer 11. I mean, it is triggered automatically (just after pointerdown), and not when your finger goes out.</p>
  
  <p>I've done an <strong><a href="http://bl.ocks.org/Xatpy/raw/814d5df9e1911fd83e64/" rel="nofollow">example here</a></strong>. </p>
  
  <p>If you test it with desktop browsers or Android-Chrome or iOS-Chrome/Safai works correctly</p>
  
  <p>Has anyone any workaround about it?</p>