title: Chrome mousedown and mouseup events no longer working, other browsers are fine
body: <p>As of today (or yesterday, didn't notice it then), mousedown and mouseup events are no longer working. I am on Chrome Version 55.0.2883.95 (64-bit). Safari and FireFox are working fine (I am on a mac computer).</p>
  
  <p>Here is the code:</p>
  
  <pre><code>document.getElementById("floorplan-backdrop-rect").addEventListener('mousedown', function(ev) {
      o.clickDown(ev);
  }, false);
  
  document.getElementById("floorplan-backdrop-rect").addEventListener('mouseup', function(ev) {
      o.clickUp(ev);
  }, false);
  </code></pre>
  
  <p>Were there any API changes regarding mouse-events that we missed? Chrome does not throw any warning when registering the events either. Touchdown and touch up event seem to fail too (in emulated iPad mode in developer tools)</p>
  
  <p><strong><em>EDIT: Right after changing tab, or when resizing the window, the events seem to come through for a short while. Then they stop again..</em></strong></p>
  
  <p>Regards</p>