title: mousemove event is triggered onscroll even when mouse was not moved on Chrome
body: <p>I was trying to answer an issue with custom drop down, but challenged by an inconsistent behavior in Chrome and Firefox.</p>
  <p><strong>DEMO:</strong> <a href="http://jsfiddle.net/fyeht/" rel="nofollow noreferrer">http://jsfiddle.net/fyeht/</a> [Added scroll event for more clarity]</p>
  <p>See below image, The list items can be navigated using arrow keys.</p>
  <p><strong>To Reproduce the issue:</strong></p>
  <ol>
  <li>Open console in Chrome (<kbd>F12</kbd>)</li>
  <li>Click on an item in the list (you would notice some events getting logged in the console)</li>
  <li>Use down arrow key to navigate to the next item in the list</li>
  <li>Finally, the issue is noticed when you reach the last item in the view and hitting down arrow would scroll. Check the log to see 'scroll', 'mouse enter' and 'mouse move' [check the new demo]</li>
  </ol>
  <p>The issue is after reaching the end of items in view, it scrolls. Even though the mouse is untouched, it triggers <code>mouseenter</code> and <code>mousemove</code> events in Chrome. In FF, on scroll it triggers just the <code>mouseenter</code> which make sense.</p>
  <p><img src="https://i.stack.imgur.com/Y9J5q.png" alt="enter image description here" /></p>
  <p><strong>Question(s):</strong></p>
  <ul>
  <li>Why is <code>mousemove</code> triggered when mouse is untouched?</li>
  <li>Is this just browser inconsistency? Could not find documentation on events triggered when scrolling? (never knew it did)</li>
  </ul>
  <p>Submitted a bug report: <a href="https://code.google.com/p/chromium/issues/detail?id=241476" rel="nofollow noreferrer">https://code.google.com/p/chromium/issues/detail?id=241476</a></p>