title: Retrieving touchstart coordinates in a touchend event
body: <p>When a touchend event occurs, is it possible to know where the touch began (touchstart co-ordinates)? On first glance, this looks as easy as saving the coordinates during touchstart, but suppose the event is attached to all DOM elements with a particular class (ie. <code>.special</code>). Now consider that I touch two objects with the <code>.special</code> class then lift my finger off one. I can't just look at the last saved value, because it could be the first finger that I lifted up.</p>
  
  <p>How can I retrieve the touchstart coordinates in these circumstances?</p>