title: HTML 5 canvas: detect long click
body: <p>I'm working on some HTML5 canvas drawing. The drawing application is an IPad WebApp. </p>
  
  <p>Now I would like to know whether there is any possibility to track a long tap (tap and hold) on the canvas and to link it to an event outside the canvas. For example: I tap hold for three seconds on the canvas, which causes a Popup to be visible.</p>