title: Zooming or wheeling on a mobile browser
body: <p>In a desktop browser, I detect the mouse wheel use with the standard mousewheel or DOMMouseScroll events. I can thus change a canvas (zooming in a kind of map).</p>
  
  <p>Now I want to bring this feature to my mobile users : I need to intercept the standard pinch-zoom gestures (without zooming the page). Is that possible today ? Is it possible to get the center of the gesture (for localized zoom and unzoom) ?</p>
  
  <p>Note that it needs to work on the standard browser of Android 4.2. Other browsers/devices aren't in the scope of this question, which may make it easier.</p>