docs: function handleMouseWheel(shell, ev) {
    handleEvent(shell, ev)
    var scale = 1
    switch(ev.deltaMode) {
      case 0: //Pixel
        scale = 1
      break
      case 1: //Line
        scale = 12
      break
      case 2: //Page
         scale = shell.height
      break
    }
    //Add scroll
    shell.scroll[0] +=  ev.deltaX * scale
    shell.scroll[1] +=  ev.deltaY * scale
    shell.scroll[2] += (ev.deltaZ * scale)||0.0
    return false
  }