docs: function getClosestHandle ( proposal ) {
  
              var closest = 100;
              var handleNumber = false;
  
              scope_Handles.forEach(function(handle, index){
  
                  // Disabled handles are ignored
                  if ( handle.hasAttribute('disabled') ) {
                      return;
                  }
  
                  var pos = Math.abs(scope_Locations[index] - proposal);
  
                  if ( pos < closest ) {
                      handleNumber = index;
                      closest = pos;
                  }
              });
  
              return handleNumber;
          }