nl_tokens: filters mouse events so an event is fired only if the mouse moved .
pl_tokens: function installFilteredMouseMove ( element ) { <mask> . on ( "mousemove" , function ( e ) { var lastpos = lastMousePosition ; if ( lastpos === undefined || lastpos . x !== e . pageX || lastpos . y !== e . pageY ) { $ ( e . target ) . trigger ( "mousemove-filtered" , e ) ; } } ) ; }