nl_tokens: ref https : // github . com / WICG / EventListenerOptions / pull / 30
pl_tokens: function isPassive ( ) { var supportsPassiveOption = false ; try { addEventListener ( "test" , null , Object . defineProperty ( { } , 'passive' , { get : function ( ) { supportsPassiveOption = <mask> ; } } ) ) ; } catch ( e ) { } return supportsPassiveOption ; }