nl_tokens: Add event listener to the target element .
pl_tokens: function addListener ( element , type , listener ) { var options = arguments . length > 3 && arguments [ 3 ] !== undefined ? arguments [ 3 ] : { } ; var _handler = listener ; type . trim ( ) . split ( REGEXP_SPACES ) . forEach ( function ( event ) { if ( options . once && ! onceSupported ) { var _element$listeners = element . listeners , listeners = _element$listeners === void 0 ? { } : _element$listeners ; _handler = function handler ( ) { delete listeners [ event ] [ listener ] ; element . removeEventListener ( event , _handler , <mask> ) ; for ( var _len2 = arguments . length , args = new Array ( _len2 ) , _key2 = 0 ; _key2 < _len2 ; _key2 ++ ) { args [ _key2 ] = arguments [ _key2 ] ; } listener . apply ( element , args ) ; } ; if ( ! listeners [ event ] ) { listeners [ event ] = { } ; } if ( listeners [ event ] [ listener ] ) { element . removeEventListener ( event , listeners [ event ] [ listener ] , options ) ; } listeners [ event ] [ listener ] = _handler ; element . listeners = listeners ; } element . addEventListener ( event , _handler , options ) ; } ) ; }