nl_tokens: Add classes to the given element .
pl_tokens: function addClass ( element , value ) { if ( ! value ) { return ; } if ( isNumber ( element . length ) ) { forEach ( element , function ( elem ) { addClass ( elem , value ) ; } ) ; return ; } if ( element . classList ) { element . classList . add ( value ) ; return ; } var className = element . className . trim ( ) ; if ( ! className ) { element . className = value ; } else if ( className . indexOf ( value ) < 0 ) { element . className = "" . concat ( className , " " ) . concat ( <mask> ) ; } }