nl_tokens: https : // dom . spec . whatwg . org / #set - the - canceled - flag
pl_tokens: function setCancelFlag ( data ) { if ( <mask> . passiveListener != null ) { if ( typeof console !== "undefined" && typeof console . error === "function" ) { console . error ( "Unable to preventDefault inside passive event listener invocation." , data . passiveListener ) ; } return } if ( ! data . event . cancelable ) { return } data . canceled = true ; if ( typeof data . event . preventDefault === "function" ) { data . event . preventDefault ( ) ; } }