code: function( origEvent ) {
              var next = steps.indexOf( activeStep ) + 1;
              next = next < steps.length ? steps[ next ] : steps[ 0 ];
  
              return goto( next, undefined, "next", origEvent );
          }
docs: `next` API function goes to next step (in document order) `event` is optional, may contain the event that caused the need to call next()