code: function (percent) {
              var rounded = Math.round(percent / this.coords.p_step) * this.coords.p_step;
  
              if (rounded > 100) {
                  rounded = 100;
              }
              if (percent === 100) {
                  rounded = 100;
              }
  
              return this.toFixed(rounded);
          }
docs: Round percent value with step
  
  @param percent {Number}
  @returns percent {Number} rounded