docs: function (src) {
              var newSavedX = this._initialSavedX + src.posX - this._initialDrag;
  
              if (src.id === this._firstDomId) {
                  // We can't move further the second thumb
                  var limit = this._savedX2 - this._firstWidth;
                  if (newSavedX >= limit) {
                      this._savedX1 = limit;
                  } else {
                      this._savedX1 = newSavedX;
                  }
              } else {
                  var limit = this._savedX1 + this._firstWidth;
                  if (newSavedX <= limit) {
                      this._savedX2 = limit;
                  } else {
                      this._savedX2 = newSavedX;
                  }
              }
              this._updateHighlight();
              this._setValue();
          }