code: function (element, startPos, options) {
              this.startFrom = startPos;
              this.wrapper.remove();
              if (this.elementHint) {
                  this.elementHint.remove();
                  this.elementHint = null;
              }
              
              if (fontSize == '') {
                  fontSize = window.getComputedStyle(element).getPropertyValue('font-size');
              }
              if (fontFamily == '') {
                  fontFamily = window.getComputedStyle(element).getPropertyValue('font-family');
              }
              
              var w = element.getBoundingClientRect().right - element.getBoundingClientRect().left;
              dropDown.style.marginLeft = '0';
              dropDown.style.marginTop = element.getBoundingClientRect().height + 'px';
              this.options = options;
  
              if (this.element != element) {
                  this.element = element;
                  this.elementStyle = {
                      zIndex: this.element.style.zIndex,
                      position: this.element.style.position,
                      backgroundColor: this.element.style.backgroundColor,
                      borderColor: this.element.style.borderColor
                  }
              }
  
              this.element.style.zIndex = 3;
              this.element.style.position = 'relative';
              this.element.style.backgroundColor = 'transparent';
              this.element.style.borderColor = 'transparent';
  
              this.elementHint = element.cloneNode();
              this.elementHint.className = 'autocomplete hint';
              this.elementHint.style.zIndex = 2;
              this.elementHint.style.position = 'absolute';
              this.elementHint.onfocus = function () { this.element.focus(); }.bind(this);
  
  
  
              if (this.element.addEventListener) {
                  this.element.removeEventListener("keydown", keyDownHandler);
                  this.element.addEventListener("keydown", keyDownHandler, false);
                  this.element.removeEventListener("blur", onBlurHandler);
                  this.element.addEventListener("blur", onBlurHandler, false);                
              } 
  
              wrapper.appendChild(this.elementHint);
              wrapper.appendChild(dropDown);
              element.parentElement.appendChild(wrapper);
  
  
              this.repaint(element);
          }
docs: Only to allow  easy access to the HTML elements to the final user (possibly for minor customizations)