code: function handleOptionClick(event) {
      let el;
  
      // find the element with the data
      // start with the target element
      if (event.target.dataset.optionValue) {
          el = event.target;
      // check up the tree one level (in case option text or status was clicked)
      } else if (event.target.parentNode.dataset.optionValue) {
          el = event.target.parentNode;
      }
  
      this.processAfterStateChange(el);
      this.expander.collapse();
      this.el.querySelector(comboboxHostSelector).focus();
  }
docs: Handle mouse click for option
  @param {MouseEvent} event