JSFiddle - React, Tailwind, and code Playground

HTML

<select id="sel" size="3" multiple="multiple">
  <option>First!</option>
</select>

JavaScript

var option = document.createElement('option');
option.myselected = false;
option.onclick = function() {
  if (this.myselected) {
    this.selected = false;
    this.myselected = false;
  }
  else {
  	this.myselected = true;
  };
};
option.innerHTML = "hey, hoh, gelato!";

var select = document.getElementById("sel");
select.appendChild(option);