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<!DOCTYPE html>
<html>
<body>
​
<p>Click the button to create an OPTGROUP element.</p>
​
<button onclick="myFunction()">Try it</button>
​
<select id="mySelect" size="6">
  <option>BMW
  <option>Mercedes
  <option>Ford
  <option>Volvo
  <option>Toyota
</select>
​
<script>
function myFunction() {
  var x = document.getElementById("mySelect");
  var y = document.createElement("OPTGROUP");
  y.setAttribute("label", "SwedishCars");
  y.appendChild(x.options[3])
  x.insertBefore(y, x.options[3]);
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_optgroup_create by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:07:54 GMT -->
</html>
​
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