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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<body>
​
<form>
  <select id="mySelect" size="8">
    <option>Apple</option>
    <option>Pear</option>
    <option>Banana</option>
    <option>Orange</option>
  </select>
</form>
<br>
​
<p>Select an option in the dropdown list. Then click the button below to add a "Kiwi" option before the selected option.</p>
​
<button type="button" onclick="myFunction()">Insert option before selected</button>
​
<script>
function myFunction() {
  var x = document.getElementById("mySelect");
  if (x.selectedIndex >= 0) {
    var option = document.createElement("option");
    option.text = "Kiwi";
    var sel = x.options[x.selectedIndex];  
    x.add(option, sel);
  }
}
</script>
​
</body>
​
</html>
​
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