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<!DOCTYPE html>
<html>
<head>
<script>
function selectMultiple() {
  document.getElementById("mySelect").multiple = true;
}
</script>
</head>
<body>
​
<form>
<select id="mySelect" size="4">
  <option>Apple</option>
  <option>Pear</option>
  <option>Banana</option>
  <option>Orange</option>
</select>
<input type="button" onclick="selectMultiple()" value="Select multiple">
</form>
​
<p>Before you click "Select multiple", you cannot select more than one option (by holding down the Shift or Ctrl key).</p>
<p>After you have clicked "Select multiple", you can.</p>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=try_dom_select_multiple by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 13:24:00 GMT -->
</html>
​
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