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<!DOCTYPE html>
<html>
<body>
​
<div id="myDiv">This is a div element.</div>
<br>
​
<select onchange="myFunction(this);" size="10">
  <option>none</option>
  <option>hidden</option>
  <option>dotted</option>
  <option>dashed</option>
  <option>solid</option>
  <option>double</option>
  <option>groove</option>
  <option>ridge</option>
  <option>inset</option>
  <option>outset</option>
</select>
​
<script>
function myFunction(selectTag) {
  var listValue = selectTag.options[selectTag.selectedIndex].text;
  document.getElementById("myDiv").style.borderLeftStyle = listValue;
}
</script>
​
</body>
</html>
​