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<!DOCTYPE html>
<html>
<body>
<h1>The item() Method</h1>
<p>Click the button to return the first CSS property name from the style declaration of the "ex1" element:</p>
<div id="ex1" style="color:blue; font-family:monospace;">Some text</div>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  var style = document.getElementById('ex1').style;
  var propname = style.item(0);
  alert(propname);
}
</script>
</body>
</html>