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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to find out if the first attribute in this P element is an ID attribute</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  var x = document.getElementById("demo");
  x.innerHTML = x.attributes[0].isId;
}
</script>
<p><strong>Note:</strong> The isId property is not supported in any of the major browsers.</p>
</body>
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_attr_isid by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:38 GMT -->
</html>
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