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<!DOCTYPE html>
<html>
<body>
​
<p>The first p element in the document.</p>
<p>Another p element.</p>
​
<p>Click the button to find out how many p elements there are in this document.</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo">I am also a p element.</p>
​
<script>
function myFunction() {
  var nodelist = document.getElementsByTagName("P").length;
  document.getElementById("demo").innerHTML = nodelist;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_nodelist_length_doc by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:02 GMT -->
</html>
​
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