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<!DOCTYPE html>
<html>
<body>
​
<p>Click the button to create, and add, a comment to the HTML document.</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var c = document.createComment("My personal comments");
  document.body.appendChild(c);
  var x = document.getElementById("demo");
  x.innerHTML = "A comment was added to this document, but as you know, comments are invisible.";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_document_createcomment by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:40 GMT -->
</html>
​
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