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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> </html>