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<!DOCTYPE html> <html> <body> <p>An unordered list:</p> <ul> <li>Coffee</li> <li>Tea</li> <li>Milk</li> </ul> <p>Click the button to find out how many li elements there are in this document.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByTagName("LI"); document.getElementById("demo").innerHTML = x.length; } </script> </body> </html>