We can create a <li> element via the document.createElement()
method:
var x = document.createElement("LI");
<!DOCTYPE html> <html> <body> <ol id="myList"> <li>Java</li> <li>CSS</li> <li>HTML</li> </ol>/*from ww w. ja v a 2 s. c o m*/ <p>Click the button to create a LI element.</p> <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() { var x = document.createElement("LI"); var t = document.createTextNode("Coffee"); x.appendChild(t); document.getElementById("myList").appendChild(x); } </script> </body> </html>