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<!DOCTYPE html> <html> <body> <p>Click the button to create a HEADER element containing a h3 element with some text.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.createElement("HEADER"); x.setAttribute("id", "myHeader"); document.body.appendChild(x); var y = document.createElement("H3"); var t = document.createTextNode("This is a h3 element in a header element"); y.appendChild(t); document.getElementById("myHeader").appendChild(y); } </script> </body> </html>