xxxxxxxxxx<html lang="en"><head><meta charset="utf-8"><title>jQuery Set HTML Contents of the Element</title><script src="https://code.jquery.com/jquery-3.5.1.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("body").html("<p>Hello World!</p>"); });});</script></head><body> <button type="button">Write Message</button></body></html>