You can edit / change the code and click run button
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <script src="../../../ajax/libs/jquery/1-11-3/jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("<h2>New text</h2>").replaceAll("p"); }); }); </script> <script>var clicky_site_ids = clicky_site_ids || []; clicky_site_ids.push(101319977);</script><script async src="//static.getclicky.com/js"></script></head> <body> <button>Replace all p elements with h1 elements</button><br> <p>I am old text </p> <p>This is old text </p> <p>I am pretty old!!!.</p> </body> </html>