Run ❯
<!DOCTYPE html> <html> <script src= "../../ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("h1, h2, p").toggleClass("blue"); }); }); </script> <style> .blue {color: blue;} </style> <body> <h1>Heading 1</h1> <p>This is a paragraph.</p> <button>Toggle class</button> </body> </html>