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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("h1, h2, p").addClass("blue"); $("div").addClass("important"); }); }); </script> <style> .important { font-weight: bold; font-size: xx-large; } .blue { color: blue; } </style> </head> <body> <h1>Heading 1</h1> <h2>Heading 2</h2> <p>This is a paragraph.</p> <p>This is another paragraph.</p> <div>This is some important text!</div><br> <button>Add classes to elements</button> </body> </html>