JS
$(document).ready(function(){ $("button").click(function(){ $("h1, h2, p").addClass("green"); $("div").addClass("red"); }); });
CSS
.red { color: red; font-size: 25px; } .green { color: green; }
HTML
<h1>Heading 1</h1> <h2>Heading 2</h2> <p>A paragraph.</p> <p>A paragraph.</p> <div>Some text</div><br> <button>Click on me</button>
Heading 1
Heading 2
A paragraph.
A paragraph.
Some text
Click on me