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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(){ $("p, h1").removeClass("head intro main"); }); }); </script> <style> .head { font-size: 2em; color: green; } .intro { font-size: 120%; color: red; } .main { font-size: 20px; color: blue; } </style> </head> <body> <h1 class="head">This is a heading</h1> <p class="intro">This is a paragraph.</p> <p class="main">This is another paragraph.</p> <button>Remove the "head", "intro" and "main" class from the selected elements</button> </body> </html>