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<!DOCTYPE html> <html> <head> <script src="jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("h1,h2,p").addClass("blue"); $("div").addClass("important"); }); }); </script> <style type="text/css"> .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>
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