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<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("#div1").addClass("important blue"); }); }); </script> <style> .important { font-weight: bold; font-size: xx-large; } .blue { color: blue; } </style> </head> <body> <div id="div1">This is some text.</div> <div id="div2">This is some text.</div> <br> <button>Add classes to first div element</button> </body> </html>
