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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(){ $("button").click(function(){ alert($("p").hasClass("intro")); }); }); </script> <style> .intro { font-size: 120%; color: red; } </style> </head> <body> <h1>This is a heading</h1> <p class="intro">This is a paragraph.</p> <p>This is another paragraph.</p> <button>Does any p element have an "intro" class?</button> </body> </html>
