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# jQuery UI Example - Add Class Adds a specified class to each element in the matched set when animated style changes. For more details about the `.addClass()` method, please see the API documentation [.addClass()](#). ## .addClass() Demo Click the button to preview the effect. .toggler { width: 500px; height: 200px; position: relative; } #button { padding: .5em 1em; text-decoration: none; } #effect { width: 240px; padding: 1em; font-size: 1.2em; border: 1px solid #000; background: #eee; color: #333; } .newClass { text-indent: 40px; letter-spacing: .4em; width: 410px; height: 100px; padding: 30px; margin: 10px; font-size: 1.6em; } $(function() { $( "#button" ).click(function() { $( "#effect" ).addClass( "newClass", 1000, callback ); return false; }); function callback() { setTimeout(function() { $( "#effect" ).removeClass( "newClass" ); }, 1500 ); } }); Run Effect (#)