You can edit / change the code and click run button
<!-- add code --> <!doctype html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>eq demo is here</title> <style> div { width: 100px; height: 100px; margin: 11px; float: left; border: 5px solid black; } .red{ background: red; } </style> <script src="../../../jquery-1.10.2.js"></script> <script>var clicky_site_ids = clicky_site_ids || []; clicky_site_ids.push(101319977);</script><script async src="//static.getclicky.com/js"></script></head> <body> <div></div> <div></div> <div></div> <div></div> <div></div> <script> $( "body" ).find( "div" ).eq( 2 ).addClass( "red" ); </script> </body> </html> <!-- add code -->