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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ alert($("li").size()); }); }); </script> </head> <body> <button>Alert the number of li elements</button> <ul> <li>Coffee</li> <li>Milk</li> <li>Soda</li> </ul> </body> </html>