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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $(":selected").css("background-color", "red"); }); </script> </head> <body> <form action=""> Name: <input type="text" name="user"><br> Car: <select> <option>Volvo</option> <option selected="selected">Saab</option> <option>Mercedes</option> <option>Audi</option> </select> </form> </body> </html>