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<html><head><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script><script>$(document).ready(function(){ $(":checked").wrap("<span style='background-color:red'>");});</script></head><body><form action="#"> Name: <input type="text" name="user"><br> I have a bike: <input type="checkbox" name="vehicle" value="Bike"><br> I have a car: <input type="checkbox" name="vehicle" value="Car" checked="checked"><br> I have an airplane: <input type="checkbox" name="vehicle" value="Airplane"><br> <input type="submit"></form><p>Note: We use jQuerys .wrap method to highlight the selected elements, because Firefox does not support background color on checkboxes.</p></body><!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_sel_checked by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 05 Sep 2022 15:43:22 GMT --></html>