Selectability is an accessible, themable dropdown widget. It aims to provide the same native experience as an HTML <select>
element, but with much richer CSS styling.
You'll need to include jQuery first. Then, drop the selectability plugin into your project.
After that, the following snippet will change any selects to use Selectability instead:
$('select').selectability();
Selectability was originally developed for the National Assessment of Educational Progress (NAEP) in partnership with ETS, using funding from the US Department of Education.