“The power of the Web is in its universality. Access by everyone regardless of disability is an essential aspect.”
—Tim Berners-Lee, W3C Director and inventor of the World Wide Web
i am in process of making such drop downs which will work on all major browsers, without adding any invalid html tags to the markup, and still which are 100% W3c compatible.
right now i have developed a select box with similar features( not drop down menus).
you can test it on PSPL Multi Select Box, Select without pressing ALT key
well i will make those very soon,
most probably the version 1.0.0 of "PSPL drop down menus" will be available on the same URL as above, so stay tuned.