I am using jquery ui which provides many styles you can apply to elements.

For my menu I would like to set the style for the elements to be something like this:
class="fg-button ui-state-default fg-button-icon-solo ui-corner-all ui-state-active"

How do I do that with the menu defined like this:
<span class="lift:Menu.builder "></span>

-- on the group David replied:

I don't think it's possible. It's looking like there's no way to get the attribute namespaces with the designer friendly snippet invocation.

Please open a ticket and assign it to me for 2.4-M2 and reference this thread.