Use of MaterialSideProfile creates invalid HTML (div in ul) #418
Description
Can be seen easily in https://gwtmaterialdesign.github.io/gwt-material-patterns/snapshot/#sidenav_push_header
The div.side-profile sits directly inside the ul.sidenavPushHeader. However, as far as I can tell, only li elements are allowed as children of ul elements.
Browsers largely don't seem to care about this restriction (after all, they have evolved in a wonderful world of broken websites that should still be presented as well as possible), but we're getting this flagged as an issue when inspecting our application for accessibility problems. It makes sense to me that some accessibility tools might not be as good at dealing with broken HTML as the major browsers, so it may be especially important in that area to ensure the HTML is valid.