[lelanthran]

> What other elements should I add?

Not really an element, but `popover` attributes for elements, maybe?

Recently I've been using fieldset+legend to great effect for titled input forms. In fact I've used it almost exclusively in my last contract.

Some other ones that too few people use: progress, cite, sub/sup, datalist (very useful), and search (also very useful as a busy indicator when used with no percentage).