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Initial prototype of a `<toolbar>` element is coming along. Largely piggybacks off the focusgroup code so it's actually quite simple to do. Lots to discuss and tweak before it's finished but got to start somewhere.

It's not all that different right now, it's akin to `<div focusgroup="toolbar">`. In fact it's using focusgroup under the hood in my prototype just without spawning the attribute. But there's potentially some extra things we can do, e.g. stricter key conflict handling.