Apply focus to first focusable element in toggled block

[jeremyfelt]

[jeremyfelt]

Am I correct in that:

1. If the content being toggled is purely informational and has real focusable element, we should not do anything.
2. If the content being toggled has interactive elements/links/etc..., we should focus on the first focusable element.

And then, if that's correct, once content within the toggled area is focused, we need to watch for Escape as a method to close the toggled area and re-assign focus to the toggle block.

/cc @philcable @slocker3

[slocker3]

This seems correct to me!