* update dialog playground example
Includes a generic `Button` component that has explicit focus styles.
* keep track of "focus" history
Safari doesn't "focus" buttons when you mousedown on them. This means
that we don't capture the correct element to restore focus to when
closing a `Dialog` for example.
Now, we will make sure to keep track of a list of last "focused" items.
We do this by also capturing elements when you "click", "mousedown" or
"focus".
* let's use a button instead of a div in tests
* make `target` for Vue consistent with React
* update changelog
Robin Malfait
7e150e408c