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ARIA Tooltip

http://w3c.github.io/aria-practices/#tooltip
http://w3c.github.io/aria/aria/aria.html#tooltip

I followed the ARIA pattern in this demo, but then I added aria-expanded on the button to tell the user that something is expanding and collapsing, however, the ARIA pattern does not mention anything about using aria-expanded.

Following ARIA pattern plus added aria-expanded

Following ARIA pattern except using aria-labelledby over -describedby plus added aria-expanded