The best candidate is `aria-label`, followed by `description`.
Most of the existing elements already have these defined, so try to route it as the tooltip instead of having to explicitly define tooltips everywhere through a redundant `title` or <Tooltip> tag.
Minor side-effect:
This will cancel off any effect from a parent <Tooltip>, i.e. might confuse future developers who are trying to do "<Tooltip><Button></Button></Tooltip>".
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