Tooltip
Show a tooltip using the aria-label attribute. Appears
on hover and on keyboard focus.
Default
<button aria-label="Add to library">Hover or focus</button>Placement
Use data-placement to control which side the tooltip
appears on. Defaults to top.
<button aria-label="Top" data-placement="top">Top</button>
<button aria-label="Bottom" data-placement="bottom">Bottom</button>
<button aria-label="Left" data-placement="left">Left</button>
<button aria-label="Right" data-placement="right">Right</button>