valor-software/ng2-bootstrap

<button type="button" class="btn btn-default btn-secondary mb-2"
        tooltip="Vivamus sagittis lacus vel augue laoreet rutrum faucibus."
        placement="top">
  Tooltip on top
</button>

<button type="button" class="btn btn-default btn-secondary mb-2"
        tooltip="Vivamus sagittis lacus vel augue laoreet rutrum faucibus."
        placement="right">
  Tooltip on right
</button>

<button type="button" class="btn btn-default btn-secondary mb-2"
        tooltip="Vivamus sagittis lacus vel augue laoreet rutrum faucibus."
        placement="auto">
  Tooltip auto
</button>

<button type="button" class="btn btn-default btn-secondary mb-2"
        tooltip="Vivamus sagittis lacus vel augue laoreet rutrum faucibus."
        placement="left">
  Tooltip on left
</button>

<button type="button" class="btn btn-default btn-secondary mb-2"
        tooltip="Vivamus sagittis lacus vel augue laoreet rutrum faucibus."
        placement="bottom">
  Tooltip on bottom
</button>