What is popper js

Popper js example

#arrow,
#arrow::before {
  position: absolute;
  width: 8px;
  height: 8px;
  z-index: -1;
}

#arrow::before {
  content: '';
  transform: rotate(45deg);
  background: #333;
}

Source: popper.js.org

Popper js example

<div id="tooltip" role="tooltip">
  My tooltip
  <div id="arrow" data-popper-arrow></div>
</div>

Source: popper.js.org

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