<div id="popoverContainer" popover>
  <p>This is the popover content.</p>
</div>

<button type="button" popovertarget="popoverContainer">Toggle Popover</button>
<div id= "popoverContainer" popover>
  <p>This is the popover content.</p>
</div>

* {
  font-size: 1rem;
}

button {
  margin: .5rem;
}