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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-anchor-nested-display.tentative.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<link rel=match href="popover-anchor-nested-display-ref.html">

<button id=main-menu-button popovertarget=main-menu>Show menu</button>

<div id=main-menu popover anchor=main-menu-button>
  <div>Foo</div>
  <button id=nested-menu-button popovertarget=nested-menu>
    Show nested menu
  </button>
  <div>Bar</div>
</div>

<div id=nested-menu popover anchor=nested-menu-button>
  Baz
</div>

<style>
#main-menu-button {
  position: absolute;
  top: 200px;
  left: 100px;
  width: 100px;
}

#main-menu {
  top: anchor(top);
  left: anchor(right);
  width: 150px;
  line-height: 20px;
}

#nested-menu-button {
  width: 100%;
}

#nested-menu {
  top: anchor(top);
  left: anchor(right);
}

[popover] {
  border: 0;
  margin: 0;
  padding: 0;
}
</style>

<script>
document.getElementById('main-menu-button').click();
document.getElementById('nested-menu-button').click();
</script>