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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-and-svg.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Popover is only effective on HTMLElement, not on svg element</title>
<link rel="author" href="mailto:[email protected]">
<link rel=help href="https://html.spec.whatwg.org/#the-popover-attribute">
<link rel="match" href="popover-and-svg-ref.html">
<style>
svg {
  width: 100px;
  height: 100px;
  background-color:green;
}
[popover] {
  top: 100px;
  bottom: auto;
}
</style>
<svg popover></svg>