<!DOCTYPE html>
<html class=reftest-wait>
<script src="resources/fallback-helper.js"></script>

<body>
<script>
(async () => {
  await generateReferenceFrame(15,600,800,`
    [popover] {
      position-area: top span-right;
      position-try: unset;
      height: 100%;
      overflow: auto;
      align-self: stretch;
    }
  `);
})();
</script>
