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<!DOCTYPE html>
<html class=reftest-wait>
<script src="resources/fallback-helper.js"></script>
<body>
<script>
(async () => {
await generateReferenceFrame(15,200,800,`
[popover] {
position-area: top span-left;
position-try: unset;
height: 100%;
overflow: auto;
align-self: stretch;
}
`);
})();
</script>