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Test Info:

<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<html>
<style>
summary {
display: table-cell;
}
</style>
<body>
<details open>
<p>This is the details.</p>
<!-- Make summary the second element child so that layout will try to
render it as the first child. -->
<summary>Summary
<div>Block in summary</div>
</summary>
</details>
</body>
</html>