gecko-dev/layout/reftests/details-summary/open-single-summary.html

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HTML

<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
- http://creativecommons.org/publicdomain/zero/1.0/ -->
<html>
<body>
<details open>
<summary>Summary</summary>
<p>This is the details.</p>
</details>
</body>
</html>