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<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<html>
<style>
summary {
display: inline; /* ::first-line appiles only to inline element. */
}
details::first-line {
color: blue;
}
</style>
<body>
<details>
<summary>Summary
<!-- Need ib-split so that the summary has multiple frames. -->
<div>Block in summary</div>
</summary>
<p>This is the details.</p>
</details>
</body>
</html>