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<!DOCTYPE html>
<meta charset="utf-8">
<title>reference for details:open pseudoclass</title>
<style>
details {
color: green;
margin-left: 5em;
}
</style>
<p>The details element should be open, green, and indented:</p>
<details open=true>
<summary>Summary</summary>
<p>Detailed content</p>
</details>