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<title>Details test</title>
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<p>This is a test.</p>
<details>
<summary>Command output</summary>
<pre>               total        used        free      shared  buff/cache   available
Mem:        61611112    14425648     3365848      173972    44683916    47185464
Swap:              0           0           0</pre>
</details>
<details open>
<summary>Another test</summary>
<p>This is a test.
<del>a</del>  <del>b</del>
<em> <b> <em> <i> word </i> </em></b>  </em>
</p>
</details>
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t = document.body.querySelectorAll("details")
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