Remark 15.4.2. A little remark.
Remarks have restricted content, but they can be used to call out lots of important things for your readers.
<convention>, <insight>, <note>, <observation>, <remark>, and <warning>. The content of these elements is similar to what is allowed inside the <statement> of a theorem-like element. They allow an optional title, optional <idx> tags, and then a mixture of <p>, <blockquote>, and <pre>.
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<remark>
<title>A little remark</title>
<p>
Remarks have restricted content,
but they can be used to call out lots of important things for your readers.
</p>
</remark>