The ol tag starts a numbered list. It can contain only li (119) tags,
which denote the various elements in the list. Each item will be preceded by a number.
The ol tag can occur inside a text, but surrounding text should always be enclosed in
a p (130) paragraph tag, i.e. an ol tag should occur always at the same level as a p
tag.
Example:
<p> some text before</p>
<ol>
<li>First item in the list</li>
<li>Second item in the list</li>
</ol>