<p>These are all equivalent:</p>
<blockquote>
<blockquote>
<p>nested
blockquote</p>
</blockquote>
</blockquote>
<blockquote>
<blockquote>
<p>nested
blockquote</p>
</blockquote>
</blockquote>
<blockquote>
<blockquote>
<p>nested
blockquote</p>
</blockquote>
</blockquote>
<blockquote>
<blockquote>
<p>nested
blockquote</p>
</blockquote>
</blockquote>
<p>This is not:</p>
<blockquote>
<p>nested</p>
<blockquote>
<p>blockquote</p>
</blockquote>
</blockquote>