HTML standard reads Attribution for the quotation, if any, must be placed outside the blockquote element.
In the current <blockquote> component, the attribution (using a <cite> element) is placed inside the <blockquote>.
Example:
<blockquote class="pull">
<p>I do what I do because it’s right! Because it’s decent! And above all, it’s kind! It’s just that…</p>
<cite>John Smith, TARDIS Inc.</cite>
</blockquote>