HTML

Figure

<figure>
  <img src="path" title="sometitle" alt="altalt">
  <figcaption></figcaption>
</figure>

Embed XKCD

<!-- xkcd embed, for information about a xkcd comic, go to https://xkcd.com/number/info.0.json -->
<figure class="xkcd-embed">
  <a href="https://xkcd.com/number" target="_blank">
    <img src="imgurl" title="alttext" alt="https://xkcd.com/number">
  </a>
  <figcaption>
    "title" - created by <a href="http://xkcd.com">xkcd</a>
  </figcaption>
</figure>