SE Chat already knows how to render xkcd links: you get the comic image, hyperlinked to the URL, with the title text behind the image:
<div class="onebox ob-xkcd">
<a rel="nofollow" href="https://xkcd.com/1607">
<img src="http://imgs.xkcd.com/comics/supreme_court.png" title="Writing for the majority, Justice Kennedy called the man's arguments that he could be either Alito or Ginsburg "surprisingly compelling, but ultimately unconvincing."" alt="Writing for the majority, Justice Kennedy called the man's arguments that he could be either Alito or Ginsburg "surprisingly compelling, but ultimately unconvincing."">
</a>
</div>
On mobile devices, though, it's practically impossible to get the title text for an image. On xkcd in particular, the title text is usually a key part of the joke, leaving mobile users missing out on half the fun.
Can we get Obie to print the title text, perhaps as a caption beneath the image?
