There are several instances of escaped HTML in the latest issue of The Overflow, Sufficiently advanced HTML conversion feels like magic:
Further down there's another
Thank you for taking the time to report this problem.
I've spoken with the Marketing team, which runs the blog; apparently, this was due to an error in our content management system. That issue has now been fixed, so this shouldn't happen again in future blog posts – but that doesn't automatically fix these HTML issues in previously published blog posts.
In the meantime, the HTML issues in this particular blog post have been fixed, as Justin's answer notes.