Heh, they didn't seem to test their University website[1] before publising it. There is a gaping:

  <!-- End Google Tag Manager -->
  Additionally, paste this code immediately after the opening <body> tag:
  <!-- Google Tag Manager (noscript) -->

In the source code. That “<body>” isn't escaped either, which makes the whole thing borked-up.

This is why we need XHTML.

[1] https://university.cockroachlabs.com/catalog