[qutebrowser] Missing checkboxes

[Adam Cooper]

Hi,
Here are links to screenshots of a page in both Qutebrowser v2.5 and Chromium
v100. 

Qutebrowser: https://i.imgur.com/xMM45Qq.png
Chromium: https://i.imgur.com/elJhDXT.png

In the Chromium page, the checkboxes next to list items appear as
intended. The checkboxes are missing from the Qutebrowser page.

I'm writing in case others have noticed something like this. I searched
the GitHub issues, but didn't find anything. My front-end chops are a
little rusty, but of course I will seek an explanation in the source
code.

Thanks in advance for any insights,
Adam