[catach]

Luckily Reader Mode or disabling CSS takes care of the oddity.

[tzs]

I wonder if that would still work if the ligature were done in Unicode instead of CSS?

[catach]

Interesting question! The st and ct ligatures used in the article don't seem to be part of the precomposed Latin ligature set, and what is there strikes me as far less obnoxious [1,2]. I expect it's possible to hack something together with combining characters, but also that the visual result would be far too ugly for the tastes of anyone who was desiring ligatures in the first place.

[1] https://en.wikipedia.org/wiki/Ligature_(writing)#Ligatures_i...

[2] https://superuser.com/questions/669130/double-latin-letters-...