It's revenge against anyone with certain kinds of visual impairments and/or concentration issues because the ex-spouse of the author which turned out to be a terrible person had such.
(sarcasm try 2)
It's revenge against anyone using JS on the net with the author trying to subtle hint that JS is bad.
(realistic)
It's probably on of:
- the website is a static view of some collaborative tool which has that functionality build in by default
- some form of well intended but not well working functionality add to the site as it was some form of school/study project, in that case I'm worried about the author suffering unexpected very much higher cost due to it ending up on HN ...