This is view source on the Threads homepage. Modern front end development is beyond satire at this point. In desktop Firefox with out-of-the-box uBlock Origin, it renders a completely black page.

At some point, people will rediscover the unfashionable idea that plain old HTML is pretty good if your goal is publishing bits of text on the internet. Maybe after that, if they want to make it look nice, they could look into these exciting new Cascading Style Sheets we hear so much about.