:has() syntax was recently supported in Firefox 121:

https://developer.mozilla.org/en-US/docs/Web/CSS/:has

Works great on Firefox 126 on MacOS, you need to upgrade!

Why should it? It’s clearly an article about doing neat things with CSS, not the technicalities of different degrees of randomness. Perhaps we should not be throwing around the word “should” so loosely…

It’s a toy tic-tac-toe game with no monetary or life threatening implications, no need to bring the security mindset into this discussion.

If someone copies this code and uses it in a non-toy application, well, that’s on them.

Sorry, we’ll be sure to only mention cryptographically strong tic-tac-toe games in the future.

The word "randomness" in the title is in quotation marks, which seems like a pretty clear indication that it's not referring to true randomness but to something random-like.

Next week: making a tic-tac-toe game look decent using JavaScript.

How am I going to make it look good? I dont have the CSS skills for that