Idk how I missed that. I only saw the desktop program part and the languages listed after it. I completely overlooked the website part, unless it was edited or something. But yeah, for websites JavaScript is the go-to for front-end and there are even some decent back-end options these days, although development and deployment gets a lot more complicated if you go that route. Java is still popular as a backend language for website development, and there are frameworks that have out of the box components that give you the JavaScript for free, but they're typically expensive enterprise solutions like Adobe Experience Manager.

Edit: I just checked and it was edited, so they might have added that part after I wrote my reply.