It's actually true that there is a thing you can use, specifically, a gridded interface you use to place interactive elements and define their behavior. I'm not saying that to diminish his accomplishment; if anything, it's to laud them for theirs. But he has a history of discovering some new concept and then effortlessly mastering it in a way that is profoundly annoying.
Do you remember when Flash was a thing? I mean, obviously Flash is still a thing, like a haunted stump is a thing, but Flash was creating a Web for a little while there that was more like The Future and less like a phonebook that required thousands of dollars to access. I came back to the apartment from work one day, and before I knew he was even interested in Flash he'd made a massive, interesting site in it which was one thing but he'd also perfectly cut a bunch of audio loops as well, which I considered my thing. So I was mostly mad.
When we first made this site twenty years ago, Gabe handled all the art and I handled the HTML - I learned how to make a table for just that purpose. But I arranged things in a way that stretched it out because the menu items are all one one side and there was just a fallow field on one side. That hole - then a material one, now a conceptual one, I filled for no other reason than that gap. I can't stress this enough: I have written an article to accompany the comics for twenty years just to avoid learning something.
He's over at his desk now, drawing crops on his iPad pro - "stream crops" you'll be able to click on to water, grow, and ultimately harvest with Sparks. You can also build a little house around the avatars he's made already. By comparison, I learned a cool word over the weekend - but I've already forgotten it.