alt Hacker NewsResponsive accordions are actually solved using CSS nowadays, but plenty of other things aren't, and the web has definitely needed an API or library like this for a long, long time. So it's great that we now have it.
Building something like this was certainly possible before, but it was a lot of effort. What's changed is simple: AI. It seems clear this library was mostly built in Cursor using an agent. That's not a criticism, it's a perfect use of AI to build something that we couldn't before.
> it's a perfect use of AI to build something that we couldn't before.
There's no reason why it couldn't have been built before. This is something that probably should exist as standard functionality, like what the Canvas API already includes. It's pretty basic functionality that every text renderer would include already at a lower level.