I don’t do a lot of front end dev. Just some personal projects here and there and I usually just slap Bootstrap on it to make things look reasonable. I had to do a bit for work and man, when I started actually reading the docs I was surprised to find things like form validation [1] out of the box! There were a few others that I forget now, but I was pleasantly surprised at how much I _didn’t_ have to do. I wound up needing no extra JavaScript.

[1] https://developer.mozilla.org/en-US/docs/Learn/Forms/HTML5_i...