I'm blow away at what Devs are able to do within a browser nowadays.
More that browsers have gotten sprouted downwards and obtained all sorts of low level access than older browsers didn't use to have. I believe this is partially why tools that were meant to just render markup have gotten so complex to build that a small team of devs is not enough to build a modern browser anymore. And by that I mean from scratch, not just piggybacking on Chromium or Gecko.
I’m very mixed about WASM. It’s clearly a very cool technology, and enables cool things by allowing native performance without needing multi-platform support.
But at the same time, it provides a vector for foreign, non-free software to run on my computer. Every time someone sends me a Google doc blocking printing/copying (on _my_ computer!), it makes me want to join a monastery.