I'm doing a web browser from scratch, no web or js engine reused (only general-purpose libraries allowed), in my spare time/tokens on a Claude $100 sub.
After a month or so, many simple sites work, and now the bottleneck is the stupid amount of JS sites use for everything, and Cloudflare which doesn't like someone using a non-officially-approved browser.
Absolutely not a replacement for Chrome or Ladybird, but it can be done already.