There are a ton of standards at a glance, but when you look closer, you realize that much of it isn't implemented by other browsers either, and you only need a fraction of it to render 90%+ of the web. The last 10% will be a huge challenge, but we've got a long way to go before then.

The JavaScript engine is our own LibJS, currently sitting at 94.3% pass rate on https://test262.fyi/ (although the number might be a little outdated, it's supposed to be higher! Need to investigate this..)