I don’t think browsers should implement this. They’d need a much more robust parser with fewer edge cases than what SCSS implement - but this then means you can

I don’t think browsers should implement this. They’d need a much more robust parser with fewer edge cases than what SCSS implement - but this then means you can’t do stuff like BEM nesting. It’s also not necessary - you can do just fine not nesting. If you have so many selectors on one rule that the nesting is really benefitting you, it’s very likely you have bigger problems. They should just leave it to build tools.