new selectors and nesting

[leeoniya]

• https://www.w3.org/TR/css-nesting-1/
• :has
• :matches

[tornqvist]

I'm getting JavaScript heap out of memory errors when using the :has selector. I guess it's not the easiest feature to implement but would some kind of meantime workaround be possible, e.g. skipping certain selector by adding a comment, like most linting libraries work?