After thinking a bit more, I think I was wrong in the previous comment, and I still cannot figure out a universal way to implement nesting rules efficiently without exponentially expanding the selectors. If we can resolve to use one-element-a-time semantic in #2895, and also to require balanced nesting selector in #2896, and maybe disallowing `:not()` to contain `&`, there can be a decent approach to implement but I'm not completely sure. -- GitHub Notification of comment by upsuper Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2881#issuecomment-403326434 using your GitHub accountReceived on Sunday, 8 July 2018 23:44:01 UTC
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