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This css selector looks like it would be slow, which, if true, would be one reason not to use it.

The difference in selector speed is negligible. Choosing minimal perf gains over greatly improved ergonomics is pain.

It was last an issue with IE7 and 8 [0], an era we don’t like to talk about.

Did you just call eliminating quadratic behaviour a negligible gain in the context of graphics rendering?

I’m pretty sure you’re wrong there.