Show HN: EQCSS, the Element Query polyfill hits v1.0.0
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I think of it can be considered a polyfill and plugin at the same time, though it's quickly turning into a language extension for CSS with things unrelated to element queries that take advantage of the CSS scoping that the element queries plugin makes possible.
Check out some of the features possibly coming soon: https://github.com/eqcss/eqcss/issues/3