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jh3yy Hmmm, good question. You might actually know better than me what new features you use often for CSS art, but have more limited/recent support. Container Queries might be an extreme challenge, since there's nothing quite similar to fall back on — but would be great to see.
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jh3yy But others that come to mind might be like… - conic gradients - backdrop-filter - new color formats & functions? It'd be fun to think of something super-new, so you can watch the same art "ripen" over time… 😛