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I appreciate their minimalism too, but with http2 and http3 isn't this an anti-pattern? The overhead of loading an additional file is negligible in http2/3, but inlining causes you to have to re-download the CSS on every page instead of benefiting from the browser's cache.

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No because that additional CSS file can only be fetched after the initial HTML file has been fetched, not simultaneously; thus requiring another roundtrip to the server. (HTTP/2 Server Push promised otherwise but it was never implemented correctly.)

Latency being much more constraining than bandwidth, embedding a stylesheet that’s small is nearly always the correct tradeoff.

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