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DNS Prefetch in HTML

Learn link rel=dns-prefetch: a tiny, cheap hint that looks up a server's address early. See what DNS is, what the hint saves, how it differs from preconnect, and which hosts deserve it.

Preconnect in HTML

Learn link rel=preconnect: open the connection to an important server early. Understand why crossorigin matters, how many to use, and how to pick the right origins, with a connection lab and an origin picker.