Browser & Web Performance · Senior · Question 64 of 75

What's the point of `Link: <...>; rel=preload` sent as an HTTP header instead of in HTML?

1It's required for preloading fonts
✓Correct answer: The browser can start the fetch as soon as the headers arrive, before it parses any HTML, and CDNs can turn it into 103 Early Hints
3Header preloads are always higher priority than everything else

Explanation

It's useful when the HTML is slow to generate or when you can't edit the markup.

Further reading

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