Re: [whatwg/fetch] Define the "Preload Cache" (#590)

> Preload (IMO) should be roughly equivalent to asking the document whether it currently has a `<link rel="preload">` in the DOM and querying that element for its response,

I like that. It makes it pretty easy to explain the scope of preloading to developers. Although, you'd need to figure out the behaviour of multiple preload elements in the same page with the same url etc.

> and this is separate from any cache mechanism.

If you mean it comes _before_ other cache mechanisms, then yeah. I drew this diagram a few years back ([source](https://jakearchibald.com/2017/h2-push-tougher-than-i-thought/#map-of-fetching)):

![jakearchibald com_2017_h2-push-tougher-than-i-thought_ (1) (1)](https://user-images.githubusercontent.com/93594/134490293-2bf342f8-627e-42a3-beb4-5cd3e22e2d62.png)



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