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

> I think the "multiple" results for no-cache for images at least come from https://html.spec.whatwg.org/#the-list-of-available-images, and I think generally they are needed for compat (e.g., different CSS image loads from a style change should result in the same image).
> 
> For stylesheets in the same document it's also long-standing behavior of Gecko at least.

Yea, that makes sense to me. I'm surprised of the "once" behavior in Chrome though, seems like preload does something extra that counteracts that memory cache.

Note also that the tests activate many moving parts, there could always be some fragile mistake in them (those fragile mistakes unfortunately also happen in websites that try to take advantage of preload, unfortunately).

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