Re: [w3ctag/design-reviews] Request for review: Preload (#202)

Hi @yoavweiss,

Thanks for raising this review with us, and congrats on the adoption. We have three points of feedback:

* There's a `nopush`, but no corresponding `push-only` (which would push but strip the header).  We note that Jake recommends doing this in [his H2 research](https://jakearchibald.com/2017/h2-push-tougher-than-i-thought/)
* If a client requests an HTML page, and the page has a link preload header for a logo image, but the server has two variants of that logo, PNG and WEBP, which do we push, given that the Accept header on the HTML request is not providing information about the client's preferred image formats.  Do we need some kind of Accept extension?
* We're nervous of developer confusion between prefetch and preload.  What efforts are being made to explain the difference between the two, and is it time to deprecate prefetch officially?

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