Re: [w3ctag/design-reviews] User Preference Media Features Client Hints Headers (#632)

Thanks for joining us @tomayac. 

One follow-up question: we were wondering how this approach compares to the use of H/2 or H/3 server push?

e.g. the HTML links to two stylesheets with appropriate media queries, when serving the original HTML request the server starts pushing both stylesheets. When the client parses the links to the stylesheets, it sees that one isn't necessary right now, so cancels the push of that stylesheet and instead adds it to a low-priority queue to fetch later.

While that approach will likely send a few packets of an unnecessary stylesheet, it also avoids the delay/round trip of the client hints as well as the additional header payload, so may lead to overall similar performance (if not better depending on the placement of the stylesheet links in the HTML). We'd love to see data comparing the two approaches in ideal cases. 

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