defer Media Queries 5 until CR

[tantek]

Closes #389. We will evaluate specific features individually or related sets of features instead until MQ5 reaches CR, and then we can re-open #389 for re-evaluation.

[annevk]

Given the third bullet point in https://www.w3.org/2019/Process-20190301/#candidate-rec wouldn't that be a tad too late?

[dbaron]

What I was suggesting in #389 was that we should not have "Mediaqueries 5" as an entry in the table at all; instead we should have features at the scope that we would make decisions about whether they're worthwhile or not. CSS modules, particularly for additions to mature features, tend to be a grab bag of features of totally different value and priority, so I think we should probably avoid trying to prioritize them as a whole. (Probably when we listed CSS Grid Layout Module Level 2 we should really have listed "subgrid", which is actually what we meant when we marked it as important. It's even in the ID!)

[martinthomson]

It might then be better to say "css-accessibility-media-queries" or "css-mq5-accessibility" as the target of this and say "worth prototyping".

[dbaron]

Closing in favor of resolving #393 instead, as I suggested above.