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Re: [csswg-drafts] [mediaqueries-4] Change when any-* evaluate to 'none'

From: Florian Rivoal via GitHub <sysbot+gh@w3.org>
Date: Wed, 23 Nov 2016 12:24:41 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-262499948-1479903879-sysbot+gh@w3.org>
> perhaps the features should be more tightly limited/defined to only 
apply to "pointer inputs" per se
I think that with the current way none is defined, the spec does not 
need to distinguish:
* If there are no other input device at all, the presence of an input 
that cannot hover is treated the same as the absence of any input 
device, and both `hover` and `any-hover` match `none`.
* if there are other input devices, the addition of a device that 
cannot hover has no impact on the result of the hover / any-hover MQs.

In both cases, excluding from consideration the device that cannot 
hover on the basis that it is not a pointing device would have no 
impact on the MQ.

This distinction would be come meaningful if we were to follow to 
start allowing `none` and `hover` to match at the same time.

If I'm understanding you write, what you're after is the ability to 
distinguish between the absence of a pointing device, and the presence
 of a pointing device that cannot hover. In the case of the primary 
one, we can already do so: `(pointer) and (hover: none)` vs `(pointer:
 none)`. We can also distinguish using any-* between the complete 
absence of any pointing device at all, and the presence of one or more
 pointing devices, none of which is able to hover: `(any-pointer) and 
(any-hover: none)` vs `(any-pointer: none)`.

What we cannot tell apart is when there is one or more pointing 
devices some of which can hover, and one or more pointing devices, all
 of which can hover. I have a bit of a hard time imagining what a web 
page would do with that information. I can sort of imagine wanting 
more fine grained information, and iterating in javascript through an 
exhaustive list of input devices, each with detailed information, but 
as long as you're querying about the combined capabilities of all 
input devices, I don’t quite see it.

Would you be so kind as to give me an example of how one would use 

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Received on Wednesday, 23 November 2016 12:24:48 UTC

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