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Re: [mediaqueries] "not" is inconsistent

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Tue, 7 Oct 2014 10:26:05 -0700
Message-ID: <CAAWBYDDHsgwaVgHxm_Ae-B5wW2u37T3aYJ1x0Fefq=kgO4iA7g@mail.gmail.com>
To: Simon Pieters <simonp@opera.com>
Cc: "www-style@w3.org" <www-style@w3.org>
On Tue, Oct 7, 2014 at 4:26 AM, Simon Pieters <simonp@opera.com> wrote:
> On Tue, 07 Oct 2014 11:35:40 +0200, Simon Pieters <simonp@opera.com> wrote:
>> The "not" keyword is inconsistent in whether the result is negated for
>> invalid things.
>>
>> "If it contains a <general-enclosed> child term, the result is false."
>>
>> not (123) -> true
>>
>>
>> "A media query that does not match the grammar in the previous section
>> must be replaced by not all during parsing."
>>
>> not (!) -> false
>>
>>
>> "An unknown <media-type> must be treated as not matching."
>>
>> not unknown -> true
>>
>>
>> "An unknown <mf-name> or <mf-value>, or disallowed <mf-value>, must make
>> the entire <media-query> be replaced by not all."
>>
>> not (unknown) -> false
>>
>>
>> Is the above intended?
>
>
> Looking at MQ3, there is no <general-enclosed> and so:
>
> not (123) -> false
>
> This matches gecko/blink/webkit/presto/IE11
>
> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/3240
>
> Since <media-query-list> parsing is not grammar-based, what purpose does
> <general-enclosed> serve?

Allowing you to write things like "(min-width: 50px) or
(new-unknown-thing: foo)" without losing the entire expression.

~TJ
Received on Tuesday, 7 October 2014 17:26:52 UTC

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