Hi,
In bug 1422225 I plan to land most of the syntax improvements to
mediaqueries-4.
Some of the features included are:
* Allowing operators such as >, <, >=, or <= in media feature
expressions, which allows to properly exclude media queries in a way
min-* and max-* cannot, like:
@media (width >= 900px) { some rules }
@media (width < 900px) { some other rules }
Guarantees that either `some rules` or `some other rules` apply, which
is something that is not guaranteed by the existing syntax (see [1] or
[2], for example).
* Or expressions, and arbitrary expression nesting like:
@media ((width >= 500px) and (width <= 900px)) or (not
(orientation: portrait))
Things that are _not_ included are:
* The range syntax, or allowing values before the feature name, that is:
@media (500px > width) or (500px < width < 900px)
This is nice, but not so trivial to implement, and you can either
reverse the expression (`(width <= 500px)` in the first case), or use
the expanded version of it using `and` expressions for the second.
* The changes to serialization and parsing that allows basically
anything in a feature expression to be valid, that is, treating as a
valid media query something like:
@media (orientation: portrait) or (garbage)
Bug 1469174 and bug 1469173 are tracking those two, respectively.
Let me know if you find unknown issues, or think we shouldn't ship this.
Thanks!
-- Emilio
[1]:
http://damienclarke.me/code/posts/those-1px-gaps-between-media-queries-can-be-a-problem
[2]: https://github.com/twbs/bootstrap/issues/19197
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