Breaking Change: Media Queries Level 4

{% compatibility 'dart: "1.56.0"', 'libsass: false', 'ruby: false' %}{% endcompatibility %}

Because Sass supports almost any Sass expression in parenthesized media conditions, there were a few constructs whose meaning was changed by adding full support for Media Queries Level 4. Specifically:

• @media (not (foo)) was historically interpreted by Sass as meaning @media (#{not (foo)}), and so compiled to @media (false).

• @media ((foo) and (bar)) and @media ((foo) or (bar)) were similarly interpreted as SassScript's logical operators, compiling to @media (bar) and @media (foo) respectively.

Fortunately, these came up very infrequently in practice.

Transition Period

{% compatibility 'dart: "1.54.0"', 'libsass: false', 'ruby: false' %}{% endcompatibility %}

First, we emitted deprecation warnings for the previous ambiguous cases. These will have suggestions for how to preserve the existing behavior or how to use the new CSS syntax.

{% render 'silencing_deprecations' %}