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| title | introduction |
|---|---|
| Breaking Change: Media Queries Level 4 | Sass has added support for the CSS Media Queries Level 4 specification. This originally conflicted with some Sass-specific syntax, so this syntax was deprecated and is now interpreted according to the CSS standard. |
{% 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:
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@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.