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31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
---
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title: 'Breaking Change: Media Queries Level 4'
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introduction: >
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Sass has added support for the CSS Media Queries Level 4 specification. This
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originally conflicted with some Sass-specific syntax, so this syntax was
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deprecated and is now interpreted according to the CSS standard.
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---
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{% compatibility 'dart: 1.56.0', 'libsass: false', 'ruby: false' %}{% endcompatibility %}
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Because Sass supports almost any Sass expression in parenthesized media
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conditions, there were a few constructs whose meaning was changed by adding full
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support for Media Queries Level 4. Specifically:
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- `@media (not (foo))` was historically interpreted by Sass as meaning
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`@media (#{not (foo)})`, and so compiled to `@media (false)`.
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- `@media ((foo) and (bar))` and `@media ((foo) or (bar))` were similarly
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interpreted as SassScript's logical operators, compiling to `@media (bar)` and
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`@media (foo)` respectively.
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Fortunately, these came up very infrequently in practice.
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## Transition Period
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{% compatibility 'dart: 1.54.0', 'libsass: false', 'ruby: false' %}{% endcompatibility %}
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First, we emitted deprecation warnings for the previous ambiguous cases. These
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will have suggestions for how to preserve the existing behavior or how to use
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the new CSS syntax.
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