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42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
---
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title: 'Breaking Change: -moz-document'
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introduction: >
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Firefox used to have a @-moz-document rule requiring special parsing. As
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support is removed from Firefox, Sass is in the process of removing support
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for parsing them.
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---
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{% markdown %}
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Sass has historically supported a special parsing for the `@-moz-document`
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rule. As [Firefox dropped support for them], Sass will also drop support for
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the special parsing and will treat it as an unknown at-rule.
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[Firefox dropped support for them]: https://web.archive.org/web/20200528221656/https://www.fxsitecompat.dev/en-CA/docs/2018/moz-document-support-has-been-dropped-except-for-empty-url-prefix/
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**There is one exception**: an empty url prefix function is still allowed, as
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that's used in a hack targetting Firefox.
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{% endmarkdown %}
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{% codeExample 'moz-document' %}
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@-moz-document url-prefix() {
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.error {
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color: red;
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}
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}
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===
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@-moz-document url-prefix()
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.error
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color: red
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{% endcodeExample %}
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{% markdown %}
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## Transition Period
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{% compatibility 'dart: 1.7.2', 'libsass: false', 'ruby: false' %}{% endcompatibility %}
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First, we'll emit deprecation warnings for all usages of `@-moz-document`
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except for the empty url-prefix hack.
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In Dart Sass 2.0, `@-moz-document` will be treated as an unknown at-rule.
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{% endmarkdown %}
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