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39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
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---
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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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Sass has historically supported a special parsing for the `@-moz-document` rule.
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As [Firefox dropped support for them], Sass will also drop support for the special
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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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<% example do %>
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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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<% end %>
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## Transition Period
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<% impl_status dart: '1.7.2', libsass: false, ruby: false %>
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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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