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39 lines
1.2 KiB
Markdown
39 lines
1.2 KiB
Markdown
# Built-In Modules
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Sass provides a number of built-in [modules] that may be loaded from URLs with
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the scheme `sass`. These modules have no extensions, CSS trees, dependencies, or
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source files. Their canonical URLs are the same as the URLs used to load them.
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[modules]: modules.md#module
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## Built-In Functions and Mixins
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Each function and mixin defined in a built-in modules is specified with a
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signature of the form
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<x><pre>
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[\<ident-token>] ArgumentDeclaration
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</pre></x>
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[\<ident-token>]: https://drafts.csswg.org/css-syntax-3/#ident-token-diagram
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followed by a procedure. It's available as a member (either function or mixin)
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in the module whose name is the value of the `<ident-token>`. When it's executed
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with `args`:
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* With an empty scope with no parent as the [current scope]:
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[current scope]: spec.md#scope
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* Evaluate `args` with the signature's `ArgumentDeclaration`.
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* Run the procedure, and return its result if this is a function.
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Built-in mixins don't accept content blocks unless explicitly specified
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otherwise.
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By convention, in these procedures `$var` is used as a shorthand for "the value
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of the variable `var` in the current scope".
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> In other words, `$var` is the value passed to the argument `$var`.
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