sass-site/source/documentation/values.html.md

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---
title: Values
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introduction: >
Sass supports a number of value types, most of which come straight from CSS.
Every [expression](syntax/structure#expressions) produces a value,
[variables](variables) hold values. Most value types come straight from CSS:
overview: true
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---
* [Numbers](values/numbers), which may or may not have units, like `12` or
`100px`.
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* [Strings](values/strings), which may or may not have quotes, like
`"Helvetica Neue"` or `bold`.
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* [Colors](values/colors), which can be referred to by their hex representation
or by name, like `#c6538c` or `blue`, or returned from functions, like
`rgb(107, 113, 127)` or `hsl(210, 100%, 20%)`.
* [Lists of values](values/lists), which may be separated by spaces or commas
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and which may be enclosed in square brackets or no brackets at all, like
`1.5em 1em 0 2em`, `Helvetica, Arial, sans-serif`, or `[col1-start]`.
A few more are specific to Sass:
* The [boolean](values/booleans) values `true` and `false`.
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* The singleton [`null`](values/null) value.
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* [Maps](values/maps) that associate values with keys, like
`("background": red, "foreground": pink)`.
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* [Function references](values/functions) returned by [`get-function()`][] and
called with [`call()`][].
[`get-function()`]: functions/meta#get-function
[`call()`]: functions/meta#call