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    sass

Syntactically Awesome Stylesheets (compiles to css)


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Package description

What is sass?

The sass npm package is a preprocessor scripting language that is interpreted or compiled into Cascading Style Sheets (CSS). It enables developers to use variables, nested rules, mixins, functions, and more, which can help in writing CSS in a more structured and maintainable way.

What are sass's main functionalities?

Variables

Variables allow you to store values that you can reuse throughout your stylesheet.

$primary-color: #333;

body {
  color: $primary-color;
}

Nesting

Nesting enables you to nest your CSS selectors in a way that follows the same visual hierarchy of your HTML.

nav {
  ul {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  li { display: inline-block; }

  a {
    display: block;
    padding: 6px 12px;
    text-decoration: none;
  }
}

Partials and Import

Partials are Sass files named with a leading underscore. You can import these partials into other Sass files to modularize your CSS and help keep things easier to maintain.

// _reset.scss
html,
body,
ul,
ol {
  margin: 0;
  padding: 0;
}

// main.scss
@import 'reset';
body {
  font-family: sans-serif;
}

Mixins

Mixins allow you to define styles that can be reused throughout your stylesheet.

@mixin border-radius($radius) {
  -webkit-border-radius: $radius;
     -moz-border-radius: $radius;
      -ms-border-radius: $radius;
          border-radius: $radius;
}

.box { @include border-radius(10px); }

Extend/Inheritance

Extend/Inheritance lets you share a set of CSS properties from one selector to another.

.message {
  border: 1px solid #ccc;
  padding: 10px;
  color: #333;
}

.success {
  @extend .message;
  border-color: green;
}

Operators

Sass supports standard math operators like +, -, *, /, and %.

.container {
  width: 100%;
}
.article {
  width: 600px / 960px * 100%;
}

Other packages similar to sass

Readme

Source

Sass.js

JavaScript implementation of Sass. Great for node.js and other frameworks supporting the CommonJS module system.

Installation

npm:

  $ npm install sass

Usage

var sass = require('sass')
sass.render('... string of sass ...')
// => '... string of css ...'

sass.collect('... string of sass ...')
// => { selectors: [...], variables: { ... }, mixins: { ... }}

Comments

// foo
body
  // bar
  a
    :color #fff
    

compiles to

body a {
  color: #fff;}
  

Variables

!red = #ff0000
body
  :color !red
  

and

red: #ff0000
body
  :color !red
 

compile to

body {
  color: #ff0000;}

Selector Continuations

a
  :color #fff
  &:hover
    :color #000
  &.active
    :background #888
    &:hover
      :color #fff
      

compiles to

a {
  color: #fff;}

a:hover {
  color: #000;}

a.active {
  background: #888;}

a.active:hover {
  color: #fff;}
  

Literal JavaScript

type: "solid"
size: 1
input
  :border { parseInt(size) + 1 }px {type} #000
  

compiles to

input {
  border: 2px "solid" #000;}
  

Property Expansion

div
  =border-radius 5px
  

compiles to

div {
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;}
  

Mixins

 +large
   :font-size 15px
 +striped
   tr
     :background #fff
     +large
     &:odd
       :background #000
 table
   +striped
   :border none
   

compiles to

table {
  border: none;}
table tr {
  background: #fff;}
table tr {
  font-size: 15px;}
table tr:odd {
  background: #000;}

Testing

Update Git submodules and execute: $ make test

More Information

  • Featured in Advanced JavaScript e-book for only $4

License

(The MIT License)

Copyright (c) 2009 TJ Holowaychuk <tj@vision-media.ca>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Last updated on 06 Jun 2017

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