Nib is a Stylus library, providing robust, cross-browser, CSS3 mixins.

• NodeJS – Server-side JavaScript runtime
• Harp – The static web server with built-in preprocessing

To install Nib, you can download this repository or use the Component package manager.

npm install -g component
component install harp/nib

Your project will look something like this…

myproject/            <-- your project root (or public dir if in framework-mode)
  |- components/      <-- harp puts components here
  |   +- harp-nib/    <-- where this lib gets installed
  |       …
  |- main.styl              <-- where you reference Nib
  +- index.jade             <-- where you reference main.css

From within a .less file in your project you can then @import Nib:

@import "components/harp-nib/styl"

Or, a portion of Nib:

@import "components/harp-nib/gradients"
@import "components/harp-nib/overflow"

Nib’s gradient support has been borrowed from Axis so no additional dependencies are necessary and is is by far the largest feature Nib provides. Not only is the syntax extremely similar to what you would normally write, it’s more forgiving and expands to vendor equivalents.

body {
  background: linear-gradient(top, white, black);
}

yields:

body {
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0, #fff), color-stop(1, #000));
  background: -webkit-linear-gradient(top, #fff 0%, #000 100%);
  background: -moz-linear-gradient(top, #fff 0%, #000 100%);
  background: linear-gradient(top, #fff 0%, #000 100%);
}

Any number of color stops may be provided:

body {
  background: linear-gradient(bottom left, white, red, blue, black);
}

Units may be placed before, or after the color:

body {
  background: linear-gradient(left, 80% red, #000);
  background: linear-gradient(top, #eee, 90% white, 10% black);
}

Creating a radial gradient is similar linear-gradient and also supports numerous color stops.

background: radial-gradient(white, red)

The most concusses option are a simple top-to-bottom two-colour gradient:

gradient(red, orange)

Or, pass in a base color, and the simple-gradient mixin will lighten and darken it by the specified strength and create a simple gradient with the base color being the middle/average.

simple-gradient(purple, 10%)

The position mixins absolute, fixed, and relative provide a shorthand variant to what is otherwise three CSS properties. The syntax is as follows:

fixed|absolute|relative: top|bottom [n] left|right [n]

The following example will default to (0,0):

#back-to-top {
  fixed: bottom right;
}

yielding:

#back-to-top {
  position: fixed;
  bottom: 0;
  right: 0;
}

You may also specify the units:

#back-to-top {
  fixed: bottom 10px right 5px;
}

yielding:

#back-to-top {
  position: fixed;
  bottom: 10px;
  right: 5px;
}

The clearfix mixin currently takes no arguments, so it may be called as shown below:

.clearfix {
  clearfix();
}

yielding:

.clearfix {
  zoom: 1;
}
.clearfix:before,
.clearfix:after {
  content: "";
  display: table;
}
.clearfix:after {
  clear: both;
}

Nib’s border-radius supports both the regular syntax as well as augmenting it to make the value more expressive.

button {
  border-radius: 1px 2px / 3px 4px;
}

button {
  border-radius: 5px;
}

button {
  border-radius: bottom 10px;
}

yielding:

button {
  -webkit-border-radius: 1px 2px/3px 4px;
  -moz-border-radius: 1px 2px/3px 4px;
  border-radius: 1px 2px/3px 4px;
}
button {
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  border-radius: 5px;
}
button {
  -moz-border-radius-topleft: 10px;
  -webkit-border-top-left-radius: 10px;
  border-top-left-radius: 10px;
  -moz-border-radius-bottomright: 10px;
  -webkit-border-bottom-right-radius: 10px;
  border-bottom-right-radius: 10px;
}

The image mixin allows you to define a background-image for both the normal image, and a doubled image for devices with a higher pixel ratio such as retina displays. This works by using a @media query to serve an "@2x" version of the file.

#logo {
  image: '/images/branding/logo.main.png'
}

#logo {
  image: '/images/branding/logo.main.png' 50px 100px
}

yields:

#logo {
  background-image: url("/images/branding/logo.main.png");
}
@media all and (-webkit-min-device-pixel-ratio: 1.5) {
  #logo {
    background-image: url("/images/branding/logo.main@2x.png");
    background-size: auto auto;
  }
}
#logo {
  background-image: url("/images/branding/logo.main.png");
}
@media all and (-webkit-min-device-pixel-ratio: 1.5) {
  #logo {
    background-image: url("/images/branding/logo.main@2x.png");
    background-size: 50px 100px;
  }
}

The overflow property is augmented with a "ellipsis" value, expanding to what you see below.

.description {
  overflow: ellipsis;
}

yielding:

button {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

Nib comes bundled with Eric Meyer’s style reset support, you can choose to apply the global or any specifics that you wish. To view the definitions view reset.styl

• global-reset()
• nested-reset()
• reset-font()
• reset-box-model()
• reset-body()
• reset-table()
• reset-table-cell()
• reset-html5()

The following properties follow vendor expansion much like border-radius, however without augmentation, as well as some aliases such as whitespace instead of white-space.

• no-wrap == nowrap
• whitespace == white-space
• box-shadow
• user-select
• column-count
• column-gap
• column-rule
• column-rule-color
• column-rule-width
• column-rule-style
• column-width
• background-size
• transform
• border-image
• transition
• transition-property
• transition-duration
• transition-timing-function
• transition-delay
• backface-visibility
• opacity
• box-sizing
• box-orient
• box-flex
• box-flex-group
• box-align
• box-pack
• box-direction
• animation
• animation-name
• animation-duration
• animation-delay
• animation-direction
• animation-iteration-count
• animation-timing-function
• animation-play-state
• animation-fill-mode
• border-image
• hyphens
• appearance

• Harp documentation
• Stylus documentation
• Nib documentation
• Axis’ gradient documentation

This component is Nib, which is MIT Licensed.