Nib 是一个小而精湛的 CSS3 预处理扩展，基于 Stylus CSS language, 而开发的，主要针对 CSS3 属性的跨浏览器兼容性。
body {
background: linear-gradient(top, white, black);
}
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%);
}
Installation
To get started you’ll first want to add nib to your package.json file, along with stylus. Once installed you can use Stylus and Nib with your Connect or Express application as shown in the following snippet. The simple .use(nib()) call is all that is required to expose itself to Stylus
var connect = require('connect')
, stylus = require('stylus')
, nib = require('nib');
var app = connect();
function compile(str, path) {
return stylus(str)
.set('filename', path)
.set('compress', true)
.use(nib());
}
app.use(stylus.middleware({
src: __dirname
, compile: compile
}));
app.listen(3000);
From within a .styl file you can then @import nib, or a portion of nib:
@import 'nib'
@import 'nib/gradients'
@import 'nib/buttons'
Rather than manually @import-ing nib within your Stylus source you can import it via the JavaScript API as well:
return stylus(str)
.set('filename', path)
.set('compress', true)
.use(nib())
.import('nib');
Gradients
Nib’s gradient support is by far the largest feature it
provides, not only is the syntax extremely similar to what you would
normally write, it’s more forgiving, expands to vendor equivalents, and
can even produce a PNG for older browsers with node-canvas.
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);
}
Position mixins
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 lhdfs;
}
yielding:
#back-to-top {
position: fixed;
bottom: 10px;
right: lhdfs;
}
Clearfix
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;
}
Border radius
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: lhdfs;
}
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: lhdfs;
-moz-border-radius: lhdfs;
border-radius: lhdfs;
}
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;
}
Responsive
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;
}
}
Ellipsis
The overflow property is augmented with a “ellipsis” value, expanding to what you see below.
button {
overflow: ellipsis;
}
yielding:
button {
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
Reset
Nib comes bundled with psdhm’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()
Miscellaneous properties
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