PostCSS Responsive Type
PostCSS plugin for automagical responsive typography. Adds a responsive
property to font-size
, line-height
and letter-spacing
that generates complex calc
and vw
based font sizes.
Inspired by this post from @MikeRiethmuller, and Typographic.
Part of Rucksack - CSS Superpowers.
Quick start:
html {
font-size: responsive;
}
Specify parameters:
Units can be in px, rem, or em. When using em units, be sure that the font-range
is specified in em as well.
html {
font-size: responsive 12px 21px;
font-range: 420px 1280px;
}
Expanded syntax:
html {
font-size: responsive;
min-font-size: 12px;
max-font-size: 21px;
lower-font-range: 420px;
upper-font-range: 1280px;
}
Responsive line-height
and letter-spacing
:
PostCSS Responsive Type also allows you to set fluid sizes for the line-height
and letter-spacing
properties. They have the same syntax and work the same way as responsive font sizes.
html {
line-height: responsive 1.2em 1.8em;
line-height-range: 420px 1280px;
line-height: responsive;
min-line-height: 1.2em;
max-line-height: 1.8em;
lower-line-height-range: 420px;
upper-line-height-range: 1280px;
}
html {
letter-spacing: responsive 0px 4px;
letter-spacing-range: 420px 1280px;
letter-spacing: responsive;
min-letter-spacing: 0px;
max-letter-spacing: 4px;
lower-letter-spacing-range: 420px;
upper-letter-spacing-range: 1280px;
}
Note: Unitless line heights are not supported.
--
Defaults
To get started you only need to specify the responsive
property, all other values have sane defaults.
font-size
-
min-font-size
: 14px
-
max-font-size
: 21px
-
lower-font-range
: 420px
-
upper-font-range
: 1280px
line-height
letter-spacing
--
Browser Support
postcss-responsive-type
just uses calc, vw units, and media queries behind the scenes, so it works on all modern browsers (IE9+). Although Opera Mini is not supported.
Legacy browsers will ignore the output responsive
font-size. You can easily provide a simple static fallback:
.foo {
font-size: 16px;
font-size: responsive;
}
Alternatively, if you feel the need to fully support legacy browsers or Opera Mini, there are polyfills that can help!
--
Usage
postcss([ require('postcss-responsive-type')() ])
See PostCSS docs for examples for your environment.
You can use postcss-responsive-type
with Stylus through PostStylus.
--
License
MIT © Sean King