postcss responsive type

Automagical responsive typography, built on PostCSS

372

JavaScript

PostCSS Responsive Type

Generate automagical fluid typography, with new responsive properties for font-size, line-height, and letter-spacing. Built on PostCSS.

Responsive Type Demo

Inspired by this post.

Part of Rucksack - CSS Superpowers

Usage
Defaults
Browser Support

Usage

Quick start

html {
  font-size: responsive;
}

Pro tip: set a reaponsive font-size on html and use rem units throughout your project to make your whole UI fluid

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; /* min-size, max-size */
  font-range: 420px 1280px; /* viewport widths between which font-size is fluid */
}

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;

  /* or extended syntax: */
  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;

  /* or extended syntax: */
  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`

min-line-height: 1.2em
max-line-height: 1.8em
lower-line-height-range: 420px
upper-line-height-range: 1280px

`letter-spacing`

min-letter-spacing: 0px
max-letter-spacing: 4px
lower-letter-spacing-range: 420px
upper-letter-spacing-range: 1280px

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;
}