PostCSS Responsive Type

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

Inspired by this post.

Part of Rucksack - CSS Superpowers

Usage
Defaults
Browser Support

Usage

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; /* 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;
}

tennessine / postcss-responsive-type Goto Github PK