/postcss-responsive-type

Automagical responsive typography, built on PostCSS

Primary LanguageJavaScript

PostCSS Responsive Type

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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

Contents

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;
}

MIT © Sean King