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font-kerning

The font-kerning CSS property sets the use of the kerning information stored in a font.

Kerning defines how letters are spaced. In well-kerned fonts, this feature makes character spacing more uniform and pleasant to read than it would otherwise be.

In the image below, for instance, the examples on the left do not use kerning, while the ones on the right do:

Example of font-kerning

Syntax

The font-kerning property is specified as one of the keyword values listed below.

Values

auto
The browser determines whether font kerning should be used or not. For example, some browsers will disable kerning on small fonts, since applying it could harm the readability of text.
normal
Font kerning information stored in the font must be applied.
none
Font kerning information stored in the font is disabled.

Formal definition

Initial value auto
Applies to all elements. It also applies to ::first-letter and ::first-line.
Inherited yes
Computed value as specified
Animation type discrete

Formal syntax

auto | normal | none

Examples

Enabling and disabling kerning

HTML

<div id="kern"></div>
<div id="nokern"></div>
<textarea id="input">AV T. ij</textarea>

CSS

div {
  font-size: 2rem;
  font-family: serif;
}

#nokern {
  font-kerning: none;
}

#kern {
  font-kerning: normal;
}

JavaScript

let input  = document.getElementById('input');
let kern   = document.getElementById('kern');
let nokern = document.getElementById('nokern');

input.addEventListener('keyup', function() {
  kern.textContent = input.value; /* Update content */
  nokern.textContent = input.value;
});

kern.textContent = input.value; /* Initialize content */
nokern.textContent = input.value;

Specifications

Specification Status Comment
CSS Fonts Module Level 3
The definition of 'font-kerning' in that specification.
Candidate Recommendation Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
font-kerning 33
33
29 — 33
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
79 32
32
24 — 34
Disabled
Disabled From version 24 until version 34 (exclusive): this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No 20
20
16 — 20
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
9
9
6
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
font-kerning 4.4.3
4.4.3
4.4 — 4.4.3
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
33
33
29 — 33
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
32
32
24 — 34
Disabled
Disabled From version 24 until version 34 (exclusive): this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
20
20
16 — 20
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
9
9
6
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
2.0
2.0
1.0 — 2.0
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/font-kerning