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font-kerning CSS 属性设置是否使用字体中储存的字距信息。

/* Keyword values */
font-kerning: auto;
font-kerning: normal;
font-kerning: none;

/* Global values */
font-kerning: inherit;
font-kerning: initial;
font-kerning: unset;

Kerning(字距)定义了字母的分布情况。对于良好地规定了字距的字体,字距特性使得字母分布更为统一,阅读体验更佳。如下图所示,左侧的示例没有应用字距,而右侧使用了:

Example of font-kerning

初始值auto
适用元素all elements. It also applies to ::first-letter and ::first-line.
是否是继承属性yes
适用媒体visual
计算值as specified
Animation typediscrete
正规顺序the unique non-ambiguous order defined by the formal grammar

语法

font-kerning 属性通过以下的关键字进行指定。

auto
浏览器来决定是否使用字体字距。比如,一些浏览器会在小字体的情况下禁用字距,因为这会使得文本可读性下降。
normal
必须应用字体中的字距信息。
none
禁用字体中的字距信息。

Formal syntax

auto | normal | none

示例

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

var input  = document.getElementById('input'),
    kern   = document.getElementById('kern'),
    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;

规格

规格 状态 注释
CSS Fonts Module Level 3
font-kerning
Candidate Recommendation Initial definition.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 32
Prefixed
Full support 32
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge No support NoFirefox Full support 32
Full support 32
No support 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.
IE No support NoOpera ? Safari Full support 7WebView Android ? Chrome Android ? Edge Mobile No support NoFirefox Android Full support 32
Full support 32
No support 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.
Opera Android ? Safari iOS Full support 7Samsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
User must explicitly enable this feature.
User must explicitly enable this feature.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

参考

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