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font-feature-settings

font-feature-settings 属性用于控制OpenType字体中的高级印刷功能。

语法

/* 默认设置 */
font-feature-settings: normal;

/* 设置 OpenType 功能标签的值 */
font-feature-settings: "smcp";
font-feature-settings: "smcp" on;
font-feature-settings: "swsh" 2;
font-feature-settings: "smcp", "swsh" 2;

/* 全局值 */
font-feature-settings: inherit;
font-feature-settings: initial;
font-feature-settings: unset;
Note: Web开发者应该尽可能的使用类似 font-variant 这样的短标记属性或者相关的速记标识属性等, 类似 font-variant-ligatures, font-variant-caps, font-variant-east-asian (en-US), font-variant-alternates, font-variant-numeric or font-variant-position.

该属性是一个比较偏底层的功能接口，用于解决由于没有其他方法去访问和设置OpenType字体某些特性而无法解决一些特殊功能需求.

特别需要注意的是，该CSS属性不应该用来开启大写字母转换.

初始值normal
适用元素all elements. It also applies to ::first-letter and ::first-line.
是否是继承属性yes
计算值as specified
Animation typediscrete

值

normal
文本使用默认设置进行布局。
<feature-tag-value>
在呈现文本时，OpenType要素标记值的列表被传递到文本布局引擎以启用或禁用字体特征。标签始终是4个ASCII字符的 <string> 。如果是U + 20 - U + 7E代码点范围以外的字符或字符个数不对，则整个属性无效。 
值是一个正整数。两个关键字on和off分别是1和0的同义词。如果未设置任何值，则默认值为1。对于非布尔型OpenType功能（例如，文体替代 stylistic alternates），该值意味着要选择特定的字形；对于布尔值，它是一个开关。

形式语法

normal | <feature-tag-value>#
where 
<feature-tag-value> = <string> [ <integer> | on | off ]?

实例

/* use small-cap alternate glyphs */
.smallcaps { font-feature-settings: "smcp" on; }

/* convert both upper and lowercase to small caps (affects punctuation also) */
.allsmallcaps { font-feature-settings: "c2sc", "smcp"; }

/* enable historical forms */
.hist { font-feature-settings: "hist"; }

/* disable common ligatures, usually on by default */
.noligs { font-feature-settings: "liga" 0; }

/* enable tabular (monospaced) figures */
td.tabular { font-feature-settings: "tnum"; }

/* enable automatic fractions */
.fractions { font-feature-settings: "frac"; }

/* use the second available swash character */
.swash { font-feature-settings: "swsh" 2; }

/* enable stylistic set 7 */
.fancystyle {
  font-family: Gabriola; /* available on Windows 7, and on Mac OS */
  font-feature-settings: "ss07";
}

规范

Specification Status Comment
CSS Fonts Module Level 3
font-feature-settings		 Recommendation Initial definition

浏览器兼容性

BCD tables only load in the browser

其他参考