font-style - CSS（层叠样式表）编辑

font-style CSS 属性允许你选择 font-family 字体下的 italic 或 oblique 样式。

Italic 样式一般是指书写体，相比无样式的字体，通常会占用较少的高度，而 oblique 字形一般只是常规字形的倾斜版本。斜体（italic）和倾斜体（oblique）都是通过人工倾斜常规字体的字形来模拟的（使用 font-synthesis 对此进行控制）。

Italic font faces are generally cursive in nature, usually using less horizontal space than their unstyled counterparts, while oblique faces are usually just sloped versions of the regular face. When the specified style is not available, both italic and oblique faces are simulated by artificially sloping the glyphs of the regular face (use font-synthesis to control this behavior).

语法

font-style: normal;
font-style: italic;
font-style: oblique;
font-style: oblique 10deg;

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

font-style 属性被指定为从下面的取值列表中的单独一个关键字，如果关键字是 oblique，则可附加一个可选的角度。

值

normal: 选择 font-family 的常规字体。
italic: 选择斜体，如果当前字体没有可用的斜体版本，会选用倾斜体（oblique ）替代。
oblique: 选择倾斜体，如果当前字体没有可用的倾斜体版本，会选用斜体（italic ）替代。 If one or more oblique faces are available in the chosen font family, the one that most closely matches the specified angle is chosen. If no oblique faces are available, the browser will synthesize an oblique version of the font by slanting a normal face by the specified amount. Valid values are degree values of -90deg to 90deg inclusive. If an angle is not specified, an angle of 14 degrees is used. Positive values are slanted to the end of the line, while negative values are slanted towards the beginning.

In general, for a requested angle of 14 degrees or greater, larger angles are prefered; otherwise, smaller angles are preferred (see the spec's font matching section for the precise algorithm).

可变字体

可变字体（Variable font）可以精确控制 oblique 字体的倾斜程度。You can select this using the <angle> modifier for the oblique keyword.

For TrueType or OpenType variable fonts, the "slnt" variation is used to implement varying slant angles for oblique, and the "ital" variation with a value of 1 is used to implement italic values. See font-variation-settings.

For the example below to work, you'll need a browser that supports the CSS Fonts Level 4 syntax in which font-style: oblique can accept an <angle>.

HTML

<header>
    <input type="range" id="slant" name="slant" min="-90" max="90" />
    <label for="slant">Slant</label>
</header>
<div class="container">
    <p class="sample">...it would not be wonderful to meet a Megalosaurus, forty feet long or so, waddling like an elephantine lizard up Holborn Hill.</p>
</div>

CSS

/*
AmstelvarAlpha-VF 由 David Berlow 制作：https://github.com/TypeNetwork/Amstelvar
在此使用时，遵循此开源协议：
https://github.com/TypeNetwork/Amstelvar/blob/master/OFL.txt
*/

@font-face {
  src: url('https://mdn.mozillademos.org/files/16044/AmstelvarAlpha-VF.ttf');
  font-family:'AmstelvarAlpha';
  font-style: normal;
}

label {
  font: 1rem monospace;
}

.container {
  max-height: 150px;
  overflow: scroll;
}

.sample {
  font: 2rem 'AmstelvarAlpha', sans-serif;
}

html, body {
  max-height: 100vh;
  max-width: 100vw;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

header {
  margin-bottom: 1.5rem;
}

.container {
  flex-grow: 1;
}

.container > p {
  margin-top: 0;
  margin-bottom: 0;
}

JavaScript

let slantLabel = document.querySelector('label[for="slant"]');
let slantInput = document.querySelector('#slant');
let sampleText = document.querySelector('.sample');

function update() {
  let slant = `oblique ${slantInput.value}deg`;
  slantLabel.textContent = `font-style: ${slant};`;
  sampleText.style.fontStyle = slant;
}

slantInput.addEventListener('input', update);

update();

形式化语法

normal | italic | oblique <angle>?

示例

示例展示了不同的 font-style 值。CSS 看起来像这样：

<p class="normal">This paragraph is normal.</p>
<p class="italic">This paragraph is italic.</p>
<p class="oblique">This paragraph is oblique.</p>

.normal {
  font-style: normal;
}

.italic {
  font-style: italic;
}

.oblique {
  font-style: oblique;
}

请注意，不是所有的字体都有确切的 oblique 和 italic 字形，即便如此，浏览器也会通过使用现有的字形来模拟所缺少的字形。下面是一个使用这两种字形渲染字体的示例：

可访问性问题

Large sections of text set with a font-style value of italic may be difficult for people with cognitive concerns such as Dyslexia to read.

规范

规范	状态	注释
CSS Fonts Module Level 4 font-style	Working Draft	Adds the ability to specify an angle after `oblique`
CSS Fonts Module Level 3 font-style	Candidate Recommendation	没有变化
CSS Level 2 (Revision 1) font-style	Recommendation	没有变化
CSS Level 1 font-style	Recommendation	初始定义

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 type	discrete

浏览器兼容性

BCD tables only load in the browser

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

[1] 在 Firefox 44 之前，Gecko 并不对 oblique 和 italic 字形做出区分。在那之后，如果有可用的字形，它将使用正确的字形。

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