字体 | font
字体
fontCSS属性是用于设定缩写属性font-style，font-variant，font-weight，font-size，line-height，和font-family；或者使用特定的关键字将元素的字体设置为系统字体。
/* size | family */
font: 2em "Open Sans", sans-serif;
/* style | size | family */
font: italic 2em "Open Sans", sans-serif;
/* style | variant | weight | size/line-height | family */
font: italic small-caps bolder 16px/3 cursive;
/* style | variant | weight | stretch | size/line-height | family */
font: italic small-caps bolder condensed 16px/3 cursive;
/* The font used in system dialogs */
font: message-box;
font: icon;
/* Global values */
font: inherit;
font: initial;
font: unset;
与任何速记属性一样，任何未指定的单个值都将设置为其相应的初始值（可能会覆盖先前使用非速记属性设置的值）。虽然没有直接设定由font，所述longhands font-stretch，font-size-adjust和font-kerning也复位到它们的初始值。
| 初始值 | 作为速记的每个属性：font-style：normal font-variant：normal font-weight：normal font-stretch：normal font-size：medium line-height：normal font-family：depends on user agent |
|---|---|
| 适用于 | 所有元素。它也适用于:: first-letter和:: first-line。 |
| 遗传 | 是 |
| 百分比 | 作为简写的每个属性：font-size：引用父元素的字体大小line-height：引用元素本身的字体大小 |
| 媒体 | 视觉 |
| 计算值 | 作为速记的每个属性：font-style：如指定的font-variant：指定的font-weight：指定的关键字或数值，用大胆和轻量级转换为实际值font-stretch：指定字体-size：如指定，但相对长度转换为绝对长度line-height：对于百分比和长度值，绝对长度，否则为指定font-family：按指定 |
| 动画类型 | 作为速记的每个属性：font-style：discrete font-variant：discrete font-weight：字体重量font-stretch：字体stretch字体大小：长度line-height：数字或长度font-family ：离散 |
| 规范的顺序 | 出现在价值形式语法中的顺序 |
font-style:normal
Applies to all elements. It also applies to [`::first-letter`](::first-letter) and [`::first-line`](::first-line). [Inherited](inheritance) yes Percentages as each of the properties of the shorthand:
font-size：引用父元素的字体大小
Media visual [Computed value](computed_value) as each of the properties of the shorthand:
font-style： 作为指定
动画类型作为速记的每个属性：
font-style：离散
Canonical order order of appearance in the formal grammar of the values
句法
font属性可以被指定为单个关键字，其将选择系统字体，或者作为各种字体相关属性的简写。
如果font被指定为一个系统的关键字，它必须是以下之一：caption，icon，menu，message-box，small-caption，status-bar。
如果font被指定为多个与字体相关的属性的简写，则：
- 它必须包含以下值：
值
<'font-style'>查看font-styleCSS属性。<'font-variant'>查看font-variantCSS属性。<'font-weight'>查看font-weightCSS属性。<'font-stretch'>查看font-stretchCSS属性。<'font-size'>查看font-sizeCSS属性。<'line-height'>查看line-heightCSS属性。<'font-family'>查看font-familyCSS属性。caption用于字幕控制的系统字体（例如按钮，下拉菜单等）。icon用于标记图标的系统字体。menu菜单中使用的系统字体（例如，下拉菜单和菜单列表）。message-box对话框中使用的系统字体。small-caption用于标记小控件的系统字体。status-bar在窗口状态bars.Prefixed系统字体keywordsBrowsers使用的系统字体通常实现几个，前缀，关键字：壁虎工具-moz-window，-moz-document，-moz-desktop，-moz-info，-moz-dialog，-moz-button，-moz-pull-down-menu，-moz-list，和-moz-field。
形式语法
[ [ <'font-style'> || <font-variant-css21> || <'font-weight'> || <'font-stretch'> ]? <'font-size'> [ / <'line-height'> ]? <'font-family'> ] | caption | icon | menu | message-box | small-caption | status-barwhere <font-variant-css21> = [ normal | small-caps ]
示例
/* Set the font size to 12px and the line height to 14px.
Set the font family to sans-serif */
p { font: 12px/14px sans-serif }
/* Set the font size to 80% of the parent element
or default value (if no parent element present).
Set the font family to sans-serif */
p { font: 80% sans-serif }
/* Set the font weight to bold,
the font-style to italic,
the font size to large,
and the font family to serif. */
p { font: bold italic large serif }
/* Use the same font as the status bar of the window */
p { font: status-bar }
Live sample
HTML内容
<p>
Change the radio buttons below to see the generated shorthand and it's effect.
</p>
<form action="createShortHand()">
<div class="cf">
<div class="setPropCont">
font-style<br/>
<input type="radio" id="font-style-none" name="font_style" checked="" value="" onchange="setCss()"> <label for="font-style-none">none</label><br/>
<input type="radio" id="font-style-normal" name="font_style" value="normal" onchange="setCss()"> <label for="font-style-normal">normal</label><br/>
<input type="radio" id="font-style-italic" name="font_style" value="italic" onchange="setCss()"> <label for="font-style-italic">italic</label><br/>
<input type="radio" id="font-style-oblique" name="font_style" value="oblique" onchange="setCss()"> <label for="font-style-oblique">oblique</label>
</div>
<div class="setPropCont">
font-variant<br>
<input type="radio" id="font-variant-none" name="font_variant" checked="" value=" " onchange="setCss()"> <label for="font-variant-none">none</label><br/>
<input type="radio" id="font-variant-normal" name="font_variant" value="normal" onchange="setCss()"> <label for="font-variant-normal">normal</label><br/>
<input type="radio" id="font-variant-small-caps" name="font_variant" value="small-caps" onchange="setCss()"> <label for="font-variant-small-caps">small-caps</label>
</div>
<div class="setPropCont">
font-weight<br/>
<input type="radio" id="font-weight-none" name="font_weight" value="" onchange="setCss()"> <label for="font-weight-none">none</label><br/>
<input type="radio" id="font-weight-normal" checked="" name="font_weight" value="400" onchange="setCss()"> <label for="font-weight-normal">normal</label><br/>
<input type="radio" id="font-weight-bold" name="font_weight" value="700" onchange="setCss()"> <label for="font-weight-bold">bold</label>
</div>
<div class="setPropCont">
font-size<br/>
<input type="radio" id="font-size-12px" name="font_size" value="12px" onchange="setCss()"> <label for="font-size-12px">12px</label><br/>
<input type="radio" id="font-size-16px" name="font_size" value="16px" checked="" onchange="setCss()"> <label for="font-size-16px">16px</label><br/>
<input type="radio" id="font-size-24px" name="font_size" value="24px" onchange="setCss()"> <label for="font-size-24px">24px</label>
</div>
<div class="setPropCont">
line-height<br/>
<input type="radio" id="line-height-none" name="line_height" checked="" value="" onchange="setCss()"> <label for="line-height-none">none</label><br/>
<input type="radio" id="line-height-1.2" name="line_height" value="/1.2" onchange="setCss()"> <label for="line-height-1.2">1.2</label><br/>
<input type="radio" id="line-height-3" name="line_height" value="/3" onchange="setCss()"> <label for="line-height-3">3</label>
</div><br/>
<div class="setPropCont fontfamily">
font-family<br/>
<input type="radio" id="font-family-courier" name="font_family" checked="" value="courier" onchange="setCss(5,'courier')"> <label for="font-family-courier">courier</label><br/> <input type="radio" id="font-family-serif" name="font_family" value="serif" onchange="setCss()"> <label for="font-family-serif">serif</label><br />
<input type="radio" id="font-family-sans-serif" name="font_family" value="sans-serif" onchange="setCss()"> <label for="font-family-sans-serif">sans-serif</label><br /> <input type="radio" id="font-family-arial" name="font_family" value="arial" onchange="setCss()"> <label for="font-family-arial">Arial</label><br />
<input type="radio" id="font-family-monospace" name="font_family" value="monospace" onchange="setCss()"> <label for="font-family-monospace">monospace</label><br /> <input type="radio" id="font-family-cursive" name="font_family" value="cursive" onchange="setCss()"> <label for="font-family-cursive">cursive</label><br />
<input type="radio" id="font-family-fantasy" name="font_family" value="fantasy" onchange="setCss()"> <label for="font-family-fantasy">fantasy</label><br /> <input type="radio" id="font-family-system-ui" name="font_family" value="system-ui" onchange="setCss()"> <label for="font-family-system-ui">system-ui</label><br />
</div>
</div>
<div class="cf propInputs">
<div class="propInputCont tar">
font :
</div>
<div class="propInputCont">
<input type="text" class="curCss" id="input_font_style"><br/>
font-style <br/>
optional
</div>
<div class="propInputCont">
<input type="text" class="curCss" id="input_font_variant"> <br/>
font-variant <br/>
optional
</div>
<div class="propInputCont">
<input type="text" class="curCss" id="input_font_weight"> <br/>
font-weight <br/>
optional
</div>
<div class="propInputCont">
<input type="text" class="curCss mandatory" id="input_font_size"> <br/>
font-size <br/>
mandatory
</div>
<div class="propInputCont">
<input type="text" class="curCss" id="input_line_height"> <br/>
line-height <br/>
optional
</div>
<div class="propInputCont">
<input type="text" class="curCss mandatory" id="input_font_family"> <br/>
font-family <br/>
mandatory
</div>
</div>
</form>
<div class="fontShortHand">
This is some sample text.
</div>
<br/><br/><br/><br/><br/><br/>
CSS内容
body, input {
font: 14px arial;
overflow: hidden;
}
.propInputCont {
float: left;
text-align: center;
margin-right: 5px;
width: 80px;
}
.setPropCont {
float: left;
margin-right: 5px;
width: 120px;
}
.propInputs, .setPropCont {
margin-bottom: 1em;
}
.curCss {
border: none;
border-bottom: 1px solid black;
text-align: center;
width: 80px;
}
.mandatory {
border-bottom-color: red;
}
.cf:before,
.cf:after {
content: " ";
display: table;
}
.cf:after {
clear: both;
}
.tar {
width: 40px;
text-align: right;
}
.fontfamily {
display: inline-block;
}
JavaScript内容
var textAreas = document.getElementsByClassName("curCss"),
shortText = "",
getCheckedValue,
setCss,
getProperties,
injectCss;
getProperties = function () {
shortText =
getCheckedValue("font_style") + " " +
getCheckedValue("font_variant") + " " +
getCheckedValue("font_weight") + " " +
getCheckedValue("font_size") +
getCheckedValue("line_height") + " " +
getCheckedValue("font_family"
return shortText;
}
getCheckedValue = function(radio_name) {
oRadio = document.forms[0].elements[radio_name];
for (var i = 0; i < oRadio.length; i++) {
if(oRadio[i].checked) {
var propInput = "input_" + radio_name,
curElemName = "input_" + radio_name,
curElem = document.getElementById(curElemName
curElem.value = oRadio[i].value;
return oRadio[i].value;
}
}
}
setCss = function () {
getProperties(
injectCss(shortText
}
injectCss = function(cssFragment) {
old = document.body.getElementsByTagName("style"
if (old.length > 1) {
old[1].parentElement.removeChild(old[1]
}
css = document.createElement("style"
css.innerHTML = ".fontShortHand{font: " + cssFragment + "}";
document.body.appendChild(css
}
setCss(
规范
| 规范 | 状态 | 评论 |
|---|---|---|
| CSS字体模块级别3该规范中'font'的定义。 | 候选推荐 | 增加了对字体拉伸值的支持。 |
| CSS级别2（修订1）该规范中'font-weight'的定义。 | 建议 | 新增对关键字的支持。 |
| CSS级别1该规范中'font'的定义。 | 建议 | 初始定义。 |
浏览器兼容性
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Shorthand | 1.0 | (Yes) | 1.0 (1.0) | 3.0 | 3.5 | 1.0 (85) |
| System fonts | 1.0 | (Yes) | 1.0 (1.0) | 4.0 | 6.0 | 1.0 (85) |
| Support of font-stretch values | (Yes) | ? | 43 (43) | ? | ? | ? |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | ? | ? | ? | ? |
| Support of font-stretch values | ? | ? | 43 (43) | ? | ? | ? |
