字体 | font (Fonts) – CSS 中文开发手册
字体 | font (Fonts) - CSS 中文开发手册
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 font-variant: normal font-weight: normal font-stretch: normal font-size: medium line-height: normal font-family: depends on user agent
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line-height:指的是元素本身的字体大小
Media visual [Computed value](computed_value) as each of the properties of the shorthand:
font-style: 作为指定font-variant: 作为指定font-weight:指定的关键字或数值,bolder并lighter转换为实际值font-stretch: 作为指定font-size:按照规定,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,否则如指定font-family: 作为指定
动画类型作为速记的每个属性:
font-style:离散font-variant:离散font-weight:一个字体的重量 font-stretch:一种字体拉伸 font-size:一个长度 line-height:数量或长度font-family: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: <font-size><font-family>它可以选择包含以下值: <font-style><font-variant><font-weight><line-height>font-style,font-variant并且font-weight必须在之前font-size font-variant只能指定在CSS 2.1中定义的值,即normal和small-caps line-height必须紧跟font-size在“/”前面,如下所示:“ 16px/3”font-family 必须是指定的最后一个值。
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="https://cdn.breakyizhan.com/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) |
? |
? |
? |