font

font 属性可以用来作为 font-style, font-variant, font-weight, font-size, line-height 和 font-family 属性的简写，或将元素的字体设置为系统字体。

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

与任何简写属性一样，任何未指定的值都将设置为其对应的初始值（可能覆盖先前使用非简写属性设置的值）。 虽然不能通过 font 直接设置，但是font-stretch，font-size-adjust 和 font-kerning 也会重置为初始值。

可以将font属性指定为单个关键字，它将选择系统字体，或者作为字体相关的属性的简写。

如果将 font 指定为系统关键字，则它必须是以下之一：caption, icon, menu, message-box, small-caption, status-bar。

如果 font 字体相关的属性的简写：

• 必须包含以下值：
  • <font-size>
  • <font-family>
• 可以选择性包含以下值：
  • <font-style>
  • <font-variant>
  • <font-weight>
  • <line-height>
• font-style, font-variant 和 font-weight 必须在 font-size 之前
• 在 CSS 2.1 中 font-variant 只可以是 normal 和 small-caps
• line-height 必须跟在 font-size 后面，由 "/" 分隔，例如 "16px/3"
• font-family 必须最后指定

<'font-style'>

见 font-style 属性。

<'font-variant'>

见 font-variant 属性。

<'font-weight'>

见 font-weight 属性。

<'font-size'>

见 font-size 属性。

<'line-height'>

见 line-height 属性。

<'font-family'>

见 font-family 属性。

系统字体

caption

用于标题控件（如按钮，下拉列表等）的系统字体。

icon

用于标签图标的系统字体。

menu

菜单中（如下拉菜单和菜单列表）使用的系统字体。

message-box

用于对话框的系统字体。

small-caption

用于小标题控件的系统字体。

status-bar

用于窗口状态栏的系统字体。

系统关键字前缀

浏览器经常会多实现几个带前缀的关键字；Gecko 实现了 -moz-window, -moz-document, -moz-desktop, -moz-info, -moz-dialog, -moz-button, -moz-pull-down-menu, -moz-list, 和 -moz-field.

正式语法

[ [ <'font-style'> || <font-variant-css21> || <'font-weight'> || <'font-stretch'> ]? <'font-size'> [ / <'line-height'> ]? <'font-family'> ] | caption | icon | menu | message-box | small-caption | status-bar
where 
<font-variant-css21> = [ normal | small-caps ]

/* 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 }

HTML Content

    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>         <div class="setPropCont">             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>         </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>

CSS Content

body, input {
  font: 14px arial;
}

.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;
}

JavaScript Content

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();