目录 搜索
简介 更新历史 关于样式表 属性 定位 布局 position z-index top right bottom left clip display float clear visibility overflow overflow-x overflow-y 尺寸 width min-width max-width height min-height max-height 外补白 margin margin-top margin-right margin-bottom margin-left 内补白 padding padding-top padding-right padding-bottom padding-left 边框 border border-width border-style border-color border-top border-top-width border-top-style border-top-color border-right border-right-width border-right-style border-right-color border-bottom border-bottom-width border-bottom-style border-bottom-style border-bottom-color border-left border-left-width border-left-style border-left-color border-radius border-top-left-radius border-top-right-radius border-bottom-right-radius border-bottom-left-radius box-shadow border-image border-image-source border-image-slice border-image-width border-image-outset border-image-repeat 背景 background background-color background-image background-repeat background-attachment background-position background-origin background-clip background-size 颜色 color opacity 字体 font font-style font-variant font-weight font-size font-family font-stretch font-size-adjust 文本 text-transform white-space tab-size word-break word-wrap overflow-wrap text-align text-align-last text-justify word-spacing letter-spacing text-indent vertical-align line-height text-size-adjust 文本装饰 text-decoration text-decoration-line text-decoration-color text-decoration-style text-decoration-skip text-underline-position text-shadow 书写模式 direction unicode-bidi writing-mode 列表 list-style list-style-image list-style-position list-style-type 表格 table-layout border-collapse border-spacing caption-side empty-cells 内容 content counter-increment counter-reset quotes 用户界面 appearance text-overflow outline outline-width outline-color outline-style outline-offset nav-index nav-up nav-right nav-down nav-left cursor zoom box-sizing resize ime-mode user-select pointer-events 多列 columns column-width column-count column-gap column-rule column-rule-width column-rule-style column-rule-color column-span column-fill column-break-before column-break-after column-break-inside 伸缩盒(旧) box-orient box-pack box-align box-flex box-flex-group box-ordinal-group box-direction box-lines 伸缩盒(新) flex flex-grow flex-shrink flex-basis flex-flow flex-direction flex-wrap align-content align-items align-self justify-content order 变换 transform transform-origin transform-style perspective perspective-origin backface-visibility 过渡 transition transition-property transition-duration transition-timing-function transition-delay 动画 animation animation-name animation-duration animation-timing-function animation-delay animation-iteration-count animation-direction animation-play-state animation-fill-mode 打印 page page-break-before page-break-after page-break-inside 媒体查询 width height device-width device-height orientation aspect-ratio device-aspect-ratio color color-index monochrome resolution scan grid Only IE scrollbar-3dlight-color scrollbar-darkshadow-color scrollbar-highlight-color scrollbar-shadow-color scrollbar-arrow-color scrollbar-face-color scrollbar-track-color scrollbar-base-color filter behavior Only webkit -webkit-text-fill-color -webkit-text-stroke -webkit-text-stroke-width -webkit-text-stroke-color -webkit-box-reflect -webkit-tap-highlight-color -webkit-user-drag -webkit-overflow-scrolling 选择符 元素选择符 通配选择符(*) 类型选择符(E) ID选择符(E#id) 类选择符(E.class) 关系选择符 包含选择符(E F) 子选择符(E>F) 相邻选择符(E+F) 兄弟选择符(E~F) 属性选择符 E[att] E[att="val"] E[att~="val"] E[att^="val"] E[att$="val"] E[att*="val"] E[att|="val"] 伪类选择符 E:link E:visited E:hover E:active E:focus E:lang(fr) E:not(s) E:root E:first-child E:last-child E:only-child E:nth-child(n) E:nth-last-child(n) E:first-of-type E:last-of-type E:only-of-type E:nth-of-type(n) E:nth-last-of-type(n) E:empty E:checked E:enabled E:disabled E:target @page:first @page:left @page:right 伪对象选择符 E:first-letter/E::first-letter E:first-line/E::first-line E:before/E::before E:after/E::after E::placeholder E::selection 语法与规则 !important /*comment*/ @import @charset @media @font-face @page @keyframes @supports 取值与单位 长度 <length> em ex ch rem vw vh vmax vmin cm mm q in pt pc px 角度 <angle> deg grad rad turn 时间 <time> s ms 频率 <frequency> Hz kHz 布局 <fraction> <grid> fr gr 分辨率 <resolution> dpi dpcm dppx 颜色 <color> Color Name HEX RGB RGBA HSL HSLA transparent currentColor 文本 inherit initial unset <string> <url> <identifier> 函数 calc() toggle() 生成内容 counter() counters() attr() 图像 <image> image() image-set() <gradient> linear-gradient() radial-gradient() repeating-linear-gradient() repeating-radial-gradient() 数字 <number> <integer> <percentage> 附录 颜色关键字 媒体类型 CSS Hack 条件Hack 属性级Hack 选择符级Hack 问题和经验 Bugs和解决方案 技巧和经验 其它经验
文字

语法:

font-size:<absolute-size> | <relative-size> | <length> | <percentage>

<absolute-size> = xx-small | x-small | small | medium | large | x-large | xx-large

<relative-size> = smaller | larger

默认值medium

适用于:所有元素

继承性:有

动画性:是

计算值:指定值

取值:

  • <absolute-size>:根据对象字号进行调节。以 medium 作为基础参照,xx-small相当于medium 3/5 (h6),x-small: 3/4,small: 8/9 (h5),medium: 1 (h4),large: 6/5 (h3),x-large: 3/2 (h2),xx-large: 2/1 (h1),

  • <relative-size>:相对于父对像中字号进行相对调节。使用成比例的em单位计算。

  • <length>:用长度值指定文字大小。不允许负值。

  • <percentage>:用百分比指定文字大小。其百分比取值是基于父对象中字体的尺寸。不允许负值。

说明:

设置或检索对象中的字体尺寸。
  • 对应的脚本特性为fontSize

兼容性:

ValuesIEFirefoxChromeSafariOperaiOS SafariAndroid BrowserAndroid Chrome
Basic Support6.0+2.0+4.0+3.1+3.5+3.2+2.1+18.0+

示例:

实例

<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>font-size_CSS参考手册_web前端开发参考手册系列</title>
<meta name="author" content="Joy Du(飘零雾雨), dooyoe@gmail.com, www.doyoe.com" />
<style>
.test p{margin:15px 0;border:1px solid #000;}
.xx-small p{font-size:xx-small;}
.x-small p{font-size:x-small;}
.small p{font-size:small;}
.medium p{font-size:medium;}
.large p{font-size:large;}
.x-large p{font-size:x-large;}
.xx-large p{font-size:xx-large;}
.smaller p{font-size:smaller;}
.larger p{font-size:larger;}
.float p{font-size:20px;}
.percentage{font-size:20px;}
.percentage span{font-size:60%;}
</style>
</head>
<body>
<ul class="test">
	<li class="xx-small">
		<strong>尺寸大小为xx-small:</strong>
		<p>xx-small尺寸的文字。</p>
	</li>
	<li class="x-small">
		<strong>尺寸大小为x-small:</strong>
		<p>x-small尺寸的文字。</p>
	</li>
	<li class="small">
		<strong>尺寸大小为small:</strong>
		<p>small尺寸的文字。</p>
	</li>
	<li class="medium">
		<strong>尺寸大小为medium:</strong>
		<p>medium尺寸的文字。</p>
	</li>
	<li class="large">
		<strong>尺寸大小为large:</strong>
		<p>large尺寸的文字。</p>
	</li>
	<li class="x-large">
		<strong>尺寸大小为x-large:</strong>
		<p>x-large尺寸的文字。</p>
	</li>
	<li class="xx-large">
		<strong>尺寸大小为xx-large:</strong>
		<p>xx-large尺寸的文字。</p>
	</li>
	<li class="samller">
		<strong>尺寸大小为samller:</strong>
		<p>samller尺寸的文字。</p>
	</li>
	<li class="larger">
		<strong>尺寸大小为larger:</strong>
		<p>larger尺寸的文字。</p>
	</li>
	<li class="float">
		<strong>尺寸大小为20px:</strong>
		<p>20px尺寸的文字。</p>
	</li>
	<li class="percentage">
		<strong>尺寸大小为20px:</strong>
		<p>父对象20px尺寸的文字。<span>我的尺寸只是父对象的60%</span></p>
	</li>
</ul>
</body>
</html>
			

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