CSS 4.2.4参考手册
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简介更新历史关于样式表属性定位布局positionz-indextoprightbottomleftclipdisplayfloatclearvisibilityoverflowoverflow-xoverflow-y尺寸widthmin-widthmax-widthheightmin-heightmax-height外补白marginmargin-topmargin-rightmargin-bottommargin-left内补白paddingpadding-toppadding-rightpadding-bottompadding-left边框borderborder-widthborder-styleborder-colorborder-topborder-top-widthborder-top-styleborder-top-colorborder-rightborder-right-widthborder-right-styleborder-right-colorborder-bottomborder-bottom-widthborder-bottom-styleborder-bottom-styleborder-bottom-colorborder-leftborder-left-widthborder-left-styleborder-left-colorborder-radiusborder-top-left-radiusborder-top-right-radiusborder-bottom-right-radiusborder-bottom-left-radiusbox-shadowborder-imageborder-image-sourceborder-image-sliceborder-image-widthborder-image-outsetborder-image-repeat背景backgroundbackground-colorbackground-imagebackground-repeatbackground-attachmentbackground-positionbackground-originbackground-clipbackground-size颜色coloropacity字体fontfont-stylefont-variantfont-weightfont-sizefont-familyfont-stretchfont-size-adjust文本text-transformwhite-spacetab-sizeword-breakword-wrapoverflow-wraptext-aligntext-align-lasttext-justifyword-spacingletter-spacingtext-indentvertical-alignline-heighttext-size-adjust文本装饰text-decorationtext-decoration-linetext-decoration-colortext-decoration-styletext-decoration-skiptext-underline-positiontext-shadow书写模式directionunicode-bidiwriting-mode列表list-stylelist-style-imagelist-style-positionlist-style-type表格table-layoutborder-collapseborder-spacingcaption-sideempty-cells内容contentcounter-incrementcounter-resetquotes用户界面appearancetext-overflowoutlineoutline-widthoutline-coloroutline-styleoutline-offsetnav-indexnav-upnav-rightnav-downnav-leftcursorzoombox-sizingresizeime-modeuser-selectpointer-events多列columnscolumn-widthcolumn-countcolumn-gapcolumn-rulecolumn-rule-widthcolumn-rule-stylecolumn-rule-colorcolumn-spancolumn-fillcolumn-break-beforecolumn-break-aftercolumn-break-inside伸缩盒（旧）box-orientbox-packbox-alignbox-flexbox-flex-groupbox-ordinal-groupbox-directionbox-lines伸缩盒(新)flexflex-growflex-shrinkflex-basisflex-flowflex-directionflex-wrapalign-contentalign-itemsalign-selfjustify-contentorder变换transformtransform-origintransform-styleperspectiveperspective-originbackface-visibility过渡transitiontransition-propertytransition-durationtransition-timing-functiontransition-delay动画animationanimation-nameanimation-durationanimation-timing-functionanimation-delayanimation-iteration-countanimation-directionanimation-play-stateanimation-fill-mode打印pagepage-break-beforepage-break-afterpage-break-inside媒体查询widthheightdevice-widthdevice-heightorientationaspect-ratiodevice-aspect-ratiocolorcolor-indexmonochromeresolutionscangridOnly IEscrollbar-3dlight-colorscrollbar-darkshadow-colorscrollbar-highlight-colorscrollbar-shadow-colorscrollbar-arrow-colorscrollbar-face-colorscrollbar-track-colorscrollbar-base-colorfilterbehaviorOnly 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:linkE:visitedE:hoverE:activeE:focusE:lang(fr)E:not(s)E:rootE:first-childE:last-childE:only-childE:nth-child(n)E:nth-last-child(n)E:first-of-typeE:last-of-typeE:only-of-typeE:nth-of-type(n)E:nth-last-of-type(n)E:emptyE:checkedE:enabledE:disabledE:target@page:first@page:left@page:right伪对象选择符E:first-letter/E::first-letterE:first-line/E::first-lineE:before/E::beforeE:after/E::afterE::placeholderE::selection语法与规则!important/*comment*/@import@charset@media@font-face@page@keyframes@supports取值与单位长度<length>emexchremvwvhvmaxvmincmmmqinptpcpx角度<angle>deggradradturn时间<time>sms频率<frequency>HzkHz布局<fraction><grid>frgr分辨率<resolution>dpidpcmdppx颜色<color>Color NameHEXRGBRGBAHSLHSLAtransparentcurrentColor文本inheritinitialunset<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

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本文档使用 php.cn手册 发布

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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