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1、<title><styletype=Htext/cssu>P{color:blue;Background-color:gray;}</style></head><body><p>第一次学css</p></body>—-、<html><head><title><title><styletype=Mtext/cssn>p.red{coloured;}</sty!e></head><body>Vhl>类别选择符演示</hl><pclass="red">这是第一个段落</P><pclass=nre</p><p>2、dn>这是第二个段落</P>vp>这是第一个段落</P></body></html>—-、P{color:re;}PropertyValueColor(Property)：属性Red(Value)：值1.嵌入式样式表字体颜色字体加粗段落背景颜色字体加粗：<styletype-ntext/cssn>p{coloured;Font-weight:blod;background-color:blue;)</style>2.链接式样式表<head><linkhref=Hmain.cssHrel=nStykesheetn><head>Link：链接href：属性mai</p><p>3、n.css：层叠样式表的路径rel=:"Stykesheet"：风格样式表3.引入式样式表<styletype=utext/cssn>@importurl(main.css);4.类别选择符(选择一个类别)1.<styletype=Mtext/cssH>P.bold{font-weight:bold}</style></head><body><pclass=,,boldH>文字内容应该是粗体</p></body>2.Bright{texr-align:right}P.center{text-align:center}<body><pcIass=HrightH</p><p>4、>文字应该是向右对齐的v/p〉vpclass二"center”〉文字应该是居中对齐</p></body>1..center{text-align:center}这样的类可以被应用到任何元素上<hlclass="cenler">这个标题是居中排列的v/hl><pclass=ncenterM>这个段落是居中排列的v/p>备注：hl、p都跟随center类别选择符5.ID选择符（选择一个）ID（唯一）选择符是只用在一个元素上，<styletype="text/cssn>P#bold{font-weight:bold;}p#bold：选择一个ID是bold的元素</</p><p>5、style><body><pid=uboldu>文字内容应该是粗体v/p></body>6.Hl是1号字体<styletype=utext/cssM>hl#red{color:red;}</style><body><hlid=Mredn>内容文字应该是红色</hl></body>Hl,h2,h3,h4,h5,h6{color：green}每个标题元素的文字都是绿色。P,table{font-size:9pt}段落和表格里的文字尺寸为9号字效果等于=p{font-size:9pt}Table{font-size:9pt}7.群选择符<styletype="te</p><p>6、xt/css"><!-P，hl,{Text-align:legt;left:左对齐right:右对齐->}</style></head><body>vhl>群选择符演示v/hl><pid=uredH>这是第一个段落v/p><pclass=nbluen>这是第二个段落v/p><p>这是第三个段落Vp></body></html>&属性1.P{font-family:"sansserif}2.P{text-align:center;color:red}3.p{text-align:center;Color:black;font-family:arial}定义段落</p><p>7、字体为sansserif段落居中排列，段落中的文字为红色段落居中排列段落中的文字为黑色字体是arial9.样式表的层叠性div{color:red;font-size:9pt}<div><P>这个段落的文字为红色9号字</p></div>不同选择符定义相同的元素时，因为ID选择符是最后加上元素上的，所以优先级最高，其次是类选择符。如果想超越这三者之间的关系，可以用！Important提升样式表的优先权。例如：p{color:#FF0000!important}.blue{coIor:#0000FF}#idl{color:#fFFFF00}这三种样式中，最后依</p><p>8、照被!important申请的标记选择为红色文字，如</p> </div>
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