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  1.外部样式表:
 
  <head>
 
  <link rel="stylesheet" type="text/css" href="a.css" />
 
  </head>
 
  2.内部样式表:
 
  <head>
 
  <style type="text/css">
 
  ……
 
  </style>
 
  </head>
 
  3.内联表
 
  <p style="color:red;margin:0"></p>
 
  css语法由3部分构成:select {property: value}
 
  如果值为多个单词,则要给值加引号:p {font-family: "sans serif";}
 
  多重声明:p {text-align: center; color:red;}
 
  选择器分组:h1, h2, h3, h4, h5, h6 {color: green;}
 
  继承:body {font-family: Verdana, sans-serif;}所有子元素都从body继承属性
 
  a.css第一行:@charset "utf-8";
 
  派生选择器:li strong {…}用于选择元素<li><strong>…</strong></li>
 
  id选择器:#id1 {…}
 
  类选择器:。class1 {…}
 
  背景色:background-color:gray;
 
  背景图像:background-image:url(/ab/cd/e.gif);
 
  背景重复:background-repeat:repeat-x|repeat-y|no-repeat;
 
  背景定位:background-position:center|top|bottom|right|left|50% 50%|100px 200px;
 
  背景关联:background-attachment:scroll|fixed|inherit;
 
  内边距:padding, padding-top, padding-right, padding-bottom, padding-left
 
  边框:border, border-top, border-right, border-bottom, border-left, …
 
  外边距:margin, margin-top, margin-right, margin-bottom, margin-left
 
  position: static, relative, absolute, fixed
 
  float: left, right
 
  a:link {…}
 
  a:visited {…}
 
  a:hover {…}
 
  a:active {…}
 
  LVHA顺序定义

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