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4.24 CSS选择器优先级和盒子
阿超的博客
Original
704 people have browsed it

一、CSS的选择器优先级

实例

<html>
	<head>
		<meta charset="utf-8">
		<title>CSS选择器和优先级</title>
		<style>
        /* 标签选择器 */
        h1 {
			background-color:  #87CEEB;
			color:  #FF0000;

        }
        /* class类选择器 用的是 .  开头。优先级大于标签选择器 */
        .bg-blue {
            background-color:  #F5DEB3;
        }
        /* id选择器 ,用#开头命名。 优先级大于class选择器 */
        #bg-yellow {
            background-color: yellow;
        }
		</style>
	</head>
	<body>
	<h1>我是H1体验-标签</h1>
	<h1 class="bg-blue">我是H1体验classs</h1>
	<h1 class="bg-blue" id="bg-yellow">我是H1体验id</h1>
	<h1 class="bg-blue" id="bg-yellow" style="background-color: green;">我是H1体验-元素属性style</h1>
	</body>
</html>

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二、盒子模型,体会padding/border简写规则

实例

<html>
	<head>
		<meta charset="utf-8">
		<title>盒子模型</title>
		<style>
        .box1 {
			width: 300px;
			height: 300px;
			background-color: green;
        }
        .box2 {
			height:inherit;
            background-color: yellow;
			padding 50px solid green;
			border:50px solid red; 
        }
  
		</style>
	</head>
	<body>
      <div class="box1">
		  <div class="box2">
			  <div align=center>我是小盒子</div>
		  </div>
	  </div>
	</body>
</html>

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