<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<style type="text/css">
.wrap {
width: 500px;
height: 500px;
margin: 0 auto;
border: 1px solid blue;
}
.con {
width: 80%;
height: 100px;
margin: 40px auto;
border: 1px solid black;
}
/*必须在父级hover，兼容：IE6+*/
.one:hover p {
color: red;
}
/*标签内要加data-title属性，兼容：IE9+*/
.two:hover::before {
content: attr(data-title);/*取到data-title属性的值*/
color: green;
}
.three:hover::after {
content: attr(data-title);/*取到data-title属性的值*/
color: blue;
}
</style>
<body>
<p>
<p class="con one">
<span>鼠标移进来</span>
<p>颜色会变哦</p>
</p>
<p class="con two" data-title="看我七十二变">
<span>鼠标移进来</span>
<p>文字会变哦</p>
</p>
<p class="con three" data-title="看我七十二变">
<span>鼠标移进来</span>
<p>文字会变哦</p>
</p>
</p>
</body>
</html>
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