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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>类选择器</title>
<style>
:target {
background-color: red;
}
</style>
</head>
<body>
<a href="#a1">menu 1</a>
<a href="#a2">menu 2</a>
<a href="#a3">menu 3</a>
<a href="#a4">menu 4</a>
<div id="a1">
<h1>menu 1</h1>
<p> paragraph 1</p>
</div>
<div id="a2">
<h1>menu 2</h1>
<p> paragraph 2</p>
<div id="a3">
<h1>menu 3</h1>
<p> paragraph 3</p>
<div id="a4">
<h1>menu 4</h1>
<p> paragraph 4</p>
</body>
</html>
输入 JavaScript 代码……
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输入 CSS 代码……