纯css折叠的菜单源代码如下:

<!DOCTYPE html>
<html>
< >http://www.manongjc.com/article/1274.html </ >
<head>
<style type=\'text/css\'>
nav a {
  display: block;
}
summary {
  cursor: pointer;
}
summary::-webkit-details-marker {
  display: none;
}
</style>
</head>
<body>
  <details>
    <summary>Heading #1</summary>
    <nav>
      <a href=\"#\">  A</a> <a href=\"#\">  B</a> <a href=\"#\">  C</a>
    </nav>
  </details>
</body>
</html>

在线运行

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