HTML optgroup label 属性-在线运行代码案例-大卫编程网

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<!DOCTYPE html>
<html>
<head>
<title>HTML:<optgroup> label 属性 - 大卫编程网(div.cn)</title>
</head>
<body>
<select>
  <optgroup label="German Cars" disabled>
    <option value="mercedes">Mercedes</option>
    <option value="audi">Audi</option>
  </optgroup>
</select>
</body>
</html>