<!DOCTYPE html>
<html>
<head>
<title>Заголовок окна веб-страницы</title>
</head>
<body>
<select>
<optgroup disabled="disabled" label="Quizzes">
<option value="html">HTML</option>
<option value="css">CSS</option>
<option value="javascript">JavaScript</option>
<option value="php">PHP</option>
</optgroup>
<optgroup label="Snippets">
<option value="git">Git</option>
<option value="angularjs">AngularJS</option>
</optgroup>
</select>
</body>
</html>