<!DOCTYPE html>
<html>
<head>
<title>Window title of the page</title>
</head>
<body>
<select aria-label="Books nad Snippets">
<optgroup label="Books">
<option value="html">HTML</option>
<option value="css">CSS</option>
</optgroup>
<optgroup label="Snippets">
<option value="git">Git</option>
<option value="java">Java</option>
</optgroup>
</select>
</body>
</html>