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<html lang="en">3
<head>4
<title>HTML Form Elements</title>5
</head>6
<body>7
<h1>HTML Form Elements</h1>8
<form>9
<label for="courses">Choose a Course:</label>10
<select name="course" id="courses">11
<optgroup label="Front-End">12
<option value="HTML">HTML</option>13
<option value="CSS">CSS</option>14
<option value="JS">JS</option>15
</optgroup>16
<optgroup label="Back-End">17
<option value="PHP">PHP</option>18
<option value="MYSQL">MYSQL</option>19
</optgroup>20
</select>21
<input type="submit" value="Submit">22
</form>23
</body>24
</html>