Code and Output for optgroup:

Code:

    <!DOCTYPE html>
    <html>
    <head>
      <title>HTML Example</title>
    </head>
    <body>
    <h1>The optgroup element</h1>
    <p>The optgroup tag is used to group related options in a drop-down list:</p>
   <form action="/action_page.php"≫
   <label for="cars">Choose a car:</label>
   <select name="cars" id="cars">
    <optgroup label="Swedish Cars">
      <option value="volvo">Volvo</option>
      <option value="saab">Saab</option>
    </optgroup>
    <optgroup label="German Cars">
      <option value="mercedes">Mercedes</option>
      <option value="audi">Audi</option>
    </optgroup>
  </select>
  <br><br>
  <input type="submit" value="Submit">
</form>
    </body>
    </html>
  

Output:

The optgroup element

The optgroup tag is used to group related options in a drop-down list: