Back Code Run <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <form> <label for="country">Country</label> <select id="country"> <option value="">--- Select your country ---</option> <optgroup label="Asia"> <option value="india">India</option> <option value="japan">Japan</option> <option value="china">China</option> </optgroup> <optgroup label="Europe"> <option value="germany">Germany</option> <option value="france">France</option> <option value="italy">Italy</option> </optgroup> <optgroup label="North America"> <option value="canada">Canada</option> <option value="united-states">United States</option> <option value="mexico">Mexico</option> </optgroup> </select> <br><br> <button type="submit" >Submit</button> </form> </body> </html> Result
