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<!DOCTYPE html> <html lang="en"> <head> <title>Example of HTML select box with multiple selection</title> </head> <body> <form action=""> <select multiple="multiple"> <optgroup label="Sports cars"> <option value="ferrari">Ferrari</option> <option value="lamborghini">Lamborghini</option> </optgroup> <optgroup label="Luxury cars"> <option value="mercedes">Mercedes</option> <option value="bentley">Bentley</option> </optgroup> </select> </form> <p><strong>Note:</strong> Press control or shift key on the keyboard while clicking on the other options to enable multiple selections.</p> </body> </html>
