html5: Significance of attribute named required in checkbox/radio

Question

On form submission, how could you possibly mark a checkbox/radiobutton as required?

Source of inspiration: Pekka\'s answer to a question

Answer 1

Required checkboxes are not unusual. Practically every registration form uses some form of the "I have read and accept the User Agreement" checkbox.

If you have Opera handy try out the code below. The form won't submit unless the checkbox is checked.

  



  
html5 test
  

    
    required checkbox