title: HTML5 - Select multi required-checkbox
body: <p>I've writen some code here: <a href="http://jsfiddle.net/anhtran/kXsj9/8/" rel="nofollow">http://jsfiddle.net/anhtran/kXsj9/8/</a></p>
  
  <p>Users have to select at least 1 option on the group. But it makes me must click all of them to submit the form. How to do this issue without javascript?</p>
  
  <p>Thanks for any help :)</p>