I am trying to understand html's <label> attribute. According to http://www.w3.org/TR/html4/interact/forms.html#h-17.9
when I am using a single label for multiple elements I should use the following format: label for = idref [CS]. From what I understand [CS] represents names of the elements that I am labeling. But what is idref? What am I suppose to put there? Would someone kindly post a small example please?