A large number of (dare I say most?) sites do not make the labels clickable for their checkbox and radio inputs. It seems to be a huge usability gain for very little effort. Are there any compatibility/functionality/usability issues with using <label>
that would discourage developers from using this tag?
Even Stack Overflow seems guilty of this, e.g., when asking a question, the Notify daily of any new answers checkbox label is not clickable.
<label>
was introduced in HTML 4, well after HTML forms came about. So it's not used mainly because the tradition (learning from view-source) doesn't include it, and it's not necessary for proper visual appearance and ordinary functionality (clickable checkboxes). – Kevin Reid