title: Why do html checkboxes only transmit an 'on' value?
body: <p>I'm just starting to learn internet programming.</p>
  
  <p>After playing around with checkboxes, I found out the hard way, that it is only when the checkbox is checked that it transmits an 'on' value.</p>
  
  <p>Why not also send an 'off' value?</p>