anchor.diff:              forwardButton.addEventListener('mouseup', e => post('stop'));
               backwardButton.addEventListener('mousedown', e => post('backward'));
               backwardButton.addEventListener('mouseup', e => post('stop'));
  +            ledOnButton.addEventListener('mousedown', e => post('on'));
  +            ledOffButton.addEventListener('mousedown', e => post('off'));
  
positive.code:                 margin: 20px auto;
                  font-size: 1em;
                  color: white;
                  background-color: #1F3A93;
                  border-radius: 10px;
                  -webkit-appearance: none;
                  user-select: none;
  
negative.code:                 -ms-user-select: none;
                  -o-user-select: none;
              }
              #motor button {
                  background-color: #1F3A93;
              }
              #led button {
                  background-color: #CF000F;
              }
      body
          h1 R2-D2 Controller
          div#motor
              button#forward forward
              button#backward backward
          div#led
              button#on LED on
              button#off LED off
          script.
              var forwardButton = document.getElementById('forward');
              var backwardButton = document.getElementById('backward');
              var ledOnButton = document.getElementById('on');
              var ledOffButton = document.getElementById('off');
              
              function post(req) {
                  var xhr = new XMLHttpRequest();
  