<button id="ok">ok</button>
<button id="toggle">toggle</button>
<script>
  var state = false;
  document.getElementById('toggle').addEventListener('click', function(evt) {
  document.getElementById('ok').disabled = state;
    state = !state;
console.log(state);
  }, true);
  </script>

- click toggle
- notice the accessible state for the ok button

expected:
disabled set

actual:
disabled not set