function assert(value, desc) {
  var li = document.createElement('li');
  li.className = value ? 'pass' : 'fail';
  li.appendChild(document.createTextNode(desc));
  document.getElementById('results').appendChild(li);
}

window.onload = function() {
  assert(true, 'The test suite is running.');
  assert(false, 'Fail!');
};
Update t0