LayoutTests/fast/forms/input-readonly-focus.html

<html>
<head>
<script>
async function runTest() {
  window.testRunner.dumpAsText();

  var input = document.getElementById('i');
  await eventSender.asyncMouseMoveTo(input.offsetLeft + input.offsetWidth / 2, input.offsetTop + input.offsetHeight / 2);
  await eventSender.asyncMouseDown();
  await eventSender.asyncMouseUp();
}
window.onload = async function() {
  var input = document.getElementById('i');
  input.onfocus = function(e) {
    document.body.innerHTML = 'PASS';
  }
  if (window.testRunner) {
    testRunner.waitUntilDone();
    await runTest();
    testRunner.notifyDone();
  }
}
</script>
</head>
<body>
<input id="i" readonly>
</body>
</html>