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chromium/third_party/blink/web_tests/external/wpt/html/interaction/focus/focus-management/focus-events.html 

<!DOCTYPE html>
<meta charset=utf-8>
<title>Focus management</title>
<link rel="author" title="Denis Ah-Kang" href="mailto:[email protected]">
<link rel=help href="https://html.spec.whatwg.org/multipage/#focus-management">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<input type=text id=i1>
<input type=text id=i2>
<script>
  var i1 = document.getElementById('i1'),
  i2 = document.getElementById('i2'),
  t1 = async_test("focusing on a focusable element fires a focus event at the element"),
  t2 = async_test("focusing on a focusable element fires a blur event at the previous focussed element");

  i2.onfocus = t1.step_func_done(function(e){
    assert_true(e.isTrusted, "focus event is trusted");
    assert_false(e.bubbles, "focus event doesn't bubble");
    assert_false(e.cancelable, "focus event is not cancelable");
    assert_equals(document.activeElement, i2);
  });

  i1.onblur = t2.step_func_done(function(e){
    assert_true(e.isTrusted, "blur event is trusted");
    assert_false(e.bubbles, "blur event doesn't bubble");
    assert_false(e.cancelable, "blur event is not cancelable");
    assert_equals(document.activeElement, document.body);
  });

  i1.focus();
  i2.focus();
</script>