File: focus-sync-when-blur.html

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<!doctype html>
<head>
  <meta charset=utf-8>
  <meta name="viewport" content="width=device-width,initial-scale=1">
  <title>Test calling focus() on the same element in "blur" event listener when focus has moved away</title>
  <script src=/resources/testharness.js></script>
  <script src=/resources/testharnessreport.js></script>
</head>
<body>
  <input id="input1" placeholder="input1"/>
  <input id="input2" placeholder="input2"/>
</body>
<script>
// This test tests calling focus() in the "blur" event
// listener on the same element again when the focus has
// moved away.
test((t) => {
  let counter = 0;
  input1.addEventListener("focus", function(e) {
    counter++;
  });

  input1.addEventListener("blur", function(e) {
    input1.focus();
  });

  input1.focus();
  input2.focus();

  assert_equals(counter, 2, "Should have received 2 focus events on input1");
  assert_equals(document.activeElement, input1, "Focused element should be still input1");
}, "Element.focus() in blur listener when focus has moved away");
</script>