File: focus-double-sync-calls.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() in "focus" 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 "focus" event
// listener on the element again when the focus has
// moved away.

// This is for https://github.com/whatwg/html/pull/11182
async_test((t) => {
  let previouslyCalled = false;
  let counter = 0;

  input1.addEventListener("focus", function(e) {
    counter++;
    if (!previouslyCalled) {
      input2.focus();
      previouslyCalled = true;
    }

    input1.focus();

    if (counter !== 2) {
      // If `lock-for-focus` is implemented, the above input1.focus()
      // shouldn't work, so the counter should never be 2.
      assert_unreached();
    }
    t.done();
  });

  input1.focus();
}, "Element.focus() in focus listener when focus has moved away");
</script>