nested-focus-within-iframe-focus-event.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /focus/nested-focus-within-iframe-focus-event.html - WPT Dashboard Interop Dashboard

<!doctype html>

<head>

  <meta charset=utf-8>

  <meta name="viewport" content="width=device-width,initial-scale=1">

  <title>Test calling dialog focusing steps in navigable's focus handler</title>

  <script src=/resources/testharness.js></script>

  <script src=/resources/testharnessreport.js></script>

</head>

<body>

  <iframe id="iframe" srcdoc="<dialog>Hello</dialog>"></iframe>

</body>

<script>

// https://github.com/whatwg/html/pull/11182

window.onload = function() {

  async_test((t) => {

    iframe.addEventListener("focus", function() {

      const dialog = iframe.contentDocument.body.querySelector("dialog");

      dialog.showModal();

      // If `lock-for-focus` is implemented, showModal() can't

      // trigger the dialog-focusing-steps, hence the activeElement

      // shouldn't be the dialog.

      assert_equals(iframe.contentDocument.activeElement, dialog);

      t.done();

})

    iframe.focus();

  }, "dialog.focus() in navigable's focus handler");

</script>