<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://github.com/whatwg/html/issues/8904">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/declarative-shadow-dom-polyfill.js"></script>

<button id=b1>button 1</button>
<button id=b2>button 2</button>
<div id=host>
  <template shadowrootmode=open>
    <button>button in shadowroot outside dialog</button>
  </template>
</div>
<dialog id=mydialog>
  <button id=b3>button in dialog</button>
  <div id=dialoghost>
    <template shadowrootmode=open>
      <button>button in shadowroot in dialog</button>
    </template>
  </div>
</dialog>

<div id=host2>
  <template shadowrootmode=open>
    <dialog>
      <slot></slot>
    </dialog>
  </template>
  <button id=host2button>button</button>
</div>

<script>
polyfill_declarative_shadow_dom(document);

test(() => {
  b1.focus();
  mydialog.show();
  b2.focus();
  mydialog.close();
  assert_equals(document.activeElement, b2);
}, 'Focus should not be restored if the currently focused element is not inside the dialog.');

test(() => {
  const shadowbutton = host.shadowRoot.querySelector('button');
  b2.focus();
  mydialog.show();
  shadowbutton.focus();
  mydialog.close();
  assert_equals(document.activeElement, host, 'document.activeElement should point at the shadow host.');
  assert_equals(host.shadowRoot.activeElement, shadowbutton, 'The button in the shadowroot should remain focused.');
}, 'Focus restore should not occur when the focused element is in a shadowroot outside of the dialog.');

test(() => {
  const shadowbutton = dialoghost.shadowRoot.querySelector('button');
  b2.focus();
  mydialog.show();
  shadowbutton.focus();
  mydialog.close();
  assert_equals(document.activeElement, b2);
}, 'Focus restore should occur when the focused element is in a shadowroot inside the dialog.');

test(() => {
  const dialog = host2.shadowRoot.querySelector('dialog');
  b2.focus();
  dialog.show();
  host2button.focus();
  dialog.close();
  assert_equals(document.activeElement, b2);
}, 'Focus restore should occur when the focused element is slotted into a dialog.');
</script>
