wpt/css/selectors/focus-within-toplayer-001.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Selectors: :focus-within should not propagate past top layer elements</title>
<link rel="help" href="https://drafts.csswg.org/selectors/#the-focus-within-pseudo">
<link rel="help" href="https://drafts.csswg.org/css-position-4/#top-layer">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  dialog::backdrop {
    background: transparent;
  }
</style>

<div id="outer">
  <dialog id="dialog">
    <input id="dialogInput">
  </dialog>
</div>

<div id="popoverOuter">
  <div id="popover" popover>
    <input id="popoverInput">
  </div>
</div>

<div id="nestOuter">
  <dialog id="nestDialog">
    <div id="nestPopover" popover>
      <input id="nestInput">
    </div>
  </dialog>
</div>

<script>
test(t => {
  const dialog = document.getElementById('dialog');
  dialog.showModal();
  t.add_cleanup(() => dialog.close());

  const dialogInput = document.getElementById('dialogInput');
  const outer = document.getElementById('outer');

  dialogInput.focus();
  assert_true(dialogInput.matches(':focus'), 'input should be focused');
  assert_true(dialog.matches(':focus-within'), 'dialog (top layer) should match :focus-within');
  assert_false(outer.matches(':focus-within'), 'ancestor outside top layer should not match :focus-within');
  assert_false(document.body.matches(':focus-within'), 'body should not match :focus-within');
}, 'Focusing inside a modal dialog should not propagate :focus-within beyond the dialog.');

test(t => {
  const popover = document.getElementById('popover');
  popover.showPopover();
  t.add_cleanup(() => popover.hidePopover());

  const popoverInput = document.getElementById('popoverInput');
  const popoverOuter = document.getElementById('popoverOuter');

  popoverInput.focus();
  assert_true(popoverInput.matches(':focus'), 'input should be focused');
  assert_true(popover.matches(':focus-within'), 'popover (top layer) should match :focus-within');
  assert_false(popoverOuter.matches(':focus-within'), 'ancestor outside top layer should not match :focus-within');
  assert_false(document.body.matches(':focus-within'), 'body should not match :focus-within');
}, 'Focusing inside a popover should not propagate :focus-within beyond the popover.');

test(t => {
  const nestDialog = document.getElementById('nestDialog');
  nestDialog.showModal();
  t.add_cleanup(() => nestDialog.close());

  const nestPopover = document.getElementById('nestPopover');
  nestPopover.showPopover();
  t.add_cleanup(() => nestPopover.hidePopover());

  const nestInput = document.getElementById('nestInput');
  const nestOuter = document.getElementById('nestOuter');

  nestInput.focus();
  assert_true(nestInput.matches(':focus'), 'input should be focused');
  assert_true(nestPopover.matches(':focus-within'), 'popover (innermost top layer) should match :focus-within');
  assert_false(nestDialog.matches(':focus-within'), 'dialog (outer top layer) should not match :focus-within');
  assert_false(nestOuter.matches(':focus-within'), 'ancestor outside both top layers should not match :focus-within');
}, 'With nested top layer elements, :focus-within should stop at the innermost top layer boundary.');
</script>