inert/nested-inert-unfocusable.html

<!DOCTYPE html>
<title>Nested inert, focusability and dynamic changes</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#inert">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="outer" inert>
  <div id="inner" inert>
    <input id="inp" type="text">
  </div>
</div>
<script>
  test(() => {
    inp.focus();
    assert_not_equals(document.activeElement, inp);
  }, "Input element in nested inerts is not focusable");

  test(() => {
    outer.inert = false;
    inp.focus();
    assert_not_equals(document.activeElement, inp);
  }, "Input element still not focusable after outer inert removed");

  test(() => {
    inner.inert = false;
    inp.focus();
    assert_equals(document.activeElement, inp);
  }, "Input element focusable with both inerts removed");

</script>