<!doctype html>
<title>Shadow DOM: ShadowRoot.getElementById in shadow trees keeps working after host is removed from tree</title>
<link rel="help" href="https://dom.spec.whatwg.org/#dom-nonelementparentnode-getelementbyid">
<link rel="help" href="https://bugzil.la/1475203">
<link rel="author" name="Emilio Cobos Álvarez" href="emilio@crisal.io">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="host"></div>
<script>
test(function() {
  let host = document.getElementById("host");
  host.attachShadow({ mode: "open" }).innerHTML = `<div id="test-id"></div>`;

  let element = host.shadowRoot.getElementById("test-id");
  assert_true(!!element);

  host.remove();
  assert_equals(host.shadowRoot.getElementById("test-id"), element);

  element.remove();
  assert_equals(host.shadowRoot.getElementById("test-id"), null);
}, "ShadowRoot.getElementById keeps working after host has been removed");
</script>