File: getElementById-dynamic-002.html

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<!doctype html>
<title>Shadow DOM: Modifying an element ID inside a disconnected shadow root does not break getElementById</title>
<link rel="help" href="https://dom.spec.whatwg.org/#dom-nonelementparentnode-getelementbyid">
<link rel="author" name="Simon Wülker">
<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();
  host.shadowRoot.getElementById("test-id").id = "new-id";

  assert_equals(host.shadowRoot.getElementById("new-id"), element);
}, "ShadowRoot.getElementById works on elements whose id was modified after the root was disconnected");
</script>