Node-appendChild-script-with-mutation-observer-takeRecords.html

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This WPT test may be referenced by the following Test IDs:
- /dom/nodes/insertion-removing-steps/Node-appendChild-script-with-mutation-observer-takeRecords.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>Node.appendChild: inserted script should be able to take own mutation record</title>

<script src=/resources/testharness.js></script>

<script src=/resources/testharnessreport.js></script>

<body>

<main></main>

<script>

test(() => {

  window.mutationObserver = new MutationObserver(() => {});

  window.mutationObserver.observe(document.querySelector("main"), {childList: true});

  const script = document.createElement("script");

  script.textContent = `

    window.mutationRecords = window.mutationObserver.takeRecords();

`;

  document.querySelector("main").appendChild(script);

  assert_equals(window.mutationRecords.length, 1);

  assert_array_equals(window.mutationRecords[0].addedNodes, [script]);

}, "An inserted script should be able to observe its own mutation record with takeRecords");

</script>