<!DOCTYPE html>
<meta charset="utf-8">
<title>Moving script elements between documents during evaluation</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/#execute-the-script-block">

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

<body>
<script id="outerScript">
"use strict";

async_test(t => {
  const outerScript = document.querySelector('#outerScript');
  assert_equals(document.currentScript, outerScript);

  const innerScript = document.createElement('script');
  window.innerScript = innerScript;

  window.innerScriptEvaluated = false;
  window.anotherDocument = null;

  innerScript.innerText = `
    window.innerScriptEvaluated = true;
    const innerScript = window.innerScript;
    assert_equals(document.currentScript, innerScript,
        '[1] Before move: currentScript of source Document');
    assert_equals(innerScript.ownerDocument, document,
        '[1] Before move: ownerDocument');

    window.anotherDocument = document.implementation.createHTMLDocument();
    window.anotherDocument.body.appendChild(innerScript);

    assert_equals(innerScript.ownerDocument, anotherDocument,
        '[2] Just after move: ownerDocument');
    assert_equals(document.currentScript, innerScript,
        '[2] Just after move: currentScript of source Document');
    assert_equals(anotherDocument.currentScript, null,
        '[2] Just after move: currentScript of destination Document');
  `;

  document.body.appendChild(innerScript);
  assert_true(window.innerScriptEvaluated,
      'Inner script should be evaluated synchronously');

  assert_equals(document.currentScript, outerScript,
      '[3] After inner script: currentScript of source Document');
  assert_equals(window.anotherDocument.currentScript, null,
      '[3] After inner script: currentScript of destination Document');

  t.step_timeout(() => {
    assert_equals(document.currentScript, null,
        '[4] After outer script: currentScript of source Document');
    assert_equals(anotherDocument.currentScript, null,
        '[4] After outer script: currentScript of destination Document');
    t.done();
  }, 0);
}, 'Script moved between documents during evaluation');
</script>
