<!DOCTYPE html>
<meta charset=utf-8>
<title>
  Check sandbox-flags aren't lost after using document.open().
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
promise_test(async test => {
  let message = new Promise(resolve =>
    window.addEventListener("message", event => resolve(event.data))
  );

  let iframe = document.createElement("iframe");
  iframe.setAttribute("sandbox", "allow-scripts allow-same-origin");
  iframe.setAttribute("src", "./resources/document-open.html")
  document.body.appendChild(iframe);

  assert_equals(await message, "document-domain-is-disallowed");
}, "document.open()");

promise_test(async test => {
  let iframe = document.createElement("iframe");
  iframe.setAttribute("sandbox", "allow-scripts allow-same-origin");
  iframe.setAttribute("src", "/common/blank.html");
  let loaded = new Promise(resolve => iframe.onload = resolve);
  document.body.appendChild(iframe);
  await loaded;

  let message = new Promise(resolve =>
    window.addEventListener("message", event => resolve(event.data))
  );

  iframe.contentDocument.write(`
    <script>
      try {
        document.domain = document.domain;
        parent.postMessage('document-domain-is-allowed', '*');
      } catch (error) {
        parent.postMessage('document-domain-is-disallowed', '*');
      }
    </sc`+`ript>
  `);

  assert_equals(await message, "document-domain-is-disallowed");
}, "other_document.open()");
</script>
</body>
</html>