File: sandbox-initial-empty-document-toward-same-origin.html

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<!DOCTYPE html>
<meta charset=utf-8>
<title>
  Check sandbox-flags inheritance in case of javascript window reuse.
</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))
  );

  // Create an initial empty document in the iframe, sandboxed. It will attempt
  // to load a slow page, but won't have time.
  let iframe = document.createElement("iframe");
  iframe.setAttribute("sandbox", "allow-scripts allow-same-origin");
  iframe.src = "/fetch/api/resources/infinite-slow-response.py";
  document.body.appendChild(iframe);

  // Remove sandbox flags. This should apply to documents committed from
  // navigations started after this instruction.
  iframe.removeAttribute("sandbox");
  iframe.src = "./resources/check-sandbox-flags.html";

  // The window is reused, but the new sandbox flags should be used.
  assert_equals(await message, "document-domain-is-allowed");
});
</script>