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

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This WPT test may be referenced by the following Test IDs:
- /html/browsers/sandboxing/sandbox-initial-empty-document-toward-same-origin.html - WPT Dashboard Interop Dashboard

<!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>