sandboxed-iframe-child.https.html

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This WPT test may be referenced by the following Test IDs:
- /secure-contexts/sandboxed-iframe-child.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>An iframe nested in a sandboxed iframe is a secure context</title>

<link rel=help href="https://html.spec.whatwg.org/multipage/webappapis.html#secure-context">

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

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

<script src=/common/get-host-info.sub.js></script>

<body>

<script>

promise_test(async t => {

  const { HTTPS_ORIGIN, HTTPS_NOTSAMESITE_ORIGIN } = get_host_info();

  const child = HTTPS_ORIGIN + "/secure-contexts/postMessage-helper.https.html";

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

  iframe.sandbox = "allow-scripts";

  iframe.src = HTTPS_NOTSAMESITE_ORIGIN + "/secure-contexts/support/iframe-with-child.html?src=" + encodeURIComponent(child);

  const message = new Promise(resolve => window.addEventListener("message", event => resolve(event.data), { once: true }));

  document.body.append(iframe);

  t.add_cleanup(() => iframe.remove());

  assert_true(await message);

}, "A cross-site iframe in a sandboxed cross-site iframe is a secure context");

</script>