redirect-to-unparseable-url.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/browsers/browsing-the-web/navigating-across-documents/redirect-to-unparseable-url.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Session history interaction with redirects to unparseable URLs</title>

<link rel="help" href="https://html.spec.whatwg.org/#create-navigation-params-by-fetching">

<link rel="help" href="https://html.spec.whatwg.org/#read-ua-inline">

<script src="/common/utils.js"></script>

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

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

<body>

<script>

const kUnparseableURL = self.origin + ":notaport/common/blank.html";

promise_test(async t => {

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

  t.add_cleanup(() => {

    iframe.remove();

});

  function getIframeLoadPromise() {

    return new Promise(resolve => {

      iframe.addEventListener('load', () => {

        // Wait for the iframe to load + one task so that its navigations are

        // not done in "replace" mode.

        t.step_timeout(resolve, 0);

      }, {once: true});

});

  document.body.append(iframe);

  assert_equals(history.length, 1, "Precondition: history.length is 1");

  const first_load_promise = getIframeLoadPromise();

  iframe.src = '/common/blank.html';

  await first_load_promise;

  // This navigation will fail, because it redirects to an unparseable URL.

  const error_load_promise = getIframeLoadPromise();

  const error_url = new URL('resources/no-cache-single-redirect.py', location.href);

  error_url.searchParams.append('uuid', token());

  error_url.searchParams.append('location', kUnparseableURL);

  iframe.src = error_url;

  await error_load_promise;

  assert_equals(history.length, 2,

      "history.length is 2 after two iframe navigations beyond the initial " +

      "about:blank Document, the first of which 'replaced' the initial " +

      "about:blank Document");

  // Per https://html.spec.whatwg.org/#read-ua-inline, error Documents have

  // opaque origins, so the `contentDocument` shouldn't be accessible.

  assert_equals(iframe.contentDocument, null,

      "Cannot reach iframe.contentDocument for error Documents");

  const back_load_promise = getIframeLoadPromise();

  history.back();

  await back_load_promise;

  const forward_load_promise = getIframeLoadPromise();

  history.forward();

  await forward_load_promise;

  assert_not_equals(iframe.contentDocument, null, "iframe.contentDocument is accessible");

  assert_equals(iframe.contentDocument.body.innerText, "No redirect",

      "Traversal to history entry whose URL was once associated with an " +

      "error Document correctly requests the same URL again");

}, "Navigating to a url (A) that redirects to an unparseable URL (B), saves " +

   "the URL (A) in the history entry, for later traversal");

</script>

</body>