iframe-first-load-canceled-second-load-blank.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-iframe-element/iframe-first-load-canceled-second-load-blank.html - WPT Dashboard Interop Dashboard

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

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

<script>

// Check about:blank navigation is asynchronous, even if the initial navigation

// is canceled.

promise_test(async test => {

  // Wait for document.body to exist, before appending the <iframe>.

  await new Promise(resolve => window.onload = resolve);

  // The initial navigation in this new iframe will result in a 204 No Content.

  // As a result the navigation will be canceled. The <iframe> will stay on the

  // initial empty document.

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

  iframe.src = "/common/blank.html?pipe=status(204)"

  document.body.appendChild(iframe);

  // The navigation in the iframe will be canceled. There are no good ways to

  // detect when it will happen. Anyway, any additional navigation must be

  // asynchronous. To test what happens when there are no pending navigation,

  // waiting one second should be enough, most of the time.

  await new Promise(resolve => test.step_timeout(resolve, 1000));

  let load_event_fired = false;

  const load_event_promise = new Promise(resolve => {

    iframe.onload = () => {

      load_event_fired = true;

      resolve();

};

});

  iframe.src = "about:blank";

  assert_equals(load_event_fired, false,

    "about:blank must not commit synchronously");

  await load_event_promise;

}, "about:blank navigation is asynchronous, even if the initial one is " +

  "canceled.");

</script>