prerender.https.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:
- /fenced-frame/prerender.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Test prerendering</title>

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

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

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

<script src="/resources/testdriver-vendor.js"></script>

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

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

<body>

<script>

promise_test(async t => {

  assert_implements(

      'supports' in HTMLScriptElement,

      'HTMLScriptElement.supports is not supported');

  assert_implements(

      HTMLScriptElement.supports('speculationrules'),

      '<script type="speculationrules"> is not supported');

  const prerender_ready_key = token();

  const prerender_loaded_key = token();

  const prerender_activated_key = token();

  const url = generateURL('resources/prerender-inner.html',

      [prerender_ready_key, prerender_loaded_key, prerender_activated_key]);

  // TODO: This test expects that the browser always triggers prerendering when

  // SpeculationRules is provided. But SpeculationRules allows browsers not to

  // trigger the speculative resource loading even if SpeculationRules is

  // specified. So we have to use a new WebDriver API that deterministically

  // triggers prerendering.

  // https://github.com/WICG/nav-speculation/blob/main/speculation-rules-testing.md

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

  script.type = 'speculationrules';

  script.text = `{"prerender": [{"source": "list", "urls": ["${url}"] }] }`;

  document.head.appendChild(script);

  const ready_result = await nextValueFromServer(prerender_ready_key);

  assert_equals(ready_result, 'ready');

  attachFencedFrame(url);

  const loaded_or_acrivated_result = await Promise.race([

      nextValueFromServer(prerender_loaded_key),

      nextValueFromServer(prerender_activated_key)

]);

  assert_equals(loaded_or_acrivated_result, 'loaded');

}, 'Fenced Frame must not load prerendered page.');

</script>

</body>