cross-origin-iframe-prerender-nesting.https.html

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prerender/cross-origin-iframe-prerender-nesting.https.html?target_hint=_blank - WPT Dashboard Interop Dashboard
- /speculation-rules/prerender/cross-origin-iframe-prerender-nesting.https.html?target_hint=_self - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<!--

Tests for cross-origin nested iframes `document.prerendering` state with/without

`Supports-Loading-Mode: prerender-cross-origin-frames` header on parent iframes.

File structure:

cross-origin-iframe-prerender-nesting.https.html (this page) - window.open() ->

  resources/cross-origin-iframe-prerender-nesting.html (prerender itself/prerendered top frame)

   | (Has Speculation Rule + SLM Header)

│

   ├── <iframe>resources/cross-origin-iframe-nesting-src-prerender.html

   │               | (Has SLM Header)

   │               │

   │               ├── <iframe> (Same-origin to parent)

   │               │

   │               └── <iframe> (Cross-origin to parent)

│

   └── <iframe>resources/cross-origin-iframe-nesting-src-no-slm-prerender.html

                   | (No SLM Header)

│

                   ├── <iframe> (Same-origin to parent)

│

                   └── <iframe> (Cross-origin to parent)

                       (Expected to be deferred because parent has no SLM)

-->

<title>Load nested iframes in a prerendered page</title>

<meta name="variant" content="?target_hint=_self">

<meta name="variant" content="?target_hint=_blank">

<meta name="timeout" content="long">

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

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

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

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

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

<body>

<script>

setup(() => assertSpeculationRulesIsSupported('prerender'));

promise_test(async t => {

  const uid = token();

  const bc = new PrerenderChannel('test-channel', uid);

  const gotMessage = new Promise(resolve => {

    bc.addEventListener('message', e => {

      resolve(e.data);

    }, {

      once: true

});

});

  const url = `resources/cross-origin-iframe-prerender-nesting.html?uid=${uid}&target_hint=${getTargetHint()}`;

  window.open(url, '_blank', 'noopener');

  const result = await gotMessage;

  assert_equals(result, 'iframe prerender finished correctly.');

  bc.close();

  // Send a close signal to PrerenderEventCollector on the prerendered page.

  new PrerenderChannel('close', uid).postMessage('');

}, `cross-origin nested iframes should follow parent SLM header rules.`);

</script>