accept-client-hint-cache.https.html

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prerender/accept-client-hint-cache.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Test Prerender pages maintain their own Client Hint Caches</title>

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

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

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

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

<script src="/client-hints/resources/open-and-add-load-event.js"></script>

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

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

<body>

<script>

setup(() => assertSpeculationRulesIsSupported());

promise_test(

  async t => {

    const uid = token();

    const initialization_bc = new PrerenderChannel(`test-channel`, uid);

    t.add_cleanup(_ => initialization_bc.close());

    const gotMessage = new Promise(resolve => {

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

        resolve(e.data);

      }, {once: true});

});

    // Initialization. For the active pages, it has the client hint cache of

    // "sec-ch-ua-bitness".

    await open_and_add_load_event('resources/accept-ch.html');

    window.open(

        `resources/echo-client-hints-received.py?uid=${uid}`, '_blank',

        'noopener');

    const result = await gotMessage;

    assert_equals(result.result, 'PASSED', result.reason);

},

  'Prerender page should maintain their own client hints cache and do not propagate it to' +

      'the global cache until activation');

</script>