yield-scripted-subframe-propagation.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:
- /scheduler/tentative/yield/yield-scripted-subframe-propagation.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

<script>

  async function getResultsInOrder(promises) {

    const results = [];

    const tasks = promises.map(p => p.then(r => results.push(r)));

    await Promise.all(tasks);

    return results;

  promise_test(async t => {

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

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

    iframe.srcdoc = `

      <script>

      window.task = async function() {

        await scheduler.yield();

        return "inner";

      </scr`+`ipt>

`;

    const p = new Promise(resolve => iframe.onload = resolve);

    document.body.appendChild(iframe);

    await p;

    let task1 = scheduler.postTask(

        iframe.contentWindow.task, {priority: 'user-blocking'});

    let task2 = scheduler.postTask(() => "outer", {priority: 'user-blocking'});

    let result = await getResultsInOrder([task1, task2]);

    assert_equals(result.toString(), "inner,outer",

        "Expected inner before outer for iframe task with main frame scheduler");

    task1 = iframe.contentWindow.scheduler.postTask(

        iframe.contentWindow.task, {priority: 'user-blocking'});

    task2 = scheduler.postTask(() => "outer", {priority: 'user-blocking'});

    result = await getResultsInOrder([task1, task2]);

    assert_equals(result.toString(), "inner,outer",

        "Expected inner before outer for iframe task with iframe scheduler");

    task1 = scheduler.postTask(

        async () => await iframe.contentWindow.task(), {priority: 'user-blocking'});

    task2 = scheduler.postTask(() => "outer", {priority: 'user-blocking'});

    result = await getResultsInOrder([task1, task2]);

    assert_equals(result.toString(), "inner,outer",

        "Expected inner before outer for iframe task called from main frame task");

  }, 'Test scheduler.yield() uses propagated state in same origin frames');

</script>