getdisplaymedia-after-discard.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:
- /screen-capture/getdisplaymedia-after-discard.https.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Test for rejected promise from getDisplayMedia() in a discarded browsing

  context</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>

<body></body>

<script>

// https://w3c.github.io/mediacapture-screen-share/#dom-mediadevices-getdisplaymedia

// If the current settings object's responsible document is NOT fully active,

// return a promise rejected with a DOMException object whose name attribute

// has the value "InvalidStateError".

promise_test(async () => {

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

  document.body.appendChild(frame);

  frame.srcdoc = '<html></html>';

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

  const child_window = frame.contentWindow;

  const devices = child_window.navigator.mediaDevices;

  const child_DOMException = child_window.DOMException;

  // transient activation of iframe content

  await test_driver.bless('getDisplayMedia()', undefined, child_window);

  frame.remove();

  // `catch()` is used rather than static Promise methods because microtasks

  // for `PromiseResolve()` do not run when Promises in inactive Documents are

  // involved.  Whether microtasks for `catch()` run depends on the realm of

  // the handler rather than the realm of the Promise.

  // See https://github.com/whatwg/html/issues/5319.

  let promise_already_rejected = false;

  let rejected_reason;

  devices.getDisplayMedia({video:true}).catch(reason => {

    promise_already_rejected = true;

    rejected_reason = reason;

});

  // Race a settled promise to check that the returned promise is already

  // rejected.

  await Promise.reject().catch(() => {

    assert_true(promise_already_rejected,

                'should have returned an already-rejected promise.');

    assert_throws_dom('InvalidStateError', child_DOMException,

                      () => { throw rejected_reason });

});

}, 'getDisplayMedia() in a discarded browsing context');

</script>