45 lines
2 KiB
HTML
45 lines
2 KiB
HTML
<!doctype html>
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<title>Test for rejected promise from getDisplayMedia() in a discarded browsing
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context</title>
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<script src=/resources/testharness.js></script>
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<script src=/resources/testharnessreport.js></script>
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<script src="/resources/testdriver.js"></script>
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<script src='/resources/testdriver-vendor.js'></script>
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<body></body>
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<script>
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// https://w3c.github.io/mediacapture-screen-share/#dom-mediadevices-getdisplaymedia
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// If the current settings object's responsible document is NOT fully active,
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// return a promise rejected with a DOMException object whose name attribute
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// has the value "InvalidStateError".
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promise_test(async () => {
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const frame = document.createElement('iframe');
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document.body.appendChild(frame);
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frame.srcdoc = '<html></html>';
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await new Promise(resolve => frame.onload = resolve);
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const child_window = frame.contentWindow;
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const devices = child_window.navigator.mediaDevices;
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const child_DOMException = child_window.DOMException;
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// transient activation of iframe content
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await test_driver.bless('getDisplayMedia()', undefined, child_window);
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frame.remove();
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// `catch()` is used rather than static Promise methods because microtasks
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// for `PromiseResolve()` do not run when Promises in inactive Documents are
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// involved. Whether microtasks for `catch()` run depends on the realm of
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// the handler rather than the realm of the Promise.
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// See https://github.com/whatwg/html/issues/5319.
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let promise_already_rejected = false;
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let rejected_reason;
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devices.getDisplayMedia({video:true}).catch(reason => {
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promise_already_rejected = true;
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rejected_reason = reason;
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});
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// Race a settled promise to check that the returned promise is already
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// rejected.
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await Promise.reject().catch(() => {
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assert_true(promise_already_rejected,
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'should have returned an already-rejected promise.');
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assert_throws_dom('InvalidStateError', child_DOMException,
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() => { throw rejected_reason });
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});
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}, 'getDisplayMedia() in a discarded browsing context');
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</script>
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