77 lines
3.6 KiB
HTML
77 lines
3.6 KiB
HTML
<!doctype html>
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<title>enumerateDevices() with navigation</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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'use strict';
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const blank_url = '/common/blank.html';
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const search2 = '?2';
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function promise_new_task(t) {
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return new Promise(resolve => t.step_timeout(resolve, 0));
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}
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function promise_event(target, name) {
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return new Promise(resolve => target[`on${name}`] = resolve);
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}
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promise_test(async t => {
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// Gecko persists only toplevel documents, so load documents in a toplevel.
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await test_driver.bless('window.open()');
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const proxy = window.open(blank_url);
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t.add_cleanup(() => proxy.close());
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await promise_event(proxy, 'pageshow');
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const devices = proxy.navigator.mediaDevices;
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// Use another task so that another load creates a new session history entry.
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await promise_new_task(t);
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proxy.location = blank_url + search2;
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await promise_event(proxy, 'pagehide');
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// Use another task to ensure the first subdocument is no longer fully
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// active and proxy refers to the realm of the second document.
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await promise_new_task(t);
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assert_equals(proxy.location.search, search2, 'navigated search');
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// Enumerate from the inactive first Window.
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const promise_enumerate = devices.enumerateDevices();
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// `then()` is used rather than static Promise methods because microtasks
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// for `PromiseResolve()` do not run when Promises from inactive realms are
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// involved. Whether microtasks for `then()` run depends on the realm of
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// the handler rather than the realm of the Promise.
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// Don't use `finally()`, because it uses `PromiseResolve()` and so
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// microtasks don't run.
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// See https://github.com/whatwg/html/issues/5319.
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let promise_state = 'pending';
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promise_enumerate.then(() => promise_state = 'resolved',
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() => promise_state = 'rejected');
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// Enumerate in the active second Window to provide enough time to check
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// that the Promise from the inactive Window does not settle.
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await proxy.navigator.mediaDevices.enumerateDevices();
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proxy.history.back();
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await promise_event(proxy, 'pagehide');
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// enumerateDevices() Promise resolution is triggered only in parallel
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// steps, so manipulation of the Promise (if the first document was
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// persisted) would occur through a queued task, which would run after
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// the pagehide event is dispatched and so after the associated
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// microtask that runs the following assert.
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// https://html.spec.whatwg.org/multipage/webappapis.html#event-loop-for-spec-authors
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assert_equals(promise_state, 'pending', 'Promise state while inactive');
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// If the first document is restored, then that will occur immediately after
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// pagehide (and associated microtasks), before the next global task is run.
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// https://html.spec.whatwg.org/multipage/history.html#traverse-the-history-by-a-delta
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await promise_new_task(t);
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if (proxy.navigator.mediaDevices == devices) {
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// The first document was persisted and restored.
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assert_equals(proxy.location.search, '', 'history search');
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await promise_enumerate;
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} else {
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// The first document was not restored, but gets re-fetched.
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await t.step_wait(() => proxy.location.search == '', 'navigation');
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assert_not_equals(proxy.navigator.mediaDevices, devices, 'new realm')
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await proxy.navigator.mediaDevices.enumerateDevices();
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assert_equals(promise_state, 'pending', 'Promise state after discard');
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}
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}, 'enumerateDevices with navigation');
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</script>
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