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diff --git a/testing/web-platform/tests/mediacapture-streams/MediaDevices-after-discard.https.html b/testing/web-platform/tests/mediacapture-streams/MediaDevices-after-discard.https.html
new file mode 100644
index 0000000000..ef4f492964
--- /dev/null
+++ b/testing/web-platform/tests/mediacapture-streams/MediaDevices-after-discard.https.html
@@ -0,0 +1,64 @@
+<!doctype html>
+<title>Test promises from MediaDevices methods 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>
+<script src=permission-helper.js></script>
+<body></body>
+<script>
+let devices;
+let child_DOMException;
+setup(() => {
+  const frame = document.createElement('iframe');
+  document.body.appendChild(frame);
+  devices = frame.contentWindow.navigator.mediaDevices;
+  child_DOMException = frame.contentWindow.DOMException;
+  frame.remove();
+});
+
+// https://w3c.github.io/mediacapture-main/#dom-mediadevices-getusermedia
+// 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 () => {
+  await setMediaPermission("granted", ["microphone"]);
+  // `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.getUserMedia({audio: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 });
+  });
+}, 'getUserMedia() in a discarded browsing context');
+
+// https://w3c.github.io/mediacapture-main/#dom-mediadevices-enumeratedevices
+// https://w3c.github.io/mediacapture-main/#device-enumeration-can-proceed
+// Device enumeration can proceed steps return false when device enumeration
+// can be exposed is true and the document is not fully active.
+promise_test(async () => {
+  let promise_state = 'pending';
+  // `then()` is used to avoid methods that apply `PromiseResolve()` to
+  // Promises from inactive realms, which would lead to microtasks that don't
+  // run.
+  devices.enumerateDevices().then(() => promise_state = 'resolved',
+                                  () => promise_state = 'rejected');
+  // Enumerate in the parent document to provide enough time to check that the
+  // Promise from the inactive document does not settle.
+  await navigator.mediaDevices.enumerateDevices();
+  assert_equals(promise_state, 'pending', 'Promise state');
+}, 'enumerateDevices() in a discarded browsing context');
+</script>