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diff --git a/dom/media/autoplay/test/mochitest/file_autoplay_policy_eventdown_activation.html b/dom/media/autoplay/test/mochitest/file_autoplay_policy_eventdown_activation.html
new file mode 100644
index 0000000000..e25b6401d1
--- /dev/null
+++ b/dom/media/autoplay/test/mochitest/file_autoplay_policy_eventdown_activation.html
@@ -0,0 +1,85 @@
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <title>Autoplay policy window</title>
+  <style>
+    video {
+      width: 50%;
+      height: 50%;
+    }
+  </style>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script type="text/javascript" src="manifest.js"></script>
+  <script type="text/javascript" src="AutoplayTestUtils.js"></script>
+</head>
+
+<body>
+  <pre id="test">
+      <script>
+
+        window.ok = window.opener.ok;
+        window.is = window.opener.is;
+        window.info = window.opener.info;
+
+        async function testEventDownActivates(eventNames, activator) {
+          let element = document.createElement("video");
+          element.preload = "auto";
+          element.src = "short.mp4";
+          document.body.appendChild(element);
+
+          await once(element, "loadedmetadata");
+
+          let played = await element.play().then(() => true, () => false);
+          ok(!played, "Document should start out not activated, with playback blocked.");
+
+          let x = eventNames.map(
+            (eventName) => {
+              return new Promise(function (resolve, reject) {
+                window.addEventListener(eventName, async function (event) {
+                  let p = await element.play().then(() => true, () => false);
+                  ok(p, "Expect to be activated already in " + eventName);
+                  resolve();
+                });
+              });
+            });
+
+          activator();
+
+          await Promise.all(x);
+
+          removeNodeAndSource(element);
+        }
+
+        nextWindowMessage().then(
+          async (event) => {
+            try {
+              if (event.data == "run keydown test") {
+                await testEventDownActivates(["keydown", "keypress", "keyup"], () => {
+                  document.body.focus();
+                  synthesizeKey(" ");
+                });
+              } else if (event.data == "run mousedown test") {
+                let events = ["mousedown", "mouseup", "click"];
+                if (getAndroidVersion() < 0) {
+                  // Non-Android, also listen on pointer events.
+                  events.push("pointerdown", "pointerup");
+                }
+                await testEventDownActivates(events, () => {
+                  synthesizeMouseAtCenter(document.body, {});
+                });
+              } else {
+                ok(false, "unexpected message");
+              }
+            } catch (e) {
+              ok(false, "Caught exception " + e + " " + e.message + " " + e.stackTrace);
+            }
+            event.source.postMessage("done", "*");
+          });
+
+      </script>
+    </pre>
+</body>
+
+</html>