diff --git a/webrtc/RTCRtpSender-replaceTrack.https.html b/webrtc/RTCRtpSender-replaceTrack.https.html
index 2f632e9fb4e6d7..a4b5548caaa67b 100644
--- a/webrtc/RTCRtpSender-replaceTrack.https.html
+++ b/webrtc/RTCRtpSender-replaceTrack.https.html
@@ -298,14 +298,16 @@
     pc2.ontrack = (e) => {
       v.srcObject = new MediaStream([e.track]);
     };
-    const metadataToBeLoaded = new Promise((resolve) => {
-      v.addEventListener('loadedmetadata', () => {
+    const metadataToBeLoadedAndPlaying = new Promise((resolve) => {
+      v.addEventListener('loadedmetadata', async () => {
+        await v.play();
+        // note: calling v.play() is required in some browsers, not all.
         resolve();
       });
     });
     exchangeIceCandidates(pc1, pc2);
     exchangeOfferAnswer(pc1, pc2);
-    await metadataToBeLoaded;
+    await metadataToBeLoadedAndPlaying;
     await detectSignal(t, v, 20);
     await sender.replaceTrack(track2);
     await detectSignal(t, v, 250);
@@ -328,14 +330,16 @@
     pc2.ontrack = (e) => {
       v.srcObject = new MediaStream([e.track]);
     };
-    const metadataToBeLoaded = new Promise((resolve) => {
-      v.addEventListener('loadedmetadata', () => {
+    const metadataToBeLoadedAndPlaying = new Promise((resolve) => {
+      v.addEventListener('loadedmetadata', async () => {
+        await v.play();
+        // note: calling v.play() is required in some browsers, not all.
         resolve();
       });
     });
     exchangeIceCandidates(pc1, pc2);
     exchangeOfferAnswer(pc1, pc2);
-    await metadataToBeLoaded;
+    await metadataToBeLoadedAndPlaying;
     await detectSignal(t, v, 20);
     await sender.replaceTrack(null);
     await sender.replaceTrack(track2);