diff --git a/dom/media/mediacontrol/MediaController.cpp b/dom/media/mediacontrol/MediaController.cpp
index f28ec5e406bfeefd624c9538878d423e99b0df6a..afb60df8ddec86c0c83584b8325add8d1c373d0e 100644
--- a/dom/media/mediacontrol/MediaController.cpp
+++ b/dom/media/mediacontrol/MediaController.cpp
@@ -49,6 +49,25 @@ void MediaController::GetSupportedKeys(
   }
 }
 
+void MediaController::GetPositionState(MediaControllerPositionState& aPositionState, ErrorResult& aRv) {
+  if (!IsActive() || mShutdown) {
+    LOG("Cannot get position state: controller is inactive or shut down");
+    aRv.Throw(NS_ERROR_NOT_AVAILABLE);
+    return;
+  }
+
+  Maybe<PositionState> currentPositionState = GetCurrentPositionState();
+  if (!currentPositionState) {
+    LOG("No position state available for controller %" PRId64, Id());
+    aRv.Throw(NS_ERROR_NOT_AVAILABLE);
+    return;
+  }
+
+  aPositionState.mDuration = currentPositionState->mDuration;
+  aPositionState.mPosition = currentPositionState->mLastReportedPlaybackPosition;
+  aPositionState.mPlaybackRate = currentPositionState->mPlaybackRate;
+}
+
 void MediaController::GetMetadata(MediaMetadataInit& aMetadata,
                                   ErrorResult& aRv) {
   if (!IsActive() || mShutdown) {
@@ -435,6 +454,7 @@ void MediaController::SetIsInPictureInPictureMode(
   ForceToBecomeMainControllerIfNeeded();
   UpdateDeactivationTimerIfNeeded();
   mPictureInPictureModeChangedEvent.Notify(mIsInPictureInPictureMode);
+  DispatchAsyncEvent(u"pictureinpicturemodechange"_ns);
 }
 
 void MediaController::NotifyMediaFullScreenState(uint64_t aBrowsingContextId,