diff --git a/.changeset/busy-icons-notice.md b/.changeset/busy-icons-notice.md
new file mode 100644
index 0000000000..a50b1c9b5a
--- /dev/null
+++ b/.changeset/busy-icons-notice.md
@@ -0,0 +1,5 @@
+---
+'livekit-client': patch
+---
+
+Defer `onEnterPiP` visibility update until after the next microtask and animation frame so Document Picture-in-Picture embedders can append DOM into the PiP window before `isElementInPiP` runs.
diff --git a/src/room/track/RemoteVideoTrack.ts b/src/room/track/RemoteVideoTrack.ts
index b3d585db04..d7d1c9436f 100644
--- a/src/room/track/RemoteVideoTrack.ts
+++ b/src/room/track/RemoteVideoTrack.ts
@@ -384,8 +384,14 @@ class HTMLElementInfo implements ElementInfo {
 
   private onEnterPiP = () => {
     window.documentPictureInPicture?.window?.addEventListener('pagehide', this.onLeavePiP);
-    this.isPiP = isElementInPiP(this.element);
-    this.handleVisibilityChanged?.();
+    // Document PiP: the browser may fire 'enter' before the app has appended its subtree into
+    // documentPictureInPicture.window. Defer so pipWin.document.contains(video) is reliable.
+    queueMicrotask(() => {
+      requestAnimationFrame(() => {
+        this.isPiP = isElementInPiP(this.element);
+        this.handleVisibilityChanged?.();
+      });
+    });
   };
 
   private onLeavePiP = () => {