diff --git a/Source/WebCore/Modules/pictureinpicture/HTMLVideoElementPictureInPicture.cpp b/Source/WebCore/Modules/pictureinpicture/HTMLVideoElementPictureInPicture.cpp
index bbe2cbc8b9cb..07a836b93eb7 100644
--- a/Source/WebCore/Modules/pictureinpicture/HTMLVideoElementPictureInPicture.cpp
+++ b/Source/WebCore/Modules/pictureinpicture/HTMLVideoElementPictureInPicture.cpp
@@ -189,13 +189,7 @@ void HTMLVideoElementPictureInPicture::didExitPictureInPicture()
 
 void HTMLVideoElementPictureInPicture::pictureInPictureWindowResized(const IntSize& windowSize)
 {
-    if (m_pictureInPictureWindow->width() == windowSize.width() && m_pictureInPictureWindow->height() == windowSize.height())
-        return;
-
     m_pictureInPictureWindow->setSize(windowSize);
-    auto resizeEvent = Event::create(eventNames().resizeEvent, Event::CanBubble::Yes, Event::IsCancelable::No);
-    resizeEvent->setTarget(m_pictureInPictureWindow);
-    m_videoElement.scheduleEvent(WTFMove(resizeEvent));
 }
 
 #if !RELEASE_LOG_DISABLED
diff --git a/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.cpp b/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.cpp
index 59781c814e06..7423f2592e71 100644
--- a/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.cpp
+++ b/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.cpp
@@ -29,19 +29,22 @@
 
 #if ENABLE(PICTURE_IN_PICTURE_API)
 
+#include "EventNames.h"
 #include <wtf/IsoMallocInlines.h>
 
 namespace WebCore {
 
 WTF_MAKE_ISO_ALLOCATED_IMPL(PictureInPictureWindow);
 
-Ref<PictureInPictureWindow> PictureInPictureWindow::create(ScriptExecutionContext& scriptExecutionContext)
+Ref<PictureInPictureWindow> PictureInPictureWindow::create(Document& document)
 {
-    return adoptRef(*new PictureInPictureWindow(scriptExecutionContext));
+    auto window = adoptRef(*new PictureInPictureWindow(document));
+    window->suspendIfNeeded();
+    return window;
 }
 
-PictureInPictureWindow::PictureInPictureWindow(ScriptExecutionContext& scriptExecutionContext)
-    : m_scriptExecutionContext(scriptExecutionContext)
+PictureInPictureWindow::PictureInPictureWindow(Document& document)
+    : ActiveDOMObject(document)
 {
 }
 
@@ -49,7 +52,11 @@ PictureInPictureWindow::~PictureInPictureWindow() = default;
 
 void PictureInPictureWindow::setSize(const IntSize& size)
 {
+    if (width() == size.width() && height() == size.height())
+        return;
+    
     m_size = size;
+    queueTaskToDispatchEvent(*this, TaskSource::MediaElement, Event::create(eventNames().resizeEvent, Event::CanBubble::No, Event::IsCancelable::No));
 }
 
 void PictureInPictureWindow::close()
diff --git a/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.h b/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.h
index 226f42d5bfb8..5e5043e5aa28 100644
--- a/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.h
+++ b/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.h
@@ -28,6 +28,7 @@
 
 #if ENABLE(PICTURE_IN_PICTURE_API)
 
+#include "ActiveDOMObject.h"
 #include "EventTarget.h"
 #include "IntSize.h"
 #include <wtf/RefCounted.h>
@@ -35,11 +36,12 @@
 namespace WebCore {
 
 class PictureInPictureWindow final
-    : public RefCounted<PictureInPictureWindow>
-    , public EventTargetWithInlineData {
+    : public ActiveDOMObject
+    , public EventTargetWithInlineData
+    , public RefCounted<PictureInPictureWindow> {
     WTF_MAKE_ISO_ALLOCATED(PictureInPictureWindow);
 public:
-    static Ref<PictureInPictureWindow> create(ScriptExecutionContext&);
+    static Ref<PictureInPictureWindow> create(Document&);
     virtual ~PictureInPictureWindow();
 
     int width() const { return m_size.width(); }
@@ -51,15 +53,17 @@ class PictureInPictureWindow final
     using RefCounted<PictureInPictureWindow>::deref;
 
 private:
-    PictureInPictureWindow(ScriptExecutionContext&);
+    PictureInPictureWindow(Document&);
+        
+    // ActiveDOMObject
+    const char* activeDOMObjectName() const final { return "PictureInPictureWindow"; }
 
     // EventTarget
     void refEventTarget() final { ref(); }
     void derefEventTarget() final { deref(); }
     EventTargetInterface eventTargetInterface() const override { return PictureInPictureWindowEventTargetInterfaceType; };
-    ScriptExecutionContext* scriptExecutionContext() const override { return &m_scriptExecutionContext; };
+    ScriptExecutionContext* scriptExecutionContext() const override { return ActiveDOMObject::scriptExecutionContext(); };
 
-    ScriptExecutionContext& m_scriptExecutionContext;
     IntSize m_size;
 };
 
diff --git a/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.idl b/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.idl
index 8bc0d05fca4d..ac52803acb79 100644
--- a/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.idl
+++ b/Source/WebCore/Modules/pictureinpicture/PictureInPictureWindow.idl
@@ -25,6 +25,7 @@
  */
 
 [
+    ActiveDOMObject,
     Conditional=PICTURE_IN_PICTURE_API,
     EnabledBySetting=PictureInPictureAPIEnabled,
     Exposed=Window