diff --git a/include/capi/views/cef_window_delegate_capi.h b/include/capi/views/cef_window_delegate_capi.h
index ce63b8651..8a6b638cc 100644
--- a/include/capi/views/cef_window_delegate_capi.h
+++ b/include/capi/views/cef_window_delegate_capi.h
@@ -33,7 +33,7 @@
 // by hand. See the translator.README.txt file in the tools directory for
 // more information.
 //
-// $hash=9f0389a439e6787282880d53375369829adb6a3d$
+// $hash=7201d268e16fc89f255b6ccd00d043f34fe77584$
 //
 
 #ifndef CEF_INCLUDE_CAPI_VIEWS_CEF_WINDOW_DELEGATE_CAPI_H_
@@ -139,7 +139,7 @@ typedef struct _cef_window_delegate_t {
 
   ///
   /// Return true (1) if |window| should be created with standard window buttons
-  /// like close, minimize and zoom.
+  /// like close, minimize and zoom. This function is only supported on macOS.
   ///
   int(CEF_CALLBACK* with_standard_window_buttons)(
       struct _cef_window_delegate_t* self,
@@ -198,6 +198,17 @@ typedef struct _cef_window_delegate_t {
   int(CEF_CALLBACK* on_key_event)(struct _cef_window_delegate_t* self,
                                   struct _cef_window_t* window,
                                   const cef_key_event_t* event);
+
+  ///
+  /// Called when the |window| is transitioning to or from fullscreen mode. The
+  /// transition occurs in two stages, with |is_competed| set to false (0) when
+  /// the transition starts and true (1) when the transition completes. This
+  /// function is only supported on macOS.
+  ///
+  void(CEF_CALLBACK* on_window_fullscreen_transition)(
+      struct _cef_window_delegate_t* self,
+      struct _cef_window_t* window,
+      int is_completed);
 } cef_window_delegate_t;
 
 #ifdef __cplusplus
diff --git a/include/cef_api_hash.h b/include/cef_api_hash.h
index 4dc34a191..d4c4348df 100644
--- a/include/cef_api_hash.h
+++ b/include/cef_api_hash.h
@@ -42,13 +42,13 @@
 // way that may cause binary incompatibility with other builds. The universal
 // hash value will change if any platform is affected whereas the platform hash
 // values will change only if that particular platform is affected.
-#define CEF_API_HASH_UNIVERSAL "149694d7fffd78ef85e127229819c69e2189ef32"
+#define CEF_API_HASH_UNIVERSAL "7c7515822b869395898c705bcc350222c26e8734"
 #if defined(OS_WIN)
-#define CEF_API_HASH_PLATFORM "6f31babeb3f7d2723af55fbd32868284694e4015"
+#define CEF_API_HASH_PLATFORM "54e2eed5aee11d5dbd88808a54f3e93a7bc17b0c"
 #elif defined(OS_MAC)
-#define CEF_API_HASH_PLATFORM "ff1bc603897dca8e100a1d4f9391ef4e49db02df"
+#define CEF_API_HASH_PLATFORM "0f491b440d7e9e318146ed06cdeca86972e801c5"
 #elif defined(OS_LINUX)
-#define CEF_API_HASH_PLATFORM "7f1ef8d0456bdcaff80c4e15a9806c603f204455"
+#define CEF_API_HASH_PLATFORM "b5a01a70d1d15078988ca7d694c355503d5b5ad6"
 #endif
 
 #ifdef __cplusplus
diff --git a/include/views/cef_window_delegate.h b/include/views/cef_window_delegate.h
index 90bc7dfb5..8779000ed 100644
--- a/include/views/cef_window_delegate.h
+++ b/include/views/cef_window_delegate.h
@@ -130,7 +130,7 @@ class CefWindowDelegate : public CefPanelDelegate {
 
   ///
   /// Return true if |window| should be created with standard window buttons
-  /// like close, minimize and zoom.
+  /// like close, minimize and zoom. This method is only supported on macOS.
   ///
   /*--cef()--*/
   virtual bool WithStandardWindowButtons(CefRefPtr<CefWindow> window) {
@@ -196,6 +196,16 @@ class CefWindowDelegate : public CefPanelDelegate {
                           const CefKeyEvent& event) {
     return false;
   }
+
+  ///
+  /// Called when the |window| is transitioning to or from fullscreen mode. The
+  /// transition occurs in two stages, with |is_competed| set to false when the
+  /// transition starts and true when the transition completes.
+  /// This method is only supported on macOS.
+  ///
+  /*--cef()--*/
+  virtual void OnWindowFullscreenTransition(CefRefPtr<CefWindow> window,
+                                            bool is_completed) {}
 };
 
 #endif  // CEF_INCLUDE_VIEWS_CEF_WINDOW_DELEGATE_H_
diff --git a/libcef/browser/views/native_widget_mac.h b/libcef/browser/views/native_widget_mac.h
index b47457643..0ac374fd1 100644
--- a/libcef/browser/views/native_widget_mac.h
+++ b/libcef/browser/views/native_widget_mac.h
@@ -30,6 +30,8 @@ class CefNativeWidgetMac : public views::NativeWidgetMac {
 
   void GetWindowFrameTitlebarHeight(bool* override_titlebar_height,
                                     float* titlebar_height) override;
+  void OnWindowFullscreenTransitionStart() override;
+  void OnWindowFullscreenTransitionComplete() override;
 
  private:
   const CefRefPtr<CefWindow> window_;
diff --git a/libcef/browser/views/native_widget_mac.mm b/libcef/browser/views/native_widget_mac.mm
index b722c3731..864e4f75d 100644
--- a/libcef/browser/views/native_widget_mac.mm
+++ b/libcef/browser/views/native_widget_mac.mm
@@ -52,3 +52,13 @@ void CefNativeWidgetMac::GetWindowFrameTitlebarHeight(
         override_titlebar_height, titlebar_height);
   }
 }
+
+void CefNativeWidgetMac::OnWindowFullscreenTransitionStart() {
+  views::NativeWidgetMac::OnWindowFullscreenTransitionStart();
+  window_delegate_->OnWindowFullscreenTransition(window_, false);
+}
+
+void CefNativeWidgetMac::OnWindowFullscreenTransitionComplete() {
+  views::NativeWidgetMac::OnWindowFullscreenTransitionComplete();
+  window_delegate_->OnWindowFullscreenTransition(window_, true);
+}
diff --git a/libcef_dll/cpptoc/views/window_delegate_cpptoc.cc b/libcef_dll/cpptoc/views/window_delegate_cpptoc.cc
index 64c799e33..9a0431271 100644
--- a/libcef_dll/cpptoc/views/window_delegate_cpptoc.cc
+++ b/libcef_dll/cpptoc/views/window_delegate_cpptoc.cc
@@ -9,7 +9,7 @@
 // implementations. See the translator.README.txt file in the tools directory
 // for more information.
 //
-// $hash=18f715de465689a4e8484bbced8ad92d9434438a$
+// $hash=c7e5e137df27a4986c13e6f4e2b98eac19a48193$
 //
 
 #include "libcef_dll/cpptoc/views/window_delegate_cpptoc.h"
@@ -484,6 +484,29 @@ window_delegate_on_key_event(struct _cef_window_delegate_t* self,
   return _retval;
 }
 
+void CEF_CALLBACK window_delegate_on_window_fullscreen_transition(
+    struct _cef_window_delegate_t* self,
+    cef_window_t* window,
+    int is_completed) {
+  shutdown_checker::AssertNotShutdown();
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  DCHECK(self);
+  if (!self) {
+    return;
+  }
+  // Verify param: window; type: refptr_diff
+  DCHECK(window);
+  if (!window) {
+    return;
+  }
+
+  // Execute
+  CefWindowDelegateCppToC::Get(self)->OnWindowFullscreenTransition(
+      CefWindowCToCpp::Wrap(window), is_completed ? true : false);
+}
+
 cef_size_t CEF_CALLBACK
 window_delegate_get_preferred_size(struct _cef_view_delegate_t* self,
                                    cef_view_t* view) {
@@ -770,6 +793,8 @@ CefWindowDelegateCppToC::CefWindowDelegateCppToC() {
   GetStruct()->can_close = window_delegate_can_close;
   GetStruct()->on_accelerator = window_delegate_on_accelerator;
   GetStruct()->on_key_event = window_delegate_on_key_event;
+  GetStruct()->on_window_fullscreen_transition =
+      window_delegate_on_window_fullscreen_transition;
   GetStruct()->base.base.get_preferred_size =
       window_delegate_get_preferred_size;
   GetStruct()->base.base.get_minimum_size = window_delegate_get_minimum_size;
diff --git a/libcef_dll/ctocpp/views/window_delegate_ctocpp.cc b/libcef_dll/ctocpp/views/window_delegate_ctocpp.cc
index 206d9532a..1ca2a16de 100644
--- a/libcef_dll/ctocpp/views/window_delegate_ctocpp.cc
+++ b/libcef_dll/ctocpp/views/window_delegate_ctocpp.cc
@@ -9,7 +9,7 @@
 // implementations. See the translator.README.txt file in the tools directory
 // for more information.
 //
-// $hash=40aea12873a3c8803c9d2d6c06a0270197ead58e$
+// $hash=5d3fd8439bbc051bac61497b125a7ac35859881d$
 //
 
 #include "libcef_dll/ctocpp/views/window_delegate_ctocpp.h"
@@ -462,6 +462,30 @@ bool CefWindowDelegateCToCpp::OnKeyEvent(CefRefPtr<CefWindow> window,
   return _retval ? true : false;
 }
 
+NO_SANITIZE("cfi-icall")
+void CefWindowDelegateCToCpp::OnWindowFullscreenTransition(
+    CefRefPtr<CefWindow> window,
+    bool is_completed) {
+  shutdown_checker::AssertNotShutdown();
+
+  cef_window_delegate_t* _struct = GetStruct();
+  if (CEF_MEMBER_MISSING(_struct, on_window_fullscreen_transition)) {
+    return;
+  }
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  // Verify param: window; type: refptr_diff
+  DCHECK(window.get());
+  if (!window.get()) {
+    return;
+  }
+
+  // Execute
+  _struct->on_window_fullscreen_transition(
+      _struct, CefWindowCppToC::Wrap(window), is_completed);
+}
+
 NO_SANITIZE("cfi-icall")
 CefSize CefWindowDelegateCToCpp::GetPreferredSize(CefRefPtr<CefView> view) {
   shutdown_checker::AssertNotShutdown();
diff --git a/libcef_dll/ctocpp/views/window_delegate_ctocpp.h b/libcef_dll/ctocpp/views/window_delegate_ctocpp.h
index def8dd49c..cbcf5530c 100644
--- a/libcef_dll/ctocpp/views/window_delegate_ctocpp.h
+++ b/libcef_dll/ctocpp/views/window_delegate_ctocpp.h
@@ -9,7 +9,7 @@
 // implementations. See the translator.README.txt file in the tools directory
 // for more information.
 //
-// $hash=d100d8866a7eab2a163d4ddb3cacd00141f65757$
+// $hash=bf87c473a5bafd3f8c30bd06c033b0182f65a7b7$
 //
 
 #ifndef CEF_LIBCEF_DLL_CTOCPP_VIEWS_WINDOW_DELEGATE_CTOCPP_H_
@@ -60,6 +60,8 @@ class CefWindowDelegateCToCpp
   bool OnAccelerator(CefRefPtr<CefWindow> window, int command_id) override;
   bool OnKeyEvent(CefRefPtr<CefWindow> window,
                   const CefKeyEvent& event) override;
+  void OnWindowFullscreenTransition(CefRefPtr<CefWindow> window,
+                                    bool is_completed) override;
 
   // CefPanelDelegate methods.