diff --git a/compiled/facebook-www/JSXDEVRuntime-dev.classic.js b/compiled/facebook-www/JSXDEVRuntime-dev.classic.js
index c0e3d098933f4..491836021645f 100644
--- a/compiled/facebook-www/JSXDEVRuntime-dev.classic.js
+++ b/compiled/facebook-www/JSXDEVRuntime-dev.classic.js
@@ -109,7 +109,8 @@ if (__DEV__) {
 
     var enableDebugTracing = dynamicFeatureFlags.enableDebugTracing,
       enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, false is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, false is used for a new modern build.
 
     var REACT_CLIENT_REFERENCE$2 = Symbol.for("react.client.reference");
     function isValidElementType(type) {
diff --git a/compiled/facebook-www/JSXDEVRuntime-dev.modern.js b/compiled/facebook-www/JSXDEVRuntime-dev.modern.js
index 503aac031a553..07616147ff588 100644
--- a/compiled/facebook-www/JSXDEVRuntime-dev.modern.js
+++ b/compiled/facebook-www/JSXDEVRuntime-dev.modern.js
@@ -109,7 +109,8 @@ if (__DEV__) {
 
     var enableDebugTracing = dynamicFeatureFlags.enableDebugTracing,
       enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, true is used for a new modern build.
 
     var REACT_CLIENT_REFERENCE$2 = Symbol.for("react.client.reference");
     function isValidElementType(type) {
diff --git a/compiled/facebook-www/REVISION b/compiled/facebook-www/REVISION
index 46448add900e4..7666a749e2944 100644
--- a/compiled/facebook-www/REVISION
+++ b/compiled/facebook-www/REVISION
@@ -1 +1 @@
-a9cc32511a12c261ee719e5383818182800d6af4
+ef72271c2d1234c9d1e1358f8083021089a50faa
diff --git a/compiled/facebook-www/React-dev.classic.js b/compiled/facebook-www/React-dev.classic.js
index e9acdabb31e1b..1973cea364b9c 100644
--- a/compiled/facebook-www/React-dev.classic.js
+++ b/compiled/facebook-www/React-dev.classic.js
@@ -24,7 +24,7 @@ if (__DEV__) {
     ) {
       __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());
     }
-    var ReactVersion = "18.3.0-www-classic-77843590";
+    var ReactVersion = "18.3.0-www-classic-435f93e8";
 
     // ATTENTION
     // When adding new symbols to this file,
@@ -475,7 +475,8 @@ if (__DEV__) {
 
     var enableDebugTracing = dynamicFeatureFlags.enableDebugTracing,
       enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, false is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, false is used for a new modern build.
 
     function getWrappedName(outerType, innerType, wrapperName) {
       var displayName = outerType.displayName;
diff --git a/compiled/facebook-www/React-dev.modern.js b/compiled/facebook-www/React-dev.modern.js
index bd1deb63debda..902f8cb2501c0 100644
--- a/compiled/facebook-www/React-dev.modern.js
+++ b/compiled/facebook-www/React-dev.modern.js
@@ -24,7 +24,7 @@ if (__DEV__) {
     ) {
       __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());
     }
-    var ReactVersion = "18.3.0-www-modern-0bb55f38";
+    var ReactVersion = "18.3.0-www-modern-d64ea480";
 
     // ATTENTION
     // When adding new symbols to this file,
@@ -475,7 +475,8 @@ if (__DEV__) {
 
     var enableDebugTracing = dynamicFeatureFlags.enableDebugTracing,
       enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, true is used for a new modern build.
 
     function getWrappedName(outerType, innerType, wrapperName) {
       var displayName = outerType.displayName;
diff --git a/compiled/facebook-www/React-prod.classic.js b/compiled/facebook-www/React-prod.classic.js
index 507eac9565b79..1ad6d3c9ac720 100644
--- a/compiled/facebook-www/React-prod.classic.js
+++ b/compiled/facebook-www/React-prod.classic.js
@@ -618,4 +618,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactCurrentDispatcher.current.useTransition();
 };
-exports.version = "18.3.0-www-classic-707cd731";
+exports.version = "18.3.0-www-classic-863536b2";
diff --git a/compiled/facebook-www/React-prod.modern.js b/compiled/facebook-www/React-prod.modern.js
index f0c20a0e84960..81d75b6c69f87 100644
--- a/compiled/facebook-www/React-prod.modern.js
+++ b/compiled/facebook-www/React-prod.modern.js
@@ -610,4 +610,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactCurrentDispatcher.current.useTransition();
 };
-exports.version = "18.3.0-www-modern-f4321f8c";
+exports.version = "18.3.0-www-modern-19268851";
diff --git a/compiled/facebook-www/ReactART-dev.classic.js b/compiled/facebook-www/ReactART-dev.classic.js
index cfc6ae78ef64f..018f8e9d7a9c5 100644
--- a/compiled/facebook-www/ReactART-dev.classic.js
+++ b/compiled/facebook-www/ReactART-dev.classic.js
@@ -66,7 +66,7 @@ if (__DEV__) {
       return self;
     }
 
-    var ReactVersion = "18.3.0-www-classic-fc548c7d";
+    var ReactVersion = "18.3.0-www-classic-162b9b5d";
 
     var LegacyRoot = 0;
     var ConcurrentRoot = 1;
@@ -187,7 +187,8 @@ if (__DEV__) {
         dynamicFeatureFlags.transitionLaneExpirationMs,
       enableInfiniteRenderLoopDetection =
         dynamicFeatureFlags.enableInfiniteRenderLoopDetection,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, false is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext,
+      useModernStrictMode = dynamicFeatureFlags.useModernStrictMode; // On WWW, false is used for a new modern build.
     var enableProfilerTimer = true;
     var enableProfilerCommitHooks = true;
     var enableProfilerNestedUpdatePhase = true;
@@ -28106,9 +28107,121 @@ if (__DEV__) {
       }
     }
 
+    function recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+      root,
+      parentFiber,
+      isInStrictMode
+    ) {
+      if (
+        (parentFiber.subtreeFlags & (PlacementDEV | Visibility)) ===
+        NoFlags$1
+      ) {
+        // Parent's descendants have already had effects double invoked.
+        // Early exit to avoid unnecessary tree traversal.
+        return;
+      }
+
+      var child = parentFiber.child;
+
+      while (child !== null) {
+        doubleInvokeEffectsInDEVIfNecessary(root, child, isInStrictMode);
+        child = child.sibling;
+      }
+    } // Unconditionally disconnects and connects passive and layout effects.
+
+    function doubleInvokeEffectsOnFiber(root, fiber) {
+      var shouldDoubleInvokePassiveEffects =
+        arguments.length > 2 && arguments[2] !== undefined
+          ? arguments[2]
+          : true;
+      disappearLayoutEffects(fiber);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        disconnectPassiveEffect(fiber);
+      }
+
+      reappearLayoutEffects(root, fiber.alternate, fiber, false);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        reconnectPassiveEffects(root, fiber, NoLanes, null, false);
+      }
+    }
+
+    function doubleInvokeEffectsInDEVIfNecessary(
+      root,
+      fiber,
+      parentIsInStrictMode
+    ) {
+      var isStrictModeFiber = fiber.type === REACT_STRICT_MODE_TYPE;
+      var isInStrictMode = parentIsInStrictMode || isStrictModeFiber; // First case: the fiber **is not** of type OffscreenComponent. No
+      // special rules apply to double invoking effects.
+
+      if (fiber.tag !== OffscreenComponent) {
+        if (fiber.flags & PlacementDEV) {
+          setCurrentFiber(fiber);
+
+          if (isInStrictMode) {
+            doubleInvokeEffectsOnFiber(
+              root,
+              fiber,
+              (fiber.mode & NoStrictPassiveEffectsMode) === NoMode
+            );
+          }
+
+          resetCurrentFiber();
+        } else {
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        return;
+      } // Second case: the fiber **is** of type OffscreenComponent.
+      // This branch contains cases specific to Offscreen.
+
+      if (fiber.memoizedState === null) {
+        // Only consider Offscreen that is visible.
+        // TODO (Offscreen) Handle manual mode.
+        setCurrentFiber(fiber);
+
+        if (isInStrictMode && fiber.flags & Visibility) {
+          // Double invoke effects on Offscreen's subtree only
+          // if it is visible and its visibility has changed.
+          doubleInvokeEffectsOnFiber(root, fiber);
+        } else if (fiber.subtreeFlags & PlacementDEV) {
+          // Something in the subtree could have been suspended.
+          // We need to continue traversal and find newly inserted fibers.
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        resetCurrentFiber();
+      }
+    }
+
     function commitDoubleInvokeEffectsInDEV(root, hasPassiveEffects) {
       {
-        {
+        if (useModernStrictMode && root.tag !== LegacyRoot) {
+          var doubleInvokeEffects = true;
+
+          if (
+            root.tag === ConcurrentRoot &&
+            !(root.current.mode & (StrictLegacyMode | StrictEffectsMode))
+          ) {
+            doubleInvokeEffects = false;
+          }
+
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            root.current,
+            doubleInvokeEffects
+          );
+        } else {
           legacyCommitDoubleInvokeEffectsInDEV(root.current, hasPassiveEffects);
         }
       }
diff --git a/compiled/facebook-www/ReactART-dev.modern.js b/compiled/facebook-www/ReactART-dev.modern.js
index 1eb931734066f..777fbd9f29487 100644
--- a/compiled/facebook-www/ReactART-dev.modern.js
+++ b/compiled/facebook-www/ReactART-dev.modern.js
@@ -66,7 +66,7 @@ if (__DEV__) {
       return self;
     }
 
-    var ReactVersion = "18.3.0-www-modern-cdfb5e55";
+    var ReactVersion = "18.3.0-www-modern-4bc0b3fd";
 
     var LegacyRoot = 0;
     var ConcurrentRoot = 1;
@@ -187,7 +187,8 @@ if (__DEV__) {
         dynamicFeatureFlags.transitionLaneExpirationMs,
       enableInfiniteRenderLoopDetection =
         dynamicFeatureFlags.enableInfiniteRenderLoopDetection,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext,
+      useModernStrictMode = dynamicFeatureFlags.useModernStrictMode; // On WWW, true is used for a new modern build.
     var enableProfilerTimer = true;
     var enableProfilerCommitHooks = true;
     var enableProfilerNestedUpdatePhase = true;
@@ -27756,9 +27757,121 @@ if (__DEV__) {
       }
     }
 
+    function recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+      root,
+      parentFiber,
+      isInStrictMode
+    ) {
+      if (
+        (parentFiber.subtreeFlags & (PlacementDEV | Visibility)) ===
+        NoFlags$1
+      ) {
+        // Parent's descendants have already had effects double invoked.
+        // Early exit to avoid unnecessary tree traversal.
+        return;
+      }
+
+      var child = parentFiber.child;
+
+      while (child !== null) {
+        doubleInvokeEffectsInDEVIfNecessary(root, child, isInStrictMode);
+        child = child.sibling;
+      }
+    } // Unconditionally disconnects and connects passive and layout effects.
+
+    function doubleInvokeEffectsOnFiber(root, fiber) {
+      var shouldDoubleInvokePassiveEffects =
+        arguments.length > 2 && arguments[2] !== undefined
+          ? arguments[2]
+          : true;
+      disappearLayoutEffects(fiber);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        disconnectPassiveEffect(fiber);
+      }
+
+      reappearLayoutEffects(root, fiber.alternate, fiber, false);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        reconnectPassiveEffects(root, fiber, NoLanes, null, false);
+      }
+    }
+
+    function doubleInvokeEffectsInDEVIfNecessary(
+      root,
+      fiber,
+      parentIsInStrictMode
+    ) {
+      var isStrictModeFiber = fiber.type === REACT_STRICT_MODE_TYPE;
+      var isInStrictMode = parentIsInStrictMode || isStrictModeFiber; // First case: the fiber **is not** of type OffscreenComponent. No
+      // special rules apply to double invoking effects.
+
+      if (fiber.tag !== OffscreenComponent) {
+        if (fiber.flags & PlacementDEV) {
+          setCurrentFiber(fiber);
+
+          if (isInStrictMode) {
+            doubleInvokeEffectsOnFiber(
+              root,
+              fiber,
+              (fiber.mode & NoStrictPassiveEffectsMode) === NoMode
+            );
+          }
+
+          resetCurrentFiber();
+        } else {
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        return;
+      } // Second case: the fiber **is** of type OffscreenComponent.
+      // This branch contains cases specific to Offscreen.
+
+      if (fiber.memoizedState === null) {
+        // Only consider Offscreen that is visible.
+        // TODO (Offscreen) Handle manual mode.
+        setCurrentFiber(fiber);
+
+        if (isInStrictMode && fiber.flags & Visibility) {
+          // Double invoke effects on Offscreen's subtree only
+          // if it is visible and its visibility has changed.
+          doubleInvokeEffectsOnFiber(root, fiber);
+        } else if (fiber.subtreeFlags & PlacementDEV) {
+          // Something in the subtree could have been suspended.
+          // We need to continue traversal and find newly inserted fibers.
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        resetCurrentFiber();
+      }
+    }
+
     function commitDoubleInvokeEffectsInDEV(root, hasPassiveEffects) {
       {
-        {
+        if (useModernStrictMode && root.tag !== LegacyRoot) {
+          var doubleInvokeEffects = true;
+
+          if (
+            root.tag === ConcurrentRoot &&
+            !(root.current.mode & (StrictLegacyMode | StrictEffectsMode))
+          ) {
+            doubleInvokeEffects = false;
+          }
+
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            root.current,
+            doubleInvokeEffects
+          );
+        } else {
           legacyCommitDoubleInvokeEffectsInDEV(root.current, hasPassiveEffects);
         }
       }
diff --git a/compiled/facebook-www/ReactDOM-dev.classic.js b/compiled/facebook-www/ReactDOM-dev.classic.js
index ace995c85be2f..e30d52e0aa637 100644
--- a/compiled/facebook-www/ReactDOM-dev.classic.js
+++ b/compiled/facebook-www/ReactDOM-dev.classic.js
@@ -152,7 +152,8 @@ if (__DEV__) {
         dynamicFeatureFlags.transitionLaneExpirationMs,
       enableInfiniteRenderLoopDetection =
         dynamicFeatureFlags.enableInfiniteRenderLoopDetection,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, false is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext,
+      useModernStrictMode = dynamicFeatureFlags.useModernStrictMode; // On WWW, false is used for a new modern build.
     var enableProfilerTimer = true;
     var enableProfilerCommitHooks = true;
     var enableProfilerNestedUpdatePhase = true;
@@ -33982,9 +33983,121 @@ if (__DEV__) {
       }
     }
 
+    function recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+      root,
+      parentFiber,
+      isInStrictMode
+    ) {
+      if (
+        (parentFiber.subtreeFlags & (PlacementDEV | Visibility)) ===
+        NoFlags$1
+      ) {
+        // Parent's descendants have already had effects double invoked.
+        // Early exit to avoid unnecessary tree traversal.
+        return;
+      }
+
+      var child = parentFiber.child;
+
+      while (child !== null) {
+        doubleInvokeEffectsInDEVIfNecessary(root, child, isInStrictMode);
+        child = child.sibling;
+      }
+    } // Unconditionally disconnects and connects passive and layout effects.
+
+    function doubleInvokeEffectsOnFiber(root, fiber) {
+      var shouldDoubleInvokePassiveEffects =
+        arguments.length > 2 && arguments[2] !== undefined
+          ? arguments[2]
+          : true;
+      disappearLayoutEffects(fiber);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        disconnectPassiveEffect(fiber);
+      }
+
+      reappearLayoutEffects(root, fiber.alternate, fiber, false);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        reconnectPassiveEffects(root, fiber, NoLanes, null, false);
+      }
+    }
+
+    function doubleInvokeEffectsInDEVIfNecessary(
+      root,
+      fiber,
+      parentIsInStrictMode
+    ) {
+      var isStrictModeFiber = fiber.type === REACT_STRICT_MODE_TYPE;
+      var isInStrictMode = parentIsInStrictMode || isStrictModeFiber; // First case: the fiber **is not** of type OffscreenComponent. No
+      // special rules apply to double invoking effects.
+
+      if (fiber.tag !== OffscreenComponent) {
+        if (fiber.flags & PlacementDEV) {
+          setCurrentFiber(fiber);
+
+          if (isInStrictMode) {
+            doubleInvokeEffectsOnFiber(
+              root,
+              fiber,
+              (fiber.mode & NoStrictPassiveEffectsMode) === NoMode
+            );
+          }
+
+          resetCurrentFiber();
+        } else {
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        return;
+      } // Second case: the fiber **is** of type OffscreenComponent.
+      // This branch contains cases specific to Offscreen.
+
+      if (fiber.memoizedState === null) {
+        // Only consider Offscreen that is visible.
+        // TODO (Offscreen) Handle manual mode.
+        setCurrentFiber(fiber);
+
+        if (isInStrictMode && fiber.flags & Visibility) {
+          // Double invoke effects on Offscreen's subtree only
+          // if it is visible and its visibility has changed.
+          doubleInvokeEffectsOnFiber(root, fiber);
+        } else if (fiber.subtreeFlags & PlacementDEV) {
+          // Something in the subtree could have been suspended.
+          // We need to continue traversal and find newly inserted fibers.
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        resetCurrentFiber();
+      }
+    }
+
     function commitDoubleInvokeEffectsInDEV(root, hasPassiveEffects) {
       {
-        {
+        if (useModernStrictMode && root.tag !== LegacyRoot) {
+          var doubleInvokeEffects = true;
+
+          if (
+            root.tag === ConcurrentRoot &&
+            !(root.current.mode & (StrictLegacyMode | StrictEffectsMode))
+          ) {
+            doubleInvokeEffects = false;
+          }
+
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            root.current,
+            doubleInvokeEffects
+          );
+        } else {
           legacyCommitDoubleInvokeEffectsInDEV(root.current, hasPassiveEffects);
         }
       }
@@ -35723,7 +35836,7 @@ if (__DEV__) {
       return root;
     }
 
-    var ReactVersion = "18.3.0-www-classic-356e851e";
+    var ReactVersion = "18.3.0-www-classic-4bb1faa4";
 
     function createPortal$1(
       children,
diff --git a/compiled/facebook-www/ReactDOM-dev.modern.js b/compiled/facebook-www/ReactDOM-dev.modern.js
index f763ab49636ff..a7a70c994a6bc 100644
--- a/compiled/facebook-www/ReactDOM-dev.modern.js
+++ b/compiled/facebook-www/ReactDOM-dev.modern.js
@@ -138,7 +138,8 @@ if (__DEV__) {
         dynamicFeatureFlags.transitionLaneExpirationMs,
       enableInfiniteRenderLoopDetection =
         dynamicFeatureFlags.enableInfiniteRenderLoopDetection,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext,
+      useModernStrictMode = dynamicFeatureFlags.useModernStrictMode; // On WWW, true is used for a new modern build.
     var enableProfilerTimer = true;
     var enableProfilerCommitHooks = true;
     var enableProfilerNestedUpdatePhase = true;
@@ -33818,9 +33819,121 @@ if (__DEV__) {
       }
     }
 
+    function recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+      root,
+      parentFiber,
+      isInStrictMode
+    ) {
+      if (
+        (parentFiber.subtreeFlags & (PlacementDEV | Visibility)) ===
+        NoFlags$1
+      ) {
+        // Parent's descendants have already had effects double invoked.
+        // Early exit to avoid unnecessary tree traversal.
+        return;
+      }
+
+      var child = parentFiber.child;
+
+      while (child !== null) {
+        doubleInvokeEffectsInDEVIfNecessary(root, child, isInStrictMode);
+        child = child.sibling;
+      }
+    } // Unconditionally disconnects and connects passive and layout effects.
+
+    function doubleInvokeEffectsOnFiber(root, fiber) {
+      var shouldDoubleInvokePassiveEffects =
+        arguments.length > 2 && arguments[2] !== undefined
+          ? arguments[2]
+          : true;
+      disappearLayoutEffects(fiber);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        disconnectPassiveEffect(fiber);
+      }
+
+      reappearLayoutEffects(root, fiber.alternate, fiber, false);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        reconnectPassiveEffects(root, fiber, NoLanes, null, false);
+      }
+    }
+
+    function doubleInvokeEffectsInDEVIfNecessary(
+      root,
+      fiber,
+      parentIsInStrictMode
+    ) {
+      var isStrictModeFiber = fiber.type === REACT_STRICT_MODE_TYPE;
+      var isInStrictMode = parentIsInStrictMode || isStrictModeFiber; // First case: the fiber **is not** of type OffscreenComponent. No
+      // special rules apply to double invoking effects.
+
+      if (fiber.tag !== OffscreenComponent) {
+        if (fiber.flags & PlacementDEV) {
+          setCurrentFiber(fiber);
+
+          if (isInStrictMode) {
+            doubleInvokeEffectsOnFiber(
+              root,
+              fiber,
+              (fiber.mode & NoStrictPassiveEffectsMode) === NoMode
+            );
+          }
+
+          resetCurrentFiber();
+        } else {
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        return;
+      } // Second case: the fiber **is** of type OffscreenComponent.
+      // This branch contains cases specific to Offscreen.
+
+      if (fiber.memoizedState === null) {
+        // Only consider Offscreen that is visible.
+        // TODO (Offscreen) Handle manual mode.
+        setCurrentFiber(fiber);
+
+        if (isInStrictMode && fiber.flags & Visibility) {
+          // Double invoke effects on Offscreen's subtree only
+          // if it is visible and its visibility has changed.
+          doubleInvokeEffectsOnFiber(root, fiber);
+        } else if (fiber.subtreeFlags & PlacementDEV) {
+          // Something in the subtree could have been suspended.
+          // We need to continue traversal and find newly inserted fibers.
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        resetCurrentFiber();
+      }
+    }
+
     function commitDoubleInvokeEffectsInDEV(root, hasPassiveEffects) {
       {
-        {
+        if (useModernStrictMode && root.tag !== LegacyRoot) {
+          var doubleInvokeEffects = true;
+
+          if (
+            root.tag === ConcurrentRoot &&
+            !(root.current.mode & (StrictLegacyMode | StrictEffectsMode))
+          ) {
+            doubleInvokeEffects = false;
+          }
+
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            root.current,
+            doubleInvokeEffects
+          );
+        } else {
           legacyCommitDoubleInvokeEffectsInDEV(root.current, hasPassiveEffects);
         }
       }
@@ -35559,7 +35672,7 @@ if (__DEV__) {
       return root;
     }
 
-    var ReactVersion = "18.3.0-www-modern-89b71e92";
+    var ReactVersion = "18.3.0-www-modern-5bb6a208";
 
     function createPortal$1(
       children,
diff --git a/compiled/facebook-www/ReactDOM-profiling.modern.js b/compiled/facebook-www/ReactDOM-profiling.modern.js
index 82c73ea51bdea..8bcccde80118b 100644
--- a/compiled/facebook-www/ReactDOM-profiling.modern.js
+++ b/compiled/facebook-www/ReactDOM-profiling.modern.js
@@ -17458,7 +17458,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1863 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-modern-cdfb5e55",
+  version: "18.3.0-www-modern-4bc0b3fd",
   rendererPackageName: "react-dom"
 };
 (function (internals) {
@@ -17503,7 +17503,7 @@ var devToolsConfig$jscomp$inline_1863 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-www-modern-cdfb5e55"
+  reconcilerVersion: "18.3.0-www-modern-4bc0b3fd"
 });
 exports.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED = Internals;
 exports.createPortal = function (children, container) {
@@ -17761,7 +17761,7 @@ exports.useFormState = function (action, initialState, permalink) {
 exports.useFormStatus = function () {
   return ReactCurrentDispatcher$2.current.useHostTransitionStatus();
 };
-exports.version = "18.3.0-www-modern-cdfb5e55";
+exports.version = "18.3.0-www-modern-4bc0b3fd";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&
diff --git a/compiled/facebook-www/ReactDOMServer-dev.classic.js b/compiled/facebook-www/ReactDOMServer-dev.classic.js
index 76ed394fc35e2..e57bc635351cd 100644
--- a/compiled/facebook-www/ReactDOMServer-dev.classic.js
+++ b/compiled/facebook-www/ReactDOMServer-dev.classic.js
@@ -19,7 +19,7 @@ if (__DEV__) {
     var React = require("react");
     var ReactDOM = require("react-dom");
 
-    var ReactVersion = "18.3.0-www-classic-1211dccf";
+    var ReactVersion = "18.3.0-www-classic-593936b0";
 
     // This refers to a WWW module.
     var warningWWW = require("warning");
@@ -88,7 +88,8 @@ if (__DEV__) {
     var enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
       enableUseDeferredValueInitialArg =
         dynamicFeatureFlags.enableUseDeferredValueInitialArg,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, false is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, false is used for a new modern build.
     var enableFloat = true;
 
     // ATTENTION
diff --git a/compiled/facebook-www/ReactDOMServer-dev.modern.js b/compiled/facebook-www/ReactDOMServer-dev.modern.js
index 0fef6195f9158..dfa29bd621148 100644
--- a/compiled/facebook-www/ReactDOMServer-dev.modern.js
+++ b/compiled/facebook-www/ReactDOMServer-dev.modern.js
@@ -19,7 +19,7 @@ if (__DEV__) {
     var React = require("react");
     var ReactDOM = require("react-dom");
 
-    var ReactVersion = "18.3.0-www-modern-ba9c385a";
+    var ReactVersion = "18.3.0-www-modern-320b188c";
 
     // This refers to a WWW module.
     var warningWWW = require("warning");
@@ -88,7 +88,8 @@ if (__DEV__) {
     var enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
       enableUseDeferredValueInitialArg =
         dynamicFeatureFlags.enableUseDeferredValueInitialArg,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, true is used for a new modern build.
     var enableFloat = true;
 
     // ATTENTION
diff --git a/compiled/facebook-www/ReactDOMServerStreaming-dev.modern.js b/compiled/facebook-www/ReactDOMServerStreaming-dev.modern.js
index e10b4fbee4edd..2f6d98b6376f6 100644
--- a/compiled/facebook-www/ReactDOMServerStreaming-dev.modern.js
+++ b/compiled/facebook-www/ReactDOMServerStreaming-dev.modern.js
@@ -86,7 +86,8 @@ if (__DEV__) {
     var enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
       enableUseDeferredValueInitialArg =
         dynamicFeatureFlags.enableUseDeferredValueInitialArg,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, true is used for a new modern build.
     var enableFloat = true;
 
     // ATTENTION
diff --git a/compiled/facebook-www/ReactDOMTesting-dev.classic.js b/compiled/facebook-www/ReactDOMTesting-dev.classic.js
index 84b62d399f354..3c0c8140c5b89 100644
--- a/compiled/facebook-www/ReactDOMTesting-dev.classic.js
+++ b/compiled/facebook-www/ReactDOMTesting-dev.classic.js
@@ -144,7 +144,8 @@ if (__DEV__) {
         dynamicFeatureFlags.transitionLaneExpirationMs,
       enableInfiniteRenderLoopDetection =
         dynamicFeatureFlags.enableInfiniteRenderLoopDetection,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, false is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext,
+      useModernStrictMode = dynamicFeatureFlags.useModernStrictMode; // On WWW, false is used for a new modern build.
     var enableProfilerTimer = true;
     var enableProfilerCommitHooks = true;
     var enableProfilerNestedUpdatePhase = true;
@@ -34606,9 +34607,121 @@ if (__DEV__) {
       }
     }
 
+    function recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+      root,
+      parentFiber,
+      isInStrictMode
+    ) {
+      if (
+        (parentFiber.subtreeFlags & (PlacementDEV | Visibility)) ===
+        NoFlags$1
+      ) {
+        // Parent's descendants have already had effects double invoked.
+        // Early exit to avoid unnecessary tree traversal.
+        return;
+      }
+
+      var child = parentFiber.child;
+
+      while (child !== null) {
+        doubleInvokeEffectsInDEVIfNecessary(root, child, isInStrictMode);
+        child = child.sibling;
+      }
+    } // Unconditionally disconnects and connects passive and layout effects.
+
+    function doubleInvokeEffectsOnFiber(root, fiber) {
+      var shouldDoubleInvokePassiveEffects =
+        arguments.length > 2 && arguments[2] !== undefined
+          ? arguments[2]
+          : true;
+      disappearLayoutEffects(fiber);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        disconnectPassiveEffect(fiber);
+      }
+
+      reappearLayoutEffects(root, fiber.alternate, fiber, false);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        reconnectPassiveEffects(root, fiber, NoLanes, null, false);
+      }
+    }
+
+    function doubleInvokeEffectsInDEVIfNecessary(
+      root,
+      fiber,
+      parentIsInStrictMode
+    ) {
+      var isStrictModeFiber = fiber.type === REACT_STRICT_MODE_TYPE;
+      var isInStrictMode = parentIsInStrictMode || isStrictModeFiber; // First case: the fiber **is not** of type OffscreenComponent. No
+      // special rules apply to double invoking effects.
+
+      if (fiber.tag !== OffscreenComponent) {
+        if (fiber.flags & PlacementDEV) {
+          setCurrentFiber(fiber);
+
+          if (isInStrictMode) {
+            doubleInvokeEffectsOnFiber(
+              root,
+              fiber,
+              (fiber.mode & NoStrictPassiveEffectsMode) === NoMode
+            );
+          }
+
+          resetCurrentFiber();
+        } else {
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        return;
+      } // Second case: the fiber **is** of type OffscreenComponent.
+      // This branch contains cases specific to Offscreen.
+
+      if (fiber.memoizedState === null) {
+        // Only consider Offscreen that is visible.
+        // TODO (Offscreen) Handle manual mode.
+        setCurrentFiber(fiber);
+
+        if (isInStrictMode && fiber.flags & Visibility) {
+          // Double invoke effects on Offscreen's subtree only
+          // if it is visible and its visibility has changed.
+          doubleInvokeEffectsOnFiber(root, fiber);
+        } else if (fiber.subtreeFlags & PlacementDEV) {
+          // Something in the subtree could have been suspended.
+          // We need to continue traversal and find newly inserted fibers.
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        resetCurrentFiber();
+      }
+    }
+
     function commitDoubleInvokeEffectsInDEV(root, hasPassiveEffects) {
       {
-        {
+        if (useModernStrictMode && root.tag !== LegacyRoot) {
+          var doubleInvokeEffects = true;
+
+          if (
+            root.tag === ConcurrentRoot &&
+            !(root.current.mode & (StrictLegacyMode | StrictEffectsMode))
+          ) {
+            doubleInvokeEffects = false;
+          }
+
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            root.current,
+            doubleInvokeEffects
+          );
+        } else {
           legacyCommitDoubleInvokeEffectsInDEV(root.current, hasPassiveEffects);
         }
       }
@@ -36347,7 +36460,7 @@ if (__DEV__) {
       return root;
     }
 
-    var ReactVersion = "18.3.0-www-classic-707cd731";
+    var ReactVersion = "18.3.0-www-classic-863536b2";
 
     function createPortal$1(
       children,
diff --git a/compiled/facebook-www/ReactDOMTesting-dev.modern.js b/compiled/facebook-www/ReactDOMTesting-dev.modern.js
index 170aefad65daa..c2d3013e8d8a3 100644
--- a/compiled/facebook-www/ReactDOMTesting-dev.modern.js
+++ b/compiled/facebook-www/ReactDOMTesting-dev.modern.js
@@ -130,7 +130,8 @@ if (__DEV__) {
         dynamicFeatureFlags.transitionLaneExpirationMs,
       enableInfiniteRenderLoopDetection =
         dynamicFeatureFlags.enableInfiniteRenderLoopDetection,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext,
+      useModernStrictMode = dynamicFeatureFlags.useModernStrictMode; // On WWW, true is used for a new modern build.
     var enableProfilerTimer = true;
     var enableProfilerCommitHooks = true;
     var enableProfilerNestedUpdatePhase = true;
@@ -34442,9 +34443,121 @@ if (__DEV__) {
       }
     }
 
+    function recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+      root,
+      parentFiber,
+      isInStrictMode
+    ) {
+      if (
+        (parentFiber.subtreeFlags & (PlacementDEV | Visibility)) ===
+        NoFlags$1
+      ) {
+        // Parent's descendants have already had effects double invoked.
+        // Early exit to avoid unnecessary tree traversal.
+        return;
+      }
+
+      var child = parentFiber.child;
+
+      while (child !== null) {
+        doubleInvokeEffectsInDEVIfNecessary(root, child, isInStrictMode);
+        child = child.sibling;
+      }
+    } // Unconditionally disconnects and connects passive and layout effects.
+
+    function doubleInvokeEffectsOnFiber(root, fiber) {
+      var shouldDoubleInvokePassiveEffects =
+        arguments.length > 2 && arguments[2] !== undefined
+          ? arguments[2]
+          : true;
+      disappearLayoutEffects(fiber);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        disconnectPassiveEffect(fiber);
+      }
+
+      reappearLayoutEffects(root, fiber.alternate, fiber, false);
+
+      if (shouldDoubleInvokePassiveEffects) {
+        reconnectPassiveEffects(root, fiber, NoLanes, null, false);
+      }
+    }
+
+    function doubleInvokeEffectsInDEVIfNecessary(
+      root,
+      fiber,
+      parentIsInStrictMode
+    ) {
+      var isStrictModeFiber = fiber.type === REACT_STRICT_MODE_TYPE;
+      var isInStrictMode = parentIsInStrictMode || isStrictModeFiber; // First case: the fiber **is not** of type OffscreenComponent. No
+      // special rules apply to double invoking effects.
+
+      if (fiber.tag !== OffscreenComponent) {
+        if (fiber.flags & PlacementDEV) {
+          setCurrentFiber(fiber);
+
+          if (isInStrictMode) {
+            doubleInvokeEffectsOnFiber(
+              root,
+              fiber,
+              (fiber.mode & NoStrictPassiveEffectsMode) === NoMode
+            );
+          }
+
+          resetCurrentFiber();
+        } else {
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        return;
+      } // Second case: the fiber **is** of type OffscreenComponent.
+      // This branch contains cases specific to Offscreen.
+
+      if (fiber.memoizedState === null) {
+        // Only consider Offscreen that is visible.
+        // TODO (Offscreen) Handle manual mode.
+        setCurrentFiber(fiber);
+
+        if (isInStrictMode && fiber.flags & Visibility) {
+          // Double invoke effects on Offscreen's subtree only
+          // if it is visible and its visibility has changed.
+          doubleInvokeEffectsOnFiber(root, fiber);
+        } else if (fiber.subtreeFlags & PlacementDEV) {
+          // Something in the subtree could have been suspended.
+          // We need to continue traversal and find newly inserted fibers.
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            fiber,
+            isInStrictMode
+          );
+        }
+
+        resetCurrentFiber();
+      }
+    }
+
     function commitDoubleInvokeEffectsInDEV(root, hasPassiveEffects) {
       {
-        {
+        if (useModernStrictMode && root.tag !== LegacyRoot) {
+          var doubleInvokeEffects = true;
+
+          if (
+            root.tag === ConcurrentRoot &&
+            !(root.current.mode & (StrictLegacyMode | StrictEffectsMode))
+          ) {
+            doubleInvokeEffects = false;
+          }
+
+          recursivelyTraverseAndDoubleInvokeEffectsInDEV(
+            root,
+            root.current,
+            doubleInvokeEffects
+          );
+        } else {
           legacyCommitDoubleInvokeEffectsInDEV(root.current, hasPassiveEffects);
         }
       }
@@ -36183,7 +36296,7 @@ if (__DEV__) {
       return root;
     }
 
-    var ReactVersion = "18.3.0-www-modern-b7104184";
+    var ReactVersion = "18.3.0-www-modern-617357dc";
 
     function createPortal$1(
       children,
diff --git a/compiled/facebook-www/ReactIs-dev.classic.js b/compiled/facebook-www/ReactIs-dev.classic.js
index 00be917313512..1bd8c3bc78090 100644
--- a/compiled/facebook-www/ReactIs-dev.classic.js
+++ b/compiled/facebook-www/ReactIs-dev.classic.js
@@ -46,7 +46,8 @@ if (__DEV__) {
 
     var enableDebugTracing = dynamicFeatureFlags.enableDebugTracing,
       enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, false is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, false is used for a new modern build.
 
     var REACT_CLIENT_REFERENCE = Symbol.for("react.client.reference");
     function isValidElementType(type) {
diff --git a/compiled/facebook-www/ReactIs-dev.modern.js b/compiled/facebook-www/ReactIs-dev.modern.js
index c7eca24d881f1..f872c6bef144a 100644
--- a/compiled/facebook-www/ReactIs-dev.modern.js
+++ b/compiled/facebook-www/ReactIs-dev.modern.js
@@ -46,7 +46,8 @@ if (__DEV__) {
 
     var enableDebugTracing = dynamicFeatureFlags.enableDebugTracing,
       enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, true is used for a new modern build.
 
     var REACT_CLIENT_REFERENCE = Symbol.for("react.client.reference");
     function isValidElementType(type) {
diff --git a/compiled/facebook-www/ReactServer-dev.modern.js b/compiled/facebook-www/ReactServer-dev.modern.js
index 0d086b6981892..7de57b52392a4 100644
--- a/compiled/facebook-www/ReactServer-dev.modern.js
+++ b/compiled/facebook-www/ReactServer-dev.modern.js
@@ -84,7 +84,8 @@ if (__DEV__) {
 
     var enableDebugTracing = dynamicFeatureFlags.enableDebugTracing,
       enableTransitionTracing = dynamicFeatureFlags.enableTransitionTracing,
-      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext; // On WWW, true is used for a new modern build.
+      enableRenderableContext = dynamicFeatureFlags.enableRenderableContext;
+    // On WWW, true is used for a new modern build.
 
     /**
      * Keeps track of the current Cache dispatcher.
@@ -2662,7 +2663,7 @@ if (__DEV__) {
             console["error"](error);
           };
 
-    var ReactVersion = "18.3.0-www-modern-508518a5";
+    var ReactVersion = "18.3.0-www-modern-a192cdd2";
 
     // Patch fetch
     var Children = {