diff --git a/packages/flutter/lib/src/web.dart b/packages/flutter/lib/src/web.dart
index 3a012d7d749..9bfb3e34971 100644
--- a/packages/flutter/lib/src/web.dart
+++ b/packages/flutter/lib/src/web.dart
@@ -33,11 +33,7 @@ external Document get document;
 @JS()
 external Window get window;
 
-@JS('CSSStyleDeclaration')
-@staticInterop
-class CSSStyleDeclaration {}
-
-extension CSSStyleDeclarationExtension on CSSStyleDeclaration {
+extension type CSSStyleDeclaration._(JSObject _) implements JSObject {
   external set backgroundColor(String value);
   external String get backgroundColor;
   external set border(String value);
@@ -48,22 +44,14 @@ extension CSSStyleDeclarationExtension on CSSStyleDeclaration {
   external String get width;
 }
 
-@JS('CSSStyleSheet')
-@staticInterop
-class CSSStyleSheet {}
-
-extension CSSStyleSheetExtension on CSSStyleSheet {
+extension type CSSStyleSheet._(JSObject _) implements JSObject {
   external int insertRule(
     String rule, [
     int index,
   ]);
 }
 
-@JS('Document')
-@staticInterop
-class Document implements Node {}
-
-extension DocumentExtension on Document {
+extension type Document._(JSObject _) implements JSObject {
   external Element createElement(
     String localName, [
     JSAny options,
@@ -72,32 +60,18 @@ extension DocumentExtension on Document {
   external HTMLHeadElement? get head;
 }
 
-@JS('DOMTokenList')
-@staticInterop
-class DOMTokenList {}
-
-extension DOMTokenListExtension on DOMTokenList {
+extension type DOMTokenList._(JSObject _) implements JSObject {
   external void add(String tokens);
 }
 
-@JS('Element')
-@staticInterop
-class Element implements Node {}
-
-extension ElementExtension on Element {
+extension type Element._(JSObject _) implements Node, JSObject {
   external DOMTokenList get classList;
   external void append(JSAny nodes);
 }
 
-@JS('Event')
-@staticInterop
-class Event {}
+extension type Event._(JSObject _) implements JSObject {}
 
-@JS('EventTarget')
-@staticInterop
-class EventTarget {}
-
-extension EventTargetExtension on EventTarget {
+extension type EventTarget._(JSObject _) implements JSObject {
   external void addEventListener(
     String type,
     EventListener? callback, [
@@ -105,91 +79,52 @@ extension EventTargetExtension on EventTarget {
   ]);
 }
 
-@JS('HTMLElement')
-@staticInterop
-class HTMLElement implements Element {}
-
-extension HTMLElementExtension on HTMLElement {
+extension type HTMLElement._(JSObject _) implements Element, JSObject {
+  external String get innerText;
   external set innerText(String value);
   external CSSStyleDeclaration get style;
 }
 
-@JS('HTMLHeadElement')
-@staticInterop
-class HTMLHeadElement implements HTMLElement {}
+extension type HTMLHeadElement._(JSObject _) implements HTMLElement, JSObject {}
 
-@JS('HTMLStyleElement')
-@staticInterop
-class HTMLStyleElement implements HTMLElement {}
-
-extension HTMLStyleElementExtension on HTMLStyleElement {
+extension type HTMLStyleElement._(JSObject _) implements HTMLElement, JSObject {
   external CSSStyleSheet? get sheet;
 }
 
-@JS('MediaQueryList')
-@staticInterop
-class MediaQueryList {}
-
-extension MediaQueryListExtension on MediaQueryList {
+extension type MediaQueryList._(JSObject _) implements EventTarget, JSObject {
   external bool get matches;
 }
 
-@JS('MouseEvent')
-@staticInterop
-class MouseEvent {}
-
-extension MouseEventExtension on MouseEvent {
+extension type MouseEvent._(JSObject _) implements JSObject {
   external num get offsetX;
   external num get offsetY;
   external int get button;
 }
 
-@JS('Navigator')
-@staticInterop
-class Navigator {}
-
-extension NavigatorExtension on Navigator {
+extension type Navigator._(JSObject _) implements JSObject {
   external String get platform;
 }
 
-@JS('Node')
-@staticInterop
-class Node implements EventTarget {}
+extension type Node._(JSObject _) implements EventTarget, JSObject {}
 
-@JS('Range')
-@staticInterop
-class Range {}
-
-extension RangeExtension on Range {
+extension type Range._(JSObject _) implements JSObject {
   external void selectNode(Node node);
 }
 
-@JS('Selection')
-@staticInterop
-class Selection {}
-
-extension SelectionExtension on Selection {
+extension type Selection._(JSObject _) implements JSObject {
   external void addRange(Range range);
   external void removeAllRanges();
 }
 
-@JS('Window')
-@staticInterop
-class Window {}
-
-extension WindowExtension on Window {
+extension type Window._(JSObject _) implements EventTarget, JSObject {
   external Navigator get navigator;
   external MediaQueryList matchMedia(String query);
   external Selection? getSelection();
 }
 
-@JS('XMLHttpRequest')
-@staticInterop
-class XMLHttpRequest implements XMLHttpRequestEventTarget {
+extension type XMLHttpRequest._(JSObject _)
+    implements XMLHttpRequestEventTarget, JSObject {
   external factory XMLHttpRequest();
-}
-
-extension XMLHttpRequestExtension on XMLHttpRequest {
   external void open(
     String method,
     String url, [
@@ -208,6 +143,5 @@ extension XMLHttpRequestExtension on XMLHttpRequest {
   external JSAny? get response;
 }
 
-@JS('XMLHttpRequestEventTarget')
-@staticInterop
-class XMLHttpRequestEventTarget implements EventTarget {}
+extension type XMLHttpRequestEventTarget._(JSObject _)
+    implements EventTarget, JSObject {}
diff --git a/packages/flutter/pubspec.yaml b/packages/flutter/pubspec.yaml
index dff98955e03..10b120a6bc7 100644
--- a/packages/flutter/pubspec.yaml
+++ b/packages/flutter/pubspec.yaml
@@ -3,7 +3,7 @@ description: A framework for writing Flutter applications
 homepage: https://flutter.dev
 
 environment:
-  sdk: '>=3.2.0-0 <4.0.0'
+  sdk: '>=3.3.0-0 <4.0.0'
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".