diff --git a/lib/src/generator/templates.runtime_renderers.dart b/lib/src/generator/templates.runtime_renderers.dart
index dccea51ec6..5873b61e8c 100644
--- a/lib/src/generator/templates.runtime_renderers.dart
+++ b/lib/src/generator/templates.runtime_renderers.dart
@@ -5394,18 +5394,7 @@ class _Renderer_ExtensionType extends RendererBase<ExtensionType> {
           () => {
                 ..._Renderer_InheritingContainer.propertyMap<CT_>(),
                 ..._Renderer_Constructable.propertyMap<CT_>(),
-                'allFields': Property(
-                  getValue: (CT_ c) => c.allFields,
-                  renderVariable: (CT_ c, Property<CT_> self,
-                          List<String> remainingNames) =>
-                      self.renderSimpleVariable(
-                          c, remainingNames, 'List<Field>'),
-                  renderIterable: (CT_ c, RendererBase<CT_> r,
-                      List<MustachioNode> ast, StringSink sink) {
-                    return c.allFields.map((e) =>
-                        _render_Field(e, ast, r.template, sink, parent: r));
-                  },
-                ),
+                ..._Renderer_TypeImplementing.propertyMap<CT_>(),
                 'allModelElements': Property(
                   getValue: (CT_ c) => c.allModelElements,
                   renderVariable: (CT_ c, Property<CT_> self,
@@ -5489,13 +5478,6 @@ class _Renderer_ExtensionType extends RendererBase<ExtensionType> {
                         parent: r);
                   },
                 ),
-                'hasPublicInterfaces': Property(
-                  getValue: (CT_ c) => c.hasPublicInterfaces,
-                  renderVariable: (CT_ c, Property<CT_> self,
-                          List<String> remainingNames) =>
-                      self.renderSimpleVariable(c, remainingNames, 'bool'),
-                  getBool: (CT_ c) => c.hasPublicInterfaces == true,
-                ),
                 'inheritanceChain': Property(
                   getValue: (CT_ c) => c.inheritanceChain,
                   renderVariable: (CT_ c, Property<CT_> self,
@@ -5509,30 +5491,6 @@ class _Renderer_ExtensionType extends RendererBase<ExtensionType> {
                             parent: r));
                   },
                 ),
-                'inheritedMethods': Property(
-                  getValue: (CT_ c) => c.inheritedMethods,
-                  renderVariable: (CT_ c, Property<CT_> self,
-                          List<String> remainingNames) =>
-                      self.renderSimpleVariable(
-                          c, remainingNames, 'Iterable<Method>'),
-                  renderIterable: (CT_ c, RendererBase<CT_> r,
-                      List<MustachioNode> ast, StringSink sink) {
-                    return c.inheritedMethods.map((e) =>
-                        _render_Method(e, ast, r.template, sink, parent: r));
-                  },
-                ),
-                'inheritedOperators': Property(
-                  getValue: (CT_ c) => c.inheritedOperators,
-                  renderVariable: (CT_ c, Property<CT_> self,
-                          List<String> remainingNames) =>
-                      self.renderSimpleVariable(
-                          c, remainingNames, 'List<Operator>'),
-                  renderIterable: (CT_ c, RendererBase<CT_> r,
-                      List<MustachioNode> ast, StringSink sink) {
-                    return c.inheritedOperators.map((e) =>
-                        _render_Operator(e, ast, r.template, sink, parent: r));
-                  },
-                ),
                 'isAbstract': Property(
                   getValue: (CT_ c) => c.isAbstract,
                   renderVariable: (CT_ c, Property<CT_> self,
@@ -5580,19 +5538,6 @@ class _Renderer_ExtensionType extends RendererBase<ExtensionType> {
                         parent: r, getters: _invisibleGetters['Kind']!);
                   },
                 ),
-                'publicInterfaces': Property(
-                  getValue: (CT_ c) => c.publicInterfaces,
-                  renderVariable: (CT_ c, Property<CT_> self,
-                          List<String> remainingNames) =>
-                      self.renderSimpleVariable(
-                          c, remainingNames, 'List<DefinedElementType>'),
-                  renderIterable: (CT_ c, RendererBase<CT_> r,
-                      List<MustachioNode> ast, StringSink sink) {
-                    return c.publicInterfaces.map((e) =>
-                        _render_DefinedElementType(e, ast, r.template, sink,
-                            parent: r));
-                  },
-                ),
                 'referenceChildren': Property(
                   getValue: (CT_ c) => c.referenceChildren,
                   renderVariable: (CT_ c, Property<CT_> self,
@@ -17003,6 +16948,7 @@ const _invisibleGetters = {
     'hashCode',
     'implementors',
     'inheritThrough',
+    'inheritanceManager',
     'invisibleAnnotations',
     'libraries',
     'libraryCount',
diff --git a/lib/src/model/container_member.dart b/lib/src/model/container_member.dart
index 6e8791806d..2a574c682f 100644
--- a/lib/src/model/container_member.dart
+++ b/lib/src/model/container_member.dart
@@ -38,13 +38,13 @@ mixin ContainerMember on ModelElement implements EnclosedElement {
 
   Container? computeCanonicalEnclosingContainer() {
     final enclosingElement = this.enclosingElement;
-    if (enclosingElement is! Extension) {
-      return packageGraph.findCanonicalModelElementFor(element.enclosingElement)
-          as Container?;
-    }
-    // TODO(jcollins-g): move Extension specific code to [Extendable]
-    return packageGraph.findCanonicalModelElementFor(enclosingElement.element)
-        as Container?;
+    return switch (enclosingElement) {
+      Extension() =>
+        packageGraph.findCanonicalModelElementFor(enclosingElement.element),
+      ExtensionType() =>
+        packageGraph.findCanonicalModelElementFor(enclosingElement.element),
+      _ => packageGraph.findCanonicalModelElementFor(element.enclosingElement),
+    } as Container?;
   }
 
   @override
diff --git a/lib/src/model/extension_type.dart b/lib/src/model/extension_type.dart
index 1f6566b537..98b9577d09 100644
--- a/lib/src/model/extension_type.dart
+++ b/lib/src/model/extension_type.dart
@@ -8,7 +8,8 @@ import 'package:dartdoc/src/model/comment_referable.dart';
 import 'package:dartdoc/src/model/model.dart';
 import 'package:meta/meta.dart';
 
-class ExtensionType extends InheritingContainer with Constructable {
+class ExtensionType extends InheritingContainer
+    with Constructable, TypeImplementing {
   @override
   final ExtensionTypeElement element;
 
@@ -38,25 +39,6 @@ class ExtensionType extends InheritingContainer with Constructable {
   @override
   bool get isSealed => false;
 
-  bool get hasPublicInterfaces => publicInterfaces.isNotEmpty;
-
-  @override
-  List<DefinedElementType> get publicInterfaces {
-    var interfaces = <DefinedElementType>[];
-    for (var interface in element.interfaces) {
-      var elementType =
-          modelBuilder.typeFrom(interface, library) as DefinedElementType;
-
-      if (elementType.modelElement.canonicalModelElement != null) {
-        interfaces.add(elementType);
-        continue;
-      }
-
-      // TODO(srawlins): Work through intermediate, private, interfaces.
-    }
-    return interfaces;
-  }
-
   @override
   late final List<Field> declaredFields = element.fields.map((field) {
     Accessor? getter, setter;
@@ -79,20 +61,10 @@ class ExtensionType extends InheritingContainer with Constructable {
   ];
 
   @override
-  // TODO(srawlins): Implement.
-  List<Field> get allFields => [];
-
-  @override
-  // TODO(srawlins): Implement.
-  Iterable<Method> get inheritedMethods => [];
-
-  @override
-  // TODO(srawlins): Implement.
-  List<Operator> get inheritedOperators => [];
-
-  @override
-  // TODO(srawlins): Implement. It might just be empty...
-  List<InheritingContainer> get inheritanceChain => [];
+  late final List<InheritingContainer> inheritanceChain = [
+    this,
+    ...interfaces.expandInheritanceChain,
+  ];
 
   @override
   String get filePath => '${library.dirName}/${fileStructure.fileName}';
diff --git a/lib/src/model/inheritable.dart b/lib/src/model/inheritable.dart
index 50dfb454af..1403f67424 100644
--- a/lib/src/model/inheritable.dart
+++ b/lib/src/model/inheritable.dart
@@ -8,15 +8,16 @@ import 'package:dartdoc/src/model/attribute.dart';
 import 'package:dartdoc/src/model/model.dart';
 import 'package:dartdoc/src/special_elements.dart';
 
-/// Mixin for subclasses of ModelElement representing Elements that can be
+/// Mixin for subclasses of [ModelElement] representing elements that can be
 /// inherited from one class to another.
 ///
 /// We can search the inheritance chain between this instance and
 /// [definingEnclosingContainer] in [Inheritable.canonicalEnclosingContainer],
 /// for the canonical [Class] closest to where this member was defined.  We
-/// can then know that when we find [Inheritable.modelElement] inside that [Class]'s
-/// namespace, that's the one we should treat as canonical and implementors
-/// of this class can use that knowledge to determine canonicalization.
+/// can then know that when we find [Inheritable.modelElement] inside that
+/// [Class]'s namespace, that's the one we should treat as canonical and
+/// implementors of this class can use that knowledge to determine
+/// canonicalization.
 ///
 /// We pick the class closest to the [definingEnclosingContainer] so that all
 /// children of that class inheriting the same member will point to the same
@@ -89,7 +90,10 @@ mixin Inheritable on ContainerMember {
       // classes.
       if (definingEnclosingContainer.isCanonical &&
           definingEnclosingContainer.isPublic) {
-        assert(definingEnclosingContainer == found);
+        assert(
+            definingEnclosingContainer == found,
+            'For $element, expected $definingEnclosingContainer to be Object '
+            'or $found, but was neither.');
       }
       if (found != null) {
         return found;
@@ -106,13 +110,13 @@ mixin Inheritable on ContainerMember {
     var inheritance = [
       ...(enclosingElement as InheritingContainer).inheritanceChain,
     ];
-    var object = packageGraph.specialClasses[SpecialClass.object];
+    var object = packageGraph.specialClasses[SpecialClass.object]!;
+
     assert(definingEnclosingContainer == object ||
         inheritance.contains(definingEnclosingContainer));
-
-    // Unless the code explicitly extends dart-core's Object, we won't get
+    // Unless the code explicitly extends dart:core's Object, we won't get
     // an entry here.  So add it.
-    if (inheritance.last != object && object != null) {
+    if (inheritance.last != object) {
       inheritance.add(object);
     }
     assert(inheritance.where((e) => e == object).length == 1);
diff --git a/lib/src/model/inheriting_container.dart b/lib/src/model/inheriting_container.dart
index 1a7613f968..d03d36fd2e 100644
--- a/lib/src/model/inheriting_container.dart
+++ b/lib/src/model/inheriting_container.dart
@@ -4,9 +4,6 @@
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
-// ignore: implementation_imports
-import 'package:analyzer/src/dart/element/inheritance_manager3.dart'
-    show InheritanceManager3;
 import 'package:collection/collection.dart' show IterableExtension;
 import 'package:dartdoc/src/element_type.dart';
 import 'package:dartdoc/src/model/comment_referable.dart';
@@ -154,8 +151,9 @@ abstract class InheritingContainer extends Container
     }
 
     final concreteInheritenceMap =
-        _inheritanceManager.getInheritedConcreteMap2(element);
-    final inheritenceMap = _inheritanceManager.getInheritedMap2(element);
+        packageGraph.inheritanceManager.getInheritedConcreteMap2(element);
+    final inheritenceMap =
+        packageGraph.inheritanceManager.getInheritedMap2(element);
 
     List<InterfaceElement>? inheritanceChainElements;
 
@@ -195,8 +193,6 @@ abstract class InheritingContainer extends Container
     return combinedMap.values.toList(growable: false);
   }
 
-  static final InheritanceManager3 _inheritanceManager = InheritanceManager3();
-
   /// All fields defined on this container, _including inherited fields_.
   List<Field> get allFields {
     var inheritedAccessorElements = {
diff --git a/lib/src/model/package_graph.dart b/lib/src/model/package_graph.dart
index cc68c84293..0dceb65876 100644
--- a/lib/src/model/package_graph.dart
+++ b/lib/src/model/package_graph.dart
@@ -8,6 +8,9 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/file_system/file_system.dart';
 // ignore: implementation_imports
+import 'package:analyzer/src/dart/element/inheritance_manager3.dart'
+    show InheritanceManager3;
+// ignore: implementation_imports
 import 'package:analyzer/src/generated/sdk.dart' show DartSdk, SdkLibrary;
 // ignore: implementation_imports
 import 'package:analyzer/src/generated/source.dart' show Source;
@@ -43,6 +46,8 @@ class PackageGraph with CommentReferable, Nameable, ModelBuilder {
     Package.fromPackageMeta(packageMeta, this);
   }
 
+  final InheritanceManager3 inheritanceManager = InheritanceManager3();
+
   void dispose() {
     // Clear out any cached tool snapshots and temporary directories.
     // TODO(jcollins-g): Consider ownership change for these objects
diff --git a/test/templates/extension_type_test.dart b/test/templates/extension_type_test.dart
index b748b2a219..ecd52eba7f 100644
--- a/test/templates/extension_type_test.dart
+++ b/test/templates/extension_type_test.dart
@@ -73,7 +73,13 @@ analyzer:
 ''',
         libFiles: [
           d.file('lib.dart', '''
-class Base1<E> {}
+class Base1<E> {
+  // An inherited method.
+  void m2() {}
+
+  // An inherited field.
+  int get field1 => 1;
+}
 
 class Base2 {}
 
@@ -81,7 +87,7 @@ class Foo<E> extends Base1<E>, Base2 {}
 
 class FooSub extends Foo<int> {}
 
-extension type One<E>(Foo<E> e) {
+extension type One<E>(Foo<E> it) {
   /// A named constructor.
   MyIterable.named(Foo<E> e);
 
@@ -109,7 +115,7 @@ extension type One<E>(Foo<E> e) {
 
 extension type TwoWithBase<E>(Foo<E> it) implements Base1<E>, Base2 {}
 
-extension type ThreeWithOne<E>(FooSub it) implements One<int> {}
+extension type ThreeWithOne<E>(FooSub it3) implements One<int> {}
 '''),
         ],
         dartdocOptions: '''
@@ -216,8 +222,66 @@ dartdoc:
       },
     );
 
-    test('page contains instance operators', () async {
+    test('page contains representation field', () async {
+      oneLines.expectMainContentContainsAllInOrder([
+        matches('<h2>Properties</h2>'),
+        matches('<a href="../lib/One/it.html">it</a>'),
+        matches('An operator.'),
+      ]);
+    });
+
+    test('page contains inherited representation field', () async {
+      threeLines.expectMainContentContainsAllInOrder([
+        matches('<h2>Properties</h2>'),
+        matches('<a href="../lib/One/it.html">it</a>'),
+      ]);
+    });
+
+    test('page contains inherited getters', () async {
+      twoLines.expectMainContentContainsAllInOrder([
+        matches('<h2>Properties</h2>'),
+        matches('<a href="../lib/Base1/field1.html">field1</a>'),
+      ]);
+    });
+
+    test('page contains instance methods', () async {
       oneLines.expectMainContentContainsAllInOrder([
+        matches('<h2>Methods</h2>'),
+        matches('<dt id="m1" class="callable">'),
+        matches('<a href="../lib/One/m1.html">m1</a>'),
+        matches('An instance method.'),
+      ]);
+    });
+
+    test('page contains methods inherited from a class super-interface',
+        () async {
+      twoLines.expectMainContentContainsAllInOrder([
+        matches('<h2>Methods</h2>'),
+        matches('<dt id="m2" class="callable inherited">'),
+        matches('<a href="../lib/Base1/m2.html">m2</a>'),
+      ]);
+    });
+
+    test(
+        'page contains methods inherited from an extension type '
+        'super-interface', () async {
+      threeLines.expectMainContentContainsAllInOrder([
+        matches('<h2>Methods</h2>'),
+        matches('<dt id="m1" class="callable inherited">'),
+        matches('<a href="../lib/One/m1.html">m1</a>'),
+      ]);
+    });
+
+    test('page contains operators', () async {
+      oneLines.expectMainContentContainsAllInOrder([
+        matches('<h2>Operators</h2>'),
+        matches('<a href="../lib/One/operator_greater.html">operator ></a>'),
+        matches('An operator.'),
+      ]);
+    });
+
+    test('page contains inherited operators', () async {
+      threeLines.expectMainContentContainsAllInOrder([
         matches('<h2>Operators</h2>'),
         matches('<a href="../lib/One/operator_greater.html">operator ></a>'),
         matches('An operator.'),