diff --git a/pkg/analysis_server/doc/api.html b/pkg/analysis_server/doc/api.html
index 6b9305a17ef..b792411dbfe 100644
--- a/pkg/analysis_server/doc/api.html
+++ b/pkg/analysis_server/doc/api.html
@@ -4763,7 +4763,7 @@ a:focus, a:hover {
   <dl><dt class="value">ANNOTATION</dt><dt class="value">BUILT_IN</dt><dt class="value">CLASS</dt><dt class="value">COMMENT_BLOCK</dt><dt class="value">COMMENT_DOCUMENTATION</dt><dt class="value">COMMENT_END_OF_LINE</dt><dt class="value">CONSTRUCTOR</dt><dt class="value">CONSTRUCTOR_TEAR_OFF</dt><dt class="value">DIRECTIVE</dt><dt class="value">DYNAMIC_TYPE</dt><dd>
         
         <p>Deprecated - no longer sent.</p>
-      </dd><dt class="value">DYNAMIC_LOCAL_VARIABLE_DECLARATION</dt><dt class="value">DYNAMIC_LOCAL_VARIABLE_REFERENCE</dt><dt class="value">DYNAMIC_PARAMETER_DECLARATION</dt><dt class="value">DYNAMIC_PARAMETER_REFERENCE</dt><dt class="value">ENUM</dt><dt class="value">ENUM_CONSTANT</dt><dt class="value">EXTENSION</dt><dt class="value">FIELD</dt><dd>
+      </dd><dt class="value">DYNAMIC_LOCAL_VARIABLE_DECLARATION</dt><dt class="value">DYNAMIC_LOCAL_VARIABLE_REFERENCE</dt><dt class="value">DYNAMIC_PARAMETER_DECLARATION</dt><dt class="value">DYNAMIC_PARAMETER_REFERENCE</dt><dt class="value">ENUM</dt><dt class="value">ENUM_CONSTANT</dt><dt class="value">EXTENSION</dt><dt class="value">EXTENSION_TYPE</dt><dt class="value">FIELD</dt><dd>
         
         <p>Deprecated - no longer sent.</p>
       </dd><dt class="value">FIELD_STATIC</dt><dd>
diff --git a/pkg/analysis_server/lib/src/computer/computer_highlights.dart b/pkg/analysis_server/lib/src/computer/computer_highlights.dart
index 853da0da638..8130e193606 100644
--- a/pkg/analysis_server/lib/src/computer/computer_highlights.dart
+++ b/pkg/analysis_server/lib/src/computer/computer_highlights.dart
@@ -184,6 +184,8 @@ class DartUnitHighlightsComputer {
       semanticModifiers = {CustomSemanticTokenModifiers.constructor};
     } else if (element is EnumElement) {
       type = HighlightRegionType.ENUM;
+    } else if (element is ExtensionTypeElement) {
+      type = HighlightRegionType.EXTENSION_TYPE;
     } else {
       type = HighlightRegionType.CLASS;
       if (parent is ConstructorDeclaration) {
@@ -862,6 +864,27 @@ class _DartUnitHighlightsComputerVisitor extends RecursiveAstVisitor<void> {
     super.visitExtensionOverride(node);
   }
 
+  @override
+  void visitExtensionTypeDeclaration(ExtensionTypeDeclaration node) {
+    computer._addRegion_token(
+      node.extensionKeyword,
+      HighlightRegionType.BUILT_IN,
+    );
+
+    computer._addRegion_token(
+      node.typeKeyword,
+      HighlightRegionType.BUILT_IN,
+    );
+
+    computer._addRegion_token(
+      node.name,
+      HighlightRegionType.EXTENSION_TYPE,
+      semanticTokenModifiers: {SemanticTokenModifiers.declaration},
+    );
+
+    super.visitExtensionTypeDeclaration(node);
+  }
+
   @override
   void visitFieldDeclaration(FieldDeclaration node) {
     computer._addRegion_token(
@@ -1269,6 +1292,32 @@ class _DartUnitHighlightsComputerVisitor extends RecursiveAstVisitor<void> {
     super.visitRecordTypeAnnotation(node);
   }
 
+  @override
+  void visitRepresentationConstructorName(RepresentationConstructorName node) {
+    computer._addRegion_token(
+      node.name,
+      HighlightRegionType.CONSTRUCTOR,
+      semanticTokenType: SemanticTokenTypes.method,
+      semanticTokenModifiers: {
+        CustomSemanticTokenModifiers.constructor,
+        SemanticTokenModifiers.declaration,
+      },
+    );
+
+    super.visitRepresentationConstructorName(node);
+  }
+
+  @override
+  void visitRepresentationDeclaration(RepresentationDeclaration node) {
+    computer._addRegion_token(
+      node.fieldName,
+      HighlightRegionType.INSTANCE_FIELD_DECLARATION,
+      semanticTokenModifiers: {SemanticTokenModifiers.declaration},
+    );
+
+    super.visitRepresentationDeclaration(node);
+  }
+
   @override
   void visitRethrowExpression(RethrowExpression node) {
     computer._addRegion_token(node.rethrowKeyword, HighlightRegionType.KEYWORD,
diff --git a/pkg/analysis_server/test/analysis/notification_highlights2_test.dart b/pkg/analysis_server/test/analysis/notification_highlights2_test.dart
index 21bf24c967a..16fad28a651 100644
--- a/pkg/analysis_server/test/analysis/notification_highlights2_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_highlights2_test.dart
@@ -1099,6 +1099,25 @@ void f() {
     assertHasRegion(HighlightRegionType.EXTENSION, 'E.bar()');
   }
 
+  Future<void> test_extensionType() async {
+    final testCode = TestCode.parse(r'''
+extension type A<T>.named(int it) implements num {}
+''');
+    addTestFile(testCode.code);
+    await prepareHighlights();
+    assertHighlightText(testCode, -1, r'''
+0 + 9 |extension| BUILT_IN
+10 + 4 |type| BUILT_IN
+15 + 1 |A| EXTENSION_TYPE
+17 + 1 |T| TYPE_PARAMETER
+20 + 5 |named| CONSTRUCTOR
+26 + 3 |int| CLASS
+30 + 2 |it| INSTANCE_FIELD_DECLARATION
+34 + 10 |implements| BUILT_IN
+45 + 3 |num| CLASS
+''');
+  }
+
   Future<void> test_forEachPartsWithPattern_final() async {
     addTestFile('''
 void f(List<Object> l) {
@@ -1242,6 +1261,40 @@ class A {
     assertHasRegion(HighlightRegionType.INSTANCE_FIELD_REFERENCE, 'f);');
   }
 
+  Future<void> test_instanceCreation_class() async {
+    final testCode = TestCode.parse(r'''
+class A {
+  A.named(int it);
+}
+void f() {
+  [!A.named(0)!];
+}
+''');
+    addTestFile(testCode.code);
+    await prepareHighlights();
+    assertHighlightText(testCode, 0, r'''
+44 + 1 |A| CONSTRUCTOR
+46 + 5 |named| CONSTRUCTOR
+52 + 1 |0| LITERAL_INTEGER
+''');
+  }
+
+  Future<void> test_instanceCreation_extensionType() async {
+    final testCode = TestCode.parse(r'''
+extension type A.named(T it) {}
+void f() {
+  [!A.named(0)!];
+}
+''');
+    addTestFile(testCode.code);
+    await prepareHighlights();
+    assertHighlightText(testCode, 0, r'''
+45 + 1 |A| CONSTRUCTOR
+47 + 5 |named| CONSTRUCTOR
+53 + 1 |0| LITERAL_INTEGER
+''');
+  }
+
   Future<void> test_KEYWORD() async {
     addTestFile('''
 void f() {
@@ -1617,6 +1670,19 @@ void g() {
     assertHasRegion(HighlightRegionType.PARAMETER_REFERENCE, 'a: 0');
   }
 
+  Future<void> test_namedType_extensionType() async {
+    final testCode = TestCode.parse(r'''
+extension type A<T>(T it) {}
+void f([!A<int>!] a) {}
+''');
+    addTestFile(testCode.code);
+    await prepareHighlights();
+    assertHighlightText(testCode, 0, r'''
+36 + 1 |A| EXTENSION_TYPE
+38 + 3 |int| CLASS
+''');
+  }
+
   Future<void> test_PARAMETER() async {
     addTestFile('''
 void f(int p) {
@@ -1725,6 +1791,23 @@ void f(Object o) {
     assertHasRegion(HighlightRegionType.KEYWORD, 'var');
   }
 
+  Future<void> test_propertyAccess_extensionTypeName() async {
+    final testCode = TestCode.parse(r'''
+extension type A.named(T it) {
+  static const V = 0;
+}
+void f() {
+  [!A.V!];
+}
+''');
+    addTestFile(testCode.code);
+    await prepareHighlights();
+    assertHighlightText(testCode, 0, r'''
+68 + 1 |A| EXTENSION_TYPE
+70 + 1 |V| STATIC_GETTER_REFERENCE
+''');
+  }
+
   Future<void> test_recordTypeAnnotation_named() async {
     addTestFile('''
 ({int f1, String f2})? r;
diff --git a/pkg/analysis_server/test/integration/support/protocol_matchers.dart b/pkg/analysis_server/test/integration/support/protocol_matchers.dart
index b4b484853f1..224b886f43d 100644
--- a/pkg/analysis_server/test/integration/support/protocol_matchers.dart
+++ b/pkg/analysis_server/test/integration/support/protocol_matchers.dart
@@ -807,6 +807,7 @@ final Matcher isHighlightRegion = LazyMatcher(() => MatchesJsonObject(
 ///   ENUM
 ///   ENUM_CONSTANT
 ///   EXTENSION
+///   EXTENSION_TYPE
 ///   FIELD
 ///   FIELD_STATIC
 ///   FUNCTION
@@ -891,6 +892,7 @@ final Matcher isHighlightRegionType = MatchesEnum('HighlightRegionType', [
   'ENUM',
   'ENUM_CONSTANT',
   'EXTENSION',
+  'EXTENSION_TYPE',
   'FIELD',
   'FIELD_STATIC',
   'FUNCTION',
diff --git a/pkg/analysis_server/tool/spec/generated/java/types/HighlightRegionType.java b/pkg/analysis_server/tool/spec/generated/java/types/HighlightRegionType.java
index 56cdb49c97f..4a03008aab6 100644
--- a/pkg/analysis_server/tool/spec/generated/java/types/HighlightRegionType.java
+++ b/pkg/analysis_server/tool/spec/generated/java/types/HighlightRegionType.java
@@ -52,6 +52,8 @@ public class HighlightRegionType {
 
   public static final String EXTENSION = "EXTENSION";
 
+  public static final String EXTENSION_TYPE = "EXTENSION_TYPE";
+
   /**
    * Deprecated - no longer sent.
    */
diff --git a/pkg/analysis_server_client/lib/src/protocol/protocol_common.dart b/pkg/analysis_server_client/lib/src/protocol/protocol_common.dart
index 877607aa55e..815c4cabb6c 100644
--- a/pkg/analysis_server_client/lib/src/protocol/protocol_common.dart
+++ b/pkg/analysis_server_client/lib/src/protocol/protocol_common.dart
@@ -1897,6 +1897,7 @@ class HighlightRegion implements HasToJson {
 ///   ENUM
 ///   ENUM_CONSTANT
 ///   EXTENSION
+///   EXTENSION_TYPE
 ///   FIELD
 ///   FIELD_STATIC
 ///   FUNCTION
@@ -2015,6 +2016,9 @@ class HighlightRegionType implements Enum {
   static const HighlightRegionType EXTENSION =
       HighlightRegionType._('EXTENSION');
 
+  static const HighlightRegionType EXTENSION_TYPE =
+      HighlightRegionType._('EXTENSION_TYPE');
+
   /// Deprecated - no longer sent.
   static const HighlightRegionType FIELD = HighlightRegionType._('FIELD');
 
@@ -2236,6 +2240,7 @@ class HighlightRegionType implements Enum {
     ENUM,
     ENUM_CONSTANT,
     EXTENSION,
+    EXTENSION_TYPE,
     FIELD,
     FIELD_STATIC,
     FUNCTION,
@@ -2344,6 +2349,8 @@ class HighlightRegionType implements Enum {
         return ENUM_CONSTANT;
       case 'EXTENSION':
         return EXTENSION;
+      case 'EXTENSION_TYPE':
+        return EXTENSION_TYPE;
       case 'FIELD':
         return FIELD;
       case 'FIELD_STATIC':
diff --git a/pkg/analyzer/lib/src/dart/ast/ast.dart b/pkg/analyzer/lib/src/dart/ast/ast.dart
index 944f81a6915..f4e596cead8 100644
--- a/pkg/analyzer/lib/src/dart/ast/ast.dart
+++ b/pkg/analyzer/lib/src/dart/ast/ast.dart
@@ -6818,6 +6818,7 @@ final class ExtensionTypeDeclarationImpl extends NamedCompilationUnitMemberImpl
     super.visitChildren(visitor);
     typeParameters?.accept(visitor);
     representation.accept(visitor);
+    implementsClause?.accept(visitor);
     members.accept(visitor);
   }
 }
diff --git a/pkg/analyzer_plugin/doc/api.html b/pkg/analyzer_plugin/doc/api.html
index e2d7a05785c..beb55a5606a 100644
--- a/pkg/analyzer_plugin/doc/api.html
+++ b/pkg/analyzer_plugin/doc/api.html
@@ -1419,7 +1419,7 @@ a:focus, a:hover {
   <dl><dt class="value">ANNOTATION</dt><dt class="value">BUILT_IN</dt><dt class="value">CLASS</dt><dt class="value">COMMENT_BLOCK</dt><dt class="value">COMMENT_DOCUMENTATION</dt><dt class="value">COMMENT_END_OF_LINE</dt><dt class="value">CONSTRUCTOR</dt><dt class="value">CONSTRUCTOR_TEAR_OFF</dt><dt class="value">DIRECTIVE</dt><dt class="value">DYNAMIC_TYPE</dt><dd>
         
         <p>Deprecated - no longer sent.</p>
-      </dd><dt class="value">DYNAMIC_LOCAL_VARIABLE_DECLARATION</dt><dt class="value">DYNAMIC_LOCAL_VARIABLE_REFERENCE</dt><dt class="value">DYNAMIC_PARAMETER_DECLARATION</dt><dt class="value">DYNAMIC_PARAMETER_REFERENCE</dt><dt class="value">ENUM</dt><dt class="value">ENUM_CONSTANT</dt><dt class="value">EXTENSION</dt><dt class="value">FIELD</dt><dd>
+      </dd><dt class="value">DYNAMIC_LOCAL_VARIABLE_DECLARATION</dt><dt class="value">DYNAMIC_LOCAL_VARIABLE_REFERENCE</dt><dt class="value">DYNAMIC_PARAMETER_DECLARATION</dt><dt class="value">DYNAMIC_PARAMETER_REFERENCE</dt><dt class="value">ENUM</dt><dt class="value">ENUM_CONSTANT</dt><dt class="value">EXTENSION</dt><dt class="value">EXTENSION_TYPE</dt><dt class="value">FIELD</dt><dd>
         
         <p>Deprecated - no longer sent.</p>
       </dd><dt class="value">FIELD_STATIC</dt><dd>
diff --git a/pkg/analyzer_plugin/lib/protocol/protocol_common.dart b/pkg/analyzer_plugin/lib/protocol/protocol_common.dart
index 4987b67ec1f..6ea6d24a8a1 100644
--- a/pkg/analyzer_plugin/lib/protocol/protocol_common.dart
+++ b/pkg/analyzer_plugin/lib/protocol/protocol_common.dart
@@ -1897,6 +1897,7 @@ class HighlightRegion implements HasToJson {
 ///   ENUM
 ///   ENUM_CONSTANT
 ///   EXTENSION
+///   EXTENSION_TYPE
 ///   FIELD
 ///   FIELD_STATIC
 ///   FUNCTION
@@ -2015,6 +2016,9 @@ class HighlightRegionType implements Enum {
   static const HighlightRegionType EXTENSION =
       HighlightRegionType._('EXTENSION');
 
+  static const HighlightRegionType EXTENSION_TYPE =
+      HighlightRegionType._('EXTENSION_TYPE');
+
   /// Deprecated - no longer sent.
   static const HighlightRegionType FIELD = HighlightRegionType._('FIELD');
 
@@ -2236,6 +2240,7 @@ class HighlightRegionType implements Enum {
     ENUM,
     ENUM_CONSTANT,
     EXTENSION,
+    EXTENSION_TYPE,
     FIELD,
     FIELD_STATIC,
     FUNCTION,
@@ -2344,6 +2349,8 @@ class HighlightRegionType implements Enum {
         return ENUM_CONSTANT;
       case 'EXTENSION':
         return EXTENSION;
+      case 'EXTENSION_TYPE':
+        return EXTENSION_TYPE;
       case 'FIELD':
         return FIELD;
       case 'FIELD_STATIC':
diff --git a/pkg/analyzer_plugin/test/integration/support/protocol_matchers.dart b/pkg/analyzer_plugin/test/integration/support/protocol_matchers.dart
index 1d38dbd229b..f2ea620ef41 100644
--- a/pkg/analyzer_plugin/test/integration/support/protocol_matchers.dart
+++ b/pkg/analyzer_plugin/test/integration/support/protocol_matchers.dart
@@ -382,6 +382,7 @@ final Matcher isHighlightRegion = LazyMatcher(() => MatchesJsonObject(
 ///   ENUM
 ///   ENUM_CONSTANT
 ///   EXTENSION
+///   EXTENSION_TYPE
 ///   FIELD
 ///   FIELD_STATIC
 ///   FUNCTION
@@ -466,6 +467,7 @@ final Matcher isHighlightRegionType = MatchesEnum('HighlightRegionType', [
   'ENUM',
   'ENUM_CONSTANT',
   'EXTENSION',
+  'EXTENSION_TYPE',
   'FIELD',
   'FIELD_STATIC',
   'FUNCTION',
diff --git a/pkg/analyzer_plugin/tool/spec/common_types_spec.html b/pkg/analyzer_plugin/tool/spec/common_types_spec.html
index e570bc46233..516886a30c7 100644
--- a/pkg/analyzer_plugin/tool/spec/common_types_spec.html
+++ b/pkg/analyzer_plugin/tool/spec/common_types_spec.html
@@ -736,6 +736,7 @@
       <value><code>ENUM</code></value>
       <value><code>ENUM_CONSTANT</code></value>
       <value><code>EXTENSION</code></value>
+      <value><code>EXTENSION_TYPE</code></value>
       <value>
         <code>FIELD</code>
         <p>Deprecated - no longer sent.</p>