diff --git a/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs b/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs
index 5eefe24556..2a469da63f 100644
--- a/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs
+++ b/src/Components/Components/ref/Microsoft.AspNetCore.Components.netstandard2.0.cs
@@ -71,7 +71,7 @@ namespace Microsoft.AspNetCore.Components
         public static System.Action<Microsoft.AspNetCore.Components.UIEventArgs> SetValueHandler(System.Action<string> setter, string existingValue) { throw null; }
         public static System.Action<Microsoft.AspNetCore.Components.UIEventArgs> SetValueHandler<T>(System.Action<T> setter, T existingValue) { throw null; }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false, Inherited=false)]
+    [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false, Inherited=true)]
     public sealed partial class CascadingParameterAttribute : System.Attribute
     {
         public CascadingParameterAttribute() { }
@@ -333,8 +333,8 @@ namespace Microsoft.AspNetCore.Components
     {
         System.Threading.Tasks.Task HandleEventAsync(Microsoft.AspNetCore.Components.EventCallbackWorkItem item, object arg);
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false)]
-    public partial class InjectAttribute : System.Attribute
+    [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false, Inherited=true)]
+    public sealed partial class InjectAttribute : System.Attribute
     {
         public InjectAttribute() { }
     }
@@ -371,7 +371,7 @@ namespace Microsoft.AspNetCore.Components
         public string Name { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } }
         public object Value { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false, Inherited=false)]
+    [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false, Inherited=true)]
     public sealed partial class ParameterAttribute : System.Attribute
     {
         public ParameterAttribute() { }
@@ -415,7 +415,7 @@ namespace Microsoft.AspNetCore.Components
         public void Render(Microsoft.AspNetCore.Components.RenderFragment renderFragment) { }
     }
     [System.AttributeUsageAttribute(System.AttributeTargets.Class, AllowMultiple=true, Inherited=false)]
-    public partial class RouteAttribute : System.Attribute
+    public sealed partial class RouteAttribute : System.Attribute
     {
         public RouteAttribute(string template) { }
         public string Template { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } }
@@ -660,7 +660,7 @@ namespace Microsoft.AspNetCore.Components.Forms
 namespace Microsoft.AspNetCore.Components.Layouts
 {
     [System.AttributeUsageAttribute(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)]
-    public partial class LayoutAttribute : System.Attribute
+    public sealed partial class LayoutAttribute : System.Attribute
     {
         public LayoutAttribute(System.Type layoutType) { }
         public System.Type LayoutType { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } }
diff --git a/src/Components/Components/src/CascadingParameterAttribute.cs b/src/Components/Components/src/CascadingParameterAttribute.cs
index f4855da312..ca8113976b 100644
--- a/src/Components/Components/src/CascadingParameterAttribute.cs
+++ b/src/Components/Components/src/CascadingParameterAttribute.cs
@@ -10,7 +10,7 @@ namespace Microsoft.AspNetCore.Components
     /// supplied by the closest ancestor <see cref="CascadingValue{T}"/> component that
     /// supplies values with a compatible type and name.
     /// </summary>
-    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
+    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
     public sealed class CascadingParameterAttribute : Attribute
     {
         /// <summary>
diff --git a/src/Components/Components/src/InjectAttribute.cs b/src/Components/Components/src/InjectAttribute.cs
index 3490c456ce..f18381fe9c 100644
--- a/src/Components/Components/src/InjectAttribute.cs
+++ b/src/Components/Components/src/InjectAttribute.cs
@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
@@ -9,8 +9,8 @@ namespace Microsoft.AspNetCore.Components
     /// Indicates that the associated property should have a value injected from the
     /// service provider during initialization.
     /// </summary>
-    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
-    public class InjectAttribute : Attribute
+    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
+    public sealed class InjectAttribute : Attribute
     {
     }
 }
diff --git a/src/Components/Components/src/Layouts/LayoutAttribute.cs b/src/Components/Components/src/Layouts/LayoutAttribute.cs
index 011d1b9924..ff722849cd 100644
--- a/src/Components/Components/src/Layouts/LayoutAttribute.cs
+++ b/src/Components/Components/src/Layouts/LayoutAttribute.cs
@@ -1,7 +1,6 @@
-// Copyright (c) .NET Foundation. All rights reserved.
+// Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Microsoft.AspNetCore.Components;
 using System;
 
 namespace Microsoft.AspNetCore.Components.Layouts
@@ -10,14 +9,8 @@ namespace Microsoft.AspNetCore.Components.Layouts
     /// Indicates that the associated component type uses a specified layout.
     /// </summary>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
-    public class LayoutAttribute : Attribute
+    public sealed class LayoutAttribute : Attribute
     {
-        /// <summary>
-        /// The type of the layout. The type myst implement <see cref="IComponent"/>
-        /// and must accept a parameter with the name 'Body'.
-        /// </summary>
-        public Type LayoutType { get; private set; }
-
         /// <summary>
         /// Constructs an instance of <see cref="LayoutAttribute"/>.
         /// </summary>
@@ -37,5 +30,11 @@ namespace Microsoft.AspNetCore.Components.Layouts
             // be a runtime error if the referenced component type rejects the 'Body' parameter
             // when it gets used.
         }
+
+        /// <summary>
+        /// The type of the layout. The type must implement <see cref="IComponent"/>
+        /// and must accept a parameter with the name 'Body'.
+        /// </summary>
+        public Type LayoutType { get; private set; }
     }
 }
diff --git a/src/Components/Components/src/ParameterAttribute.cs b/src/Components/Components/src/ParameterAttribute.cs
index afad81d525..25a0bed565 100644
--- a/src/Components/Components/src/ParameterAttribute.cs
+++ b/src/Components/Components/src/ParameterAttribute.cs
@@ -10,7 +10,7 @@ namespace Microsoft.AspNetCore.Components
     /// <summary>
     /// Denotes the target member as a component parameter.
     /// </summary>
-    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
+    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
     public sealed class ParameterAttribute : Attribute
     {
         /// <summary>
diff --git a/src/Components/Components/src/RouteAttribute.cs b/src/Components/Components/src/RouteAttribute.cs
index a503dab195..6e3214845b 100644
--- a/src/Components/Components/src/RouteAttribute.cs
+++ b/src/Components/Components/src/RouteAttribute.cs
@@ -9,7 +9,7 @@ namespace Microsoft.AspNetCore.Components
     /// Indicates that the associated component should match the specified route template pattern.
     /// </summary>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = false)]
-    public class RouteAttribute : Attribute
+    public sealed class RouteAttribute : Attribute
     {
         /// <summary>
         /// Constructs an instance of <see cref="RouteAttribute"/>.