diff --git a/modules/@angular/platform-browser/src/browser/title.ts b/modules/@angular/platform-browser/src/browser/title.ts
index 5c6880d57f..6cdf678f98 100644
--- a/modules/@angular/platform-browser/src/browser/title.ts
+++ b/modules/@angular/platform-browser/src/browser/title.ts
@@ -6,6 +6,8 @@ import {getDOM} from '../dom/dom_adapter';
  * it is not possible to bind to the `text` property of the `HTMLTitleElement` elements
  * (representing the `<title>` tag). Instead, this service can be used to set and get the current
  * title value.
+ *
+ * @experimental
  */
 export class Title {
   /**
diff --git a/modules/@angular/platform-browser/src/web_workers/shared/client_message_broker.ts b/modules/@angular/platform-browser/src/web_workers/shared/client_message_broker.ts
index bc8b8ab53a..a09b65a88e 100644
--- a/modules/@angular/platform-browser/src/web_workers/shared/client_message_broker.ts
+++ b/modules/@angular/platform-browser/src/web_workers/shared/client_message_broker.ts
@@ -7,6 +7,9 @@ import {DateWrapper, StringWrapper, isPresent, print, stringify} from '../../fac
 import {MessageBus} from './message_bus';
 import {Serializer} from './serializer';
 
+/**
+ * @experimental
+ */
 export abstract class ClientMessageBrokerFactory {
   /**
    * Initializes the given channel and attaches a new {@link ClientMessageBroker} to it.
@@ -32,6 +35,9 @@ export class ClientMessageBrokerFactory_ extends ClientMessageBrokerFactory {
   }
 }
 
+/**
+ * @experimental
+ */
 export abstract class ClientMessageBroker {
   abstract runOnService(args: UiArguments, returnType: Type): Promise<any>;
 }
@@ -148,10 +154,16 @@ class MessageData {
   }
 }
 
+/**
+ * @experimental
+ */
 export class FnArg {
   constructor(public value: any /** TODO #9100 */, public type: Type) {}
 }
 
+/**
+ * @experimental
+ */
 export class UiArguments {
   constructor(public method: string, public args?: FnArg[]) {}
 }
diff --git a/modules/@angular/platform-browser/src/web_workers/shared/message_bus.ts b/modules/@angular/platform-browser/src/web_workers/shared/message_bus.ts
index d5f478cd2f..ea01d14d66 100644
--- a/modules/@angular/platform-browser/src/web_workers/shared/message_bus.ts
+++ b/modules/@angular/platform-browser/src/web_workers/shared/message_bus.ts
@@ -8,6 +8,7 @@ import {EventEmitter} from '../../facade/async';
  * Communication is based on a channel abstraction. Messages published in a
  * given channel to one MessageBusSink are received on the same channel
  * by the corresponding MessageBusSource.
+ * @experimental
  */
 export abstract class MessageBus implements MessageBusSource, MessageBusSink {
   /**
@@ -41,6 +42,9 @@ export abstract class MessageBus implements MessageBusSource, MessageBusSink {
   abstract to(channel: string): EventEmitter<any>;
 }
 
+/**
+ * @experimental
+ */
 export interface MessageBusSource {
   /**
    * Sets up a new channel on the MessageBusSource.
@@ -64,6 +68,9 @@ export interface MessageBusSource {
   from(channel: string): EventEmitter<any>;
 }
 
+/**
+ * @experimental
+ */
 export interface MessageBusSink {
   /**
    * Sets up a new channel on the MessageBusSink.
diff --git a/modules/@angular/platform-browser/src/web_workers/shared/serializer.ts b/modules/@angular/platform-browser/src/web_workers/shared/serializer.ts
index 891f4ff2ae..29835bd75e 100644
--- a/modules/@angular/platform-browser/src/web_workers/shared/serializer.ts
+++ b/modules/@angular/platform-browser/src/web_workers/shared/serializer.ts
@@ -11,6 +11,9 @@ import {LocationType} from './serialized_types';
 
 // PRIMITIVE is any type that does not need to be serialized (string, number, boolean)
 // We set it to String so that it is considered a Type.
+/**
+ * @experimental
+ */
 export const PRIMITIVE: Type = String;
 
 @Injectable()
diff --git a/modules/@angular/platform-browser/src/web_workers/shared/service_message_broker.ts b/modules/@angular/platform-browser/src/web_workers/shared/service_message_broker.ts
index c9a67ea463..6781f4b897 100644
--- a/modules/@angular/platform-browser/src/web_workers/shared/service_message_broker.ts
+++ b/modules/@angular/platform-browser/src/web_workers/shared/service_message_broker.ts
@@ -29,6 +29,9 @@ export class ServiceMessageBrokerFactory_ extends ServiceMessageBrokerFactory {
   }
 }
 
+/**
+ * @experimental
+ */
 export abstract class ServiceMessageBroker {
   abstract registerMethod(
       methodName: string, signature: Type[], method: Function, returnType?: Type): void;
@@ -88,6 +91,9 @@ export class ServiceMessageBroker_ extends ServiceMessageBroker {
   }
 }
 
+/**
+ * @experimental
+ */
 export class ReceivedMessage {
   method: string;
   args: any[];
diff --git a/modules/@angular/platform-browser/src/web_workers/ui/location_providers.ts b/modules/@angular/platform-browser/src/web_workers/ui/location_providers.ts
index af94aa61dd..c0fb86867e 100644
--- a/modules/@angular/platform-browser/src/web_workers/ui/location_providers.ts
+++ b/modules/@angular/platform-browser/src/web_workers/ui/location_providers.ts
@@ -8,6 +8,7 @@ import {MessageBasedPlatformLocation} from './platform_location';
 /**
  * A list of {@link Provider}s. To use the router in a Worker enabled application you must
  * include these providers when setting up the render thread.
+ * @experimental
  */
 export const WORKER_UI_LOCATION_PROVIDERS = [
   MessageBasedPlatformLocation, BrowserPlatformLocation,
diff --git a/modules/@angular/platform-browser/src/web_workers/worker/location_providers.ts b/modules/@angular/platform-browser/src/web_workers/worker/location_providers.ts
index fdbd597b15..d9a3fa3ce7 100644
--- a/modules/@angular/platform-browser/src/web_workers/worker/location_providers.ts
+++ b/modules/@angular/platform-browser/src/web_workers/worker/location_providers.ts
@@ -7,6 +7,7 @@ import {WebWorkerPlatformLocation} from './platform_location';
 /**
  * Those providers should be added when the router is used in a worker context in addition to the
  * {@link ROUTER_PROVIDERS} and after them.
+ * @experimental
  */
 export const WORKER_APP_LOCATION_PROVIDERS = [
   {provide: PlatformLocation, useClass: WebWorkerPlatformLocation}, {
diff --git a/modules/@angular/platform-browser/src/worker_app.ts b/modules/@angular/platform-browser/src/worker_app.ts
index 17d840c519..1c370ed100 100644
--- a/modules/@angular/platform-browser/src/worker_app.ts
+++ b/modules/@angular/platform-browser/src/worker_app.ts
@@ -22,9 +22,15 @@ class PrintLogger {
 
 const WORKER_APP_PLATFORM_MARKER = new OpaqueToken('WorkerAppPlatformMarker');
 
+/**
+ * @experimental
+ */
 export const WORKER_APP_PLATFORM_PROVIDERS: Array<any /*Type | Provider | any[]*/> =
     [PLATFORM_COMMON_PROVIDERS, {provide: WORKER_APP_PLATFORM_MARKER, useValue: true}];
 
+/**
+ * @experimental
+ */
 export const WORKER_APP_APPLICATION_PROVIDERS: Array<any /*Type | Provider | any[]*/> = [
   APPLICATION_COMMON_PROVIDERS, FORM_PROVIDERS, BROWSER_SANITIZATION_PROVIDERS, Serializer,
   {provide: ClientMessageBrokerFactory, useClass: ClientMessageBrokerFactory_},
@@ -36,6 +42,9 @@ export const WORKER_APP_APPLICATION_PROVIDERS: Array<any /*Type | Provider | any
   {provide: APP_INITIALIZER, useValue: setupWebWorker, multi: true}
 ];
 
+/**
+ * @experimental
+ */
 export function workerAppPlatform(): PlatformRef {
   if (isBlank(getPlatform())) {
     createPlatform(ReflectiveInjector.resolveAndCreate(WORKER_APP_PLATFORM_PROVIDERS));
diff --git a/modules/@angular/platform-browser/src/worker_render.ts b/modules/@angular/platform-browser/src/worker_render.ts
index 33455206cc..575fcf82bb 100644
--- a/modules/@angular/platform-browser/src/worker_render.ts
+++ b/modules/@angular/platform-browser/src/worker_render.ts
@@ -29,6 +29,7 @@ const WORKER_RENDER_PLATFORM_MARKER = new OpaqueToken('WorkerRenderPlatformMarke
 /**
  * Wrapper class that exposes the Worker
  * and underlying {@link MessageBus} for lower level message passing.
+ * @experimental
  */
 @Injectable()
 export class WebWorkerInstance {
@@ -42,6 +43,9 @@ export class WebWorkerInstance {
   }
 }
 
+/**
+ * @experimental
+ */
 export const WORKER_SCRIPT: OpaqueToken = new OpaqueToken('WebWorkerScript');
 
 /**
@@ -49,15 +53,22 @@ export const WORKER_SCRIPT: OpaqueToken = new OpaqueToken('WebWorkerScript');
  * created.
  *
  * TODO(vicb): create an interface for startable services to implement
+ * @experimental
  */
 export const WORKER_UI_STARTABLE_MESSAGING_SERVICE =
     new OpaqueToken('WorkerRenderStartableMsgService');
 
+/**
+ * * @experimental
+ */
 export const WORKER_UI_PLATFORM_PROVIDERS: Array<any /*Type | Provider | any[]*/> = [
   PLATFORM_COMMON_PROVIDERS, {provide: WORKER_RENDER_PLATFORM_MARKER, useValue: true},
   {provide: PLATFORM_INITIALIZER, useValue: initWebWorkerRenderPlatform, multi: true}
 ];
 
+/**
+ * * @experimental
+ */
 export const WORKER_UI_APPLICATION_PROVIDERS: Array<any /*Type | Provider | any[]*/> = [
   APPLICATION_COMMON_PROVIDERS,
   MessageBasedRenderer,
@@ -108,6 +119,9 @@ function initWebWorkerRenderPlatform(): void {
   BrowserGetTestability.init();
 }
 
+/**
+ * * @experimental
+ */
 export function workerUiPlatform(): PlatformRef {
   if (isBlank(getPlatform())) {
     createPlatform(ReflectiveInjector.resolveAndCreate(WORKER_UI_PLATFORM_PROVIDERS));