diff --git a/components/constellation/constellation.rs b/components/constellation/constellation.rs
index db54290bf83b..5c9b52b7f72e 100644
--- a/components/constellation/constellation.rs
+++ b/components/constellation/constellation.rs
@@ -738,6 +738,12 @@ impl<Message, LTF, STF> Constellation<Message, LTF, STF>
                 // store service worker manager for communicating with it.
                 self.swmanager_chan = Some(sw_sender);
             }
+            SWManagerMsg::ConnectServiceWorker(scope_url, pipeline_id, msg_chan) => {
+                if let Some(ref parent_info) = self.pipelines.get(&pipeline_id) {
+                    let from_cons_msg = ConstellationControlMsg::ConnectServiceWorker(scope_url, msg_chan);
+                    let _ = parent_info.script_chan.send(from_cons_msg);
+                }
+            }
         }
     }
 
diff --git a/components/script/dom/bindings/structuredclone.rs b/components/script/dom/bindings/structuredclone.rs
index f9c4e98f2f9f..cb0fbce3092a 100644
--- a/components/script/dom/bindings/structuredclone.rs
+++ b/components/script/dom/bindings/structuredclone.rs
@@ -12,6 +12,7 @@ use js::jsapi::{JSContext, JS_ReadStructuredClone, JS_STRUCTURED_CLONE_VERSION};
 use js::jsapi::{JS_ClearPendingException, JS_WriteStructuredClone};
 use libc::size_t;
 use std::ptr;
+use std::slice;
 
 /// A buffer for a structured clone.
 pub struct StructuredCloneData {
@@ -45,6 +46,21 @@ impl StructuredCloneData {
         })
     }
 
+    /// Converts a StructuredCloneData to Vec<u64>
+    pub fn move_to_arraybuffer(self) -> Vec<u64> {
+        unsafe {
+            slice::from_raw_parts(self.data, self.nbytes).to_vec()
+        }
+    }
+
+    /// Converts back to StructuredCloneData using a pointer and no of bytes
+    pub fn make_structured_clone(data: *mut u64, nbytes: size_t) -> StructuredCloneData {
+        StructuredCloneData {
+            data: data,
+            nbytes: nbytes
+        }
+    }
+
     /// Reads a structured clone.
     ///
     /// Panics if `JS_ReadStructuredClone` fails.
diff --git a/components/script/dom/serviceworker.rs b/components/script/dom/serviceworker.rs
index 2b79be43dc85..5ae9025c7f12 100644
--- a/components/script/dom/serviceworker.rs
+++ b/components/script/dom/serviceworker.rs
@@ -2,20 +2,24 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::abstractworker::{SimpleWorkerErrorHandler, WorkerScriptMsg};
+use dom::abstractworker::SimpleWorkerErrorHandler;
 use dom::bindings::cell::DOMRefCell;
 use dom::bindings::codegen::Bindings::EventHandlerBinding::EventHandlerNonNull;
 use dom::bindings::codegen::Bindings::ServiceWorkerBinding::{ServiceWorkerMethods, ServiceWorkerState, Wrap};
+use dom::bindings::error::ErrorResult;
 use dom::bindings::global::GlobalRef;
 use dom::bindings::inheritance::Castable;
 use dom::bindings::js::Root;
 use dom::bindings::refcounted::Trusted;
 use dom::bindings::reflector::reflect_dom_object;
 use dom::bindings::str::USVString;
+use dom::bindings::structuredclone::StructuredCloneData;
 use dom::eventtarget::EventTarget;
+use ipc_channel::ipc::IpcSender;
+use js::jsapi::{HandleValue, JSContext};
 use script_thread::Runnable;
+use script_traits::DOMMessage;
 use std::cell::Cell;
-use std::sync::mpsc::Sender;
 use url::Url;
 
 pub type TrustedServiceWorkerAddress = Trusted<ServiceWorker>;
@@ -26,7 +30,7 @@ pub struct ServiceWorker {
     script_url: DOMRefCell<String>,
     state: Cell<ServiceWorkerState>,
     #[ignore_heap_size_of = "Defined in std"]
-    sender: Option<Sender<(TrustedServiceWorkerAddress, WorkerScriptMsg)>>,
+    msg_sender: DOMRefCell<Option<IpcSender<DOMMessage>>>,
     skip_waiting: Cell<bool>
 }
 
@@ -35,10 +39,10 @@ impl ServiceWorker {
                      skip_waiting: bool) -> ServiceWorker {
         ServiceWorker {
             eventtarget: EventTarget::new_inherited(),
-            sender: None,
             script_url: DOMRefCell::new(String::from(script_url)),
             state: Cell::new(ServiceWorkerState::Installing),
-            skip_waiting: Cell::new(skip_waiting)
+            skip_waiting: Cell::new(skip_waiting),
+            msg_sender: DOMRefCell::new(None)
         }
     }
 
@@ -69,6 +73,13 @@ impl ServiceWorker {
                            script_url.as_str(),
                            skip_waiting)
     }
+
+    pub fn store_sender(trusted_worker: TrustedServiceWorkerAddress, sender: IpcSender<DOMMessage>) {
+        let worker = trusted_worker.root();
+        // This channel is used for sending message from the ServiceWorker object to its
+        // corresponding ServiceWorkerGlobalScope
+        *worker.msg_sender.borrow_mut() = Some(sender);
+    }
 }
 
 impl ServiceWorkerMethods for ServiceWorker {
@@ -82,6 +93,18 @@ impl ServiceWorkerMethods for ServiceWorker {
         USVString(self.script_url.borrow().clone())
     }
 
+    // https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#service-worker-postmessage
+    fn PostMessage(&self, cx: *mut JSContext, message: HandleValue) -> ErrorResult {
+        let data = try!(StructuredCloneData::write(cx, message));
+        let msg_vec = DOMMessage(data.move_to_arraybuffer());
+        if let Some(ref sender) = *self.msg_sender.borrow() {
+            let _ = sender.send(msg_vec);
+        } else {
+            warn!("Could not communicate message to ServiceWorkerGlobalScope");
+        }
+        Ok(())
+    }
+
     // https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#service-worker-container-onerror-attribute
     event_handler!(error, GetOnerror, SetOnerror);
 
diff --git a/components/script/dom/serviceworkerglobalscope.rs b/components/script/dom/serviceworkerglobalscope.rs
index 3d26cbdb67f3..f9c95d9af537 100644
--- a/components/script/dom/serviceworkerglobalscope.rs
+++ b/components/script/dom/serviceworkerglobalscope.rs
@@ -5,7 +5,6 @@
 use devtools;
 use devtools_traits::DevtoolScriptControlMsg;
 use dom::abstractworker::WorkerScriptMsg;
-use dom::bindings::cell::DOMRefCell;
 use dom::bindings::codegen::Bindings::EventHandlerBinding::EventHandlerNonNull;
 use dom::bindings::codegen::Bindings::ServiceWorkerGlobalScopeBinding;
 use dom::bindings::codegen::Bindings::ServiceWorkerGlobalScopeBinding::ServiceWorkerGlobalScopeMethods;
@@ -14,9 +13,9 @@ use dom::bindings::inheritance::Castable;
 use dom::bindings::js::{Root, RootCollection};
 use dom::bindings::reflector::Reflectable;
 use dom::bindings::str::DOMString;
+use dom::bindings::structuredclone::StructuredCloneData;
 use dom::eventtarget::EventTarget;
 use dom::messageevent::MessageEvent;
-use dom::serviceworker::TrustedServiceWorkerAddress;
 use dom::workerglobalscope::WorkerGlobalScope;
 use ipc_channel::ipc::{self, IpcSender, IpcReceiver};
 use ipc_channel::router::ROUTER;
@@ -26,8 +25,8 @@ use js::rust::Runtime;
 use msg::constellation_msg::PipelineId;
 use net_traits::{LoadContext, load_whole_resource, IpcSend, CustomResponseMediator};
 use rand::random;
-use script_runtime::{CommonScriptMsg, StackRootTLS, get_reports, new_rt_and_cx};
-use script_traits::{TimerEvent, WorkerGlobalScopeInit, ScopeThings, ServiceWorkerMsg};
+use script_runtime::{CommonScriptMsg, StackRootTLS, get_reports, new_rt_and_cx, ScriptChan};
+use script_traits::{TimerEvent, WorkerGlobalScopeInit, ScopeThings, ServiceWorkerMsg, DOMMessage};
 use std::sync::mpsc::{Receiver, RecvError, Select, Sender, channel};
 use std::thread;
 use std::time::Duration;
@@ -49,6 +48,27 @@ pub enum MixedMessage {
     FromServiceWorker(ServiceWorkerScriptMsg),
     FromDevtools(DevtoolScriptControlMsg),
     FromTimeoutThread(()),
+    PostMessage(DOMMessage)
+}
+
+// Required for run_with_memory_reporting
+#[derive(JSTraceable, Clone)]
+pub struct ServiceWorkerChan {
+    pub sender: Sender<ServiceWorkerScriptMsg>
+}
+
+impl ScriptChan for ServiceWorkerChan {
+    fn send(&self, msg: CommonScriptMsg) -> Result<(), ()> {
+        self.sender
+            .send(ServiceWorkerScriptMsg::CommonWorker(WorkerScriptMsg::Common(msg)))
+            .map_err(|_| ())
+    }
+
+    fn clone(&self) -> Box<ScriptChan + Send> {
+        box ServiceWorkerChan {
+            sender: self.sender.clone(),
+        }
+    }
 }
 
 #[dom_struct]
@@ -61,12 +81,12 @@ pub struct ServiceWorkerGlobalScope {
     own_sender: Sender<ServiceWorkerScriptMsg>,
     #[ignore_heap_size_of = "Defined in std"]
     timer_event_port: Receiver<()>,
-    #[ignore_heap_size_of = "Trusted<T> has unclear ownership like JS<T>"]
-    worker: DOMRefCell<Option<TrustedServiceWorkerAddress>>,
     #[ignore_heap_size_of = "Defined in std"]
     swmanager_sender: IpcSender<ServiceWorkerMsg>,
     #[ignore_heap_size_of = "Defined in std"]
-    scope_url: Url
+    msg_port: Receiver<DOMMessage>,
+    #[ignore_heap_size_of = "Defined in std"]
+    scope_url: Url,
 }
 
 impl ServiceWorkerGlobalScope {
@@ -80,7 +100,8 @@ impl ServiceWorkerGlobalScope {
                      timer_event_chan: IpcSender<TimerEvent>,
                      timer_event_port: Receiver<()>,
                      swmanager_sender: IpcSender<ServiceWorkerMsg>,
-                     scope_url: Url)
+                     scope_url: Url,
+                     msg_port: Receiver<DOMMessage>)
                      -> ServiceWorkerGlobalScope {
         ServiceWorkerGlobalScope {
             workerglobalscope: WorkerGlobalScope::new_inherited(init,
@@ -93,9 +114,9 @@ impl ServiceWorkerGlobalScope {
             receiver: receiver,
             timer_event_port: timer_event_port,
             own_sender: own_sender,
-            worker: DOMRefCell::new(None),
             swmanager_sender: swmanager_sender,
-            scope_url: scope_url
+            scope_url: scope_url,
+            msg_port: msg_port
         }
     }
 
@@ -109,7 +130,8 @@ impl ServiceWorkerGlobalScope {
                timer_event_chan: IpcSender<TimerEvent>,
                timer_event_port: Receiver<()>,
                swmanager_sender: IpcSender<ServiceWorkerMsg>,
-               scope_url: Url)
+               scope_url: Url,
+               msg_port: Receiver<DOMMessage>)
                -> Root<ServiceWorkerGlobalScope> {
         let cx = runtime.cx();
         let scope = box ServiceWorkerGlobalScope::new_inherited(init,
@@ -122,7 +144,8 @@ impl ServiceWorkerGlobalScope {
                                                                   timer_event_chan,
                                                                   timer_event_port,
                                                                   swmanager_sender,
-                                                                  scope_url);
+                                                                  scope_url,
+                                                                  msg_port);
         ServiceWorkerGlobalScopeBinding::Wrap(cx, scope)
     }
 
@@ -132,7 +155,8 @@ impl ServiceWorkerGlobalScope {
                             receiver: Receiver<ServiceWorkerScriptMsg>,
                             devtools_receiver: IpcReceiver<DevtoolScriptControlMsg>,
                             swmanager_sender: IpcSender<ServiceWorkerMsg>,
-                            scope_url: Url) {
+                            scope_url: Url,
+                            msg_port: Receiver<DOMMessage>) {
         let ScopeThings { script_url,
                           pipeline_id,
                           init,
@@ -167,7 +191,7 @@ impl ServiceWorkerGlobalScope {
             let global = ServiceWorkerGlobalScope::new(
                 init, url, pipeline_id, devtools_mpsc_port, runtime,
                 own_sender, receiver,
-                timer_ipc_chan, timer_port, swmanager_sender, scope_url);
+                timer_ipc_chan, timer_port, swmanager_sender, scope_url, msg_port);
             let scope = global.upcast::<WorkerGlobalScope>();
 
             unsafe {
@@ -214,6 +238,17 @@ impl ServiceWorkerGlobalScope {
                 self.handle_script_event(msg);
                 true
             }
+            MixedMessage::PostMessage(data) => {
+                let DOMMessage(mut data) = data;
+                let data = StructuredCloneData::make_structured_clone(data.as_mut_ptr(), data.len());
+                let scope = self.upcast::<WorkerGlobalScope>();
+                let target = self.upcast();
+                let _ac = JSAutoCompartment::new(scope.get_cx(), scope.reflector().get_jsobject().get());
+                rooted!(in(scope.get_cx()) let mut message = UndefinedValue());
+                data.read(GlobalRef::Worker(scope), message.handle_mut());
+                MessageEvent::dispatch_jsval(target, GlobalRef::Worker(scope), message.handle());
+                true
+            }
             MixedMessage::FromTimeoutThread(_) => {
                 let _ = self.swmanager_sender.send(ServiceWorkerMsg::Timeout(self.scope_url.clone()));
                 false
@@ -225,15 +260,7 @@ impl ServiceWorkerGlobalScope {
         use self::ServiceWorkerScriptMsg::*;
 
         match msg {
-            CommonWorker(WorkerScriptMsg::DOMMessage(data)) => {
-                let scope = self.upcast::<WorkerGlobalScope>();
-                let target = self.upcast();
-                let _ac = JSAutoCompartment::new(scope.get_cx(),
-                                                 scope.reflector().get_jsobject().get());
-                rooted!(in(scope.get_cx()) let mut message = UndefinedValue());
-                data.read(GlobalRef::Worker(scope), message.handle_mut());
-                MessageEvent::dispatch_jsval(target, GlobalRef::Worker(scope), message.handle());
-            },
+            CommonWorker(WorkerScriptMsg::DOMMessage(_)) => { },
             CommonWorker(WorkerScriptMsg::Common(CommonScriptMsg::RunnableMsg(_, runnable))) => {
                 runnable.handler()
             },
@@ -260,17 +287,20 @@ impl ServiceWorkerGlobalScope {
         let worker_port = &self.receiver;
         let devtools_port = scope.from_devtools_receiver();
         let timer_event_port = &self.timer_event_port;
+        let msg_port = &self.msg_port;
 
         let sel = Select::new();
         let mut worker_handle = sel.handle(worker_port);
         let mut devtools_handle = sel.handle(devtools_port);
         let mut timer_port_handle = sel.handle(timer_event_port);
+        let mut msg_port_handle = sel.handle(msg_port);
         unsafe {
             worker_handle.add();
             if scope.from_devtools_sender().is_some() {
                 devtools_handle.add();
             }
             timer_port_handle.add();
+            msg_port_handle.add();
         }
 
         let ret = sel.wait();
@@ -280,6 +310,8 @@ impl ServiceWorkerGlobalScope {
             Ok(MixedMessage::FromDevtools(try!(devtools_port.recv())))
         } else if ret == timer_port_handle.id() {
             Ok(MixedMessage::FromTimeoutThread(try!(timer_event_port.recv())))
+        } else if ret == msg_port_handle.id() {
+            Ok(MixedMessage::PostMessage(try!(msg_port.recv())))
         } else {
             panic!("unexpected select result!")
         }
@@ -292,6 +324,12 @@ impl ServiceWorkerGlobalScope {
     pub fn process_event(&self, msg: CommonScriptMsg) {
         self.handle_script_event(ServiceWorkerScriptMsg::CommonWorker(WorkerScriptMsg::Common(msg)));
     }
+
+    pub fn script_chan(&self) -> Box<ScriptChan + Send> {
+        box ServiceWorkerChan {
+            sender: self.own_sender.clone()
+        }
+    }
 }
 
 #[allow(unsafe_code)]
diff --git a/components/script/dom/serviceworkerregistration.rs b/components/script/dom/serviceworkerregistration.rs
index e20b7e06c478..bb44c1e2f783 100644
--- a/components/script/dom/serviceworkerregistration.rs
+++ b/components/script/dom/serviceworkerregistration.rs
@@ -6,10 +6,11 @@ use dom::bindings::codegen::Bindings::ServiceWorkerBinding::ServiceWorkerState;
 use dom::bindings::codegen::Bindings::ServiceWorkerRegistrationBinding::{ServiceWorkerRegistrationMethods, Wrap};
 use dom::bindings::global::GlobalRef;
 use dom::bindings::js::{JS, Root};
+use dom::bindings::refcounted::Trusted;
 use dom::bindings::reflector::reflect_dom_object;
 use dom::bindings::str::USVString;
 use dom::eventtarget::EventTarget;
-use dom::serviceworker::ServiceWorker;
+use dom::serviceworker::{ServiceWorker, TrustedServiceWorkerAddress};
 use dom::serviceworkercontainer::Controllable;
 use dom::workerglobalscope::prepare_workerscope_init;
 use script_traits::{WorkerScriptLoadOrigin, ScopeThings};
@@ -49,6 +50,10 @@ impl ServiceWorkerRegistration {
         self.active.as_ref().unwrap()
     }
 
+    pub fn get_trusted_worker(&self) -> TrustedServiceWorkerAddress {
+        Trusted::new(self.active.as_ref().unwrap())
+    }
+
     pub fn create_scope_things(global: GlobalRef, script_url: Url) -> ScopeThings {
         let worker_load_origin = WorkerScriptLoadOrigin {
             referrer_url: None,
diff --git a/components/script/dom/webidls/ServiceWorker.webidl b/components/script/dom/webidls/ServiceWorker.webidl
index efea6603c3ff..0d0855f4239c 100644
--- a/components/script/dom/webidls/ServiceWorker.webidl
+++ b/components/script/dom/webidls/ServiceWorker.webidl
@@ -7,7 +7,7 @@
 interface ServiceWorker : EventTarget {
   readonly attribute USVString scriptURL;
   readonly attribute ServiceWorkerState state;
-  //[Throws] void postMessage(any message/*, optional sequence<Transferable> transfer*/);
+  [Throws] void postMessage(any message/*, optional sequence<Transferable> transfer*/);
 
   // event
   attribute EventHandler onstatechange;
diff --git a/components/script/dom/workerglobalscope.rs b/components/script/dom/workerglobalscope.rs
index 9f61753ca644..993321093b25 100644
--- a/components/script/dom/workerglobalscope.rs
+++ b/components/script/dom/workerglobalscope.rs
@@ -392,10 +392,12 @@ impl WorkerGlobalScope {
     }
 
     pub fn script_chan(&self) -> Box<ScriptChan + Send> {
-        let dedicated =
-            self.downcast::<DedicatedWorkerGlobalScope>();
+        let dedicated = self.downcast::<DedicatedWorkerGlobalScope>();
+        let service_worker = self.downcast::<ServiceWorkerGlobalScope>();
         if let Some(dedicated) = dedicated {
             return dedicated.script_chan();
+        } else if let Some(service_worker) = service_worker {
+            return service_worker.script_chan();
         } else {
             panic!("need to implement a sender for SharedWorker/ServiceWorker")
         }
diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index ac6165d5c4f5..fb5abc005d89 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -42,7 +42,7 @@ use dom::element::Element;
 use dom::event::{Event, EventBubbles, EventCancelable};
 use dom::htmlanchorelement::HTMLAnchorElement;
 use dom::node::{Node, NodeDamage, window_from_node};
-use dom::serviceworker::TrustedServiceWorkerAddress;
+use dom::serviceworker::{TrustedServiceWorkerAddress, ServiceWorker};
 use dom::serviceworkerregistration::ServiceWorkerRegistration;
 use dom::servohtmlparser::ParserContext;
 use dom::uievent::UIEvent;
@@ -84,7 +84,7 @@ use script_traits::CompositorEvent::{TouchEvent, TouchpadPressureEvent};
 use script_traits::webdriver_msg::WebDriverScriptCommand;
 use script_traits::{CompositorEvent, ConstellationControlMsg, EventResult};
 use script_traits::{InitialScriptState, MouseButton, MouseEventType, MozBrowserEvent};
-use script_traits::{NewLayoutInfo, ScriptMsg as ConstellationMsg};
+use script_traits::{NewLayoutInfo, ScriptMsg as ConstellationMsg, DOMMessage};
 use script_traits::{ScriptThreadFactory, TimerEvent, TimerEventRequest, TimerSource};
 use script_traits::{TouchEventType, TouchId, UntrustedNodeAddress, WindowSizeData};
 use std::borrow::ToOwned;
@@ -924,6 +924,8 @@ impl ScriptThread {
                 self.handle_css_error_reporting(pipeline_id, filename, line, column, msg),
             ConstellationControlMsg::Reload(pipeline_id) =>
                 self.handle_reload(pipeline_id),
+            ConstellationControlMsg::ConnectServiceWorker(scope_url, chan) =>
+                self.connect_serviceworker_to_scope(scope_url, chan),
             msg @ ConstellationControlMsg::AttachLayout(..) |
             msg @ ConstellationControlMsg::Viewport(..) |
             msg @ ConstellationControlMsg::SetScrollState(..) |
@@ -1456,7 +1458,16 @@ impl ScriptThread {
             let scope_things = ServiceWorkerRegistration::create_scope_things(global_ref, script_url);
             let _ = self.constellation_chan.send(ConstellationMsg::RegisterServiceWorker(scope_things, scope));
         } else {
-            warn!("Registration failed for {}", pipeline_id);
+            warn!("Registration failed for {}", scope);
+        }
+    }
+
+    // Set the sender to the corresponding scope of the service worker object.
+    fn connect_serviceworker_to_scope(&self, scope_url: Url, chan: IpcSender<DOMMessage>) {
+        let ref maybe_registration_ref = *self.registration_map.borrow();
+        if let Some(ref registration) = maybe_registration_ref.get(&scope_url) {
+            let trusted_worker = registration.get_trusted_worker();
+            ServiceWorker::store_sender(trusted_worker, chan);
         }
     }
 
diff --git a/components/script/serviceworker_manager.rs b/components/script/serviceworker_manager.rs
index 09f5288929a4..898bd2b63f30 100644
--- a/components/script/serviceworker_manager.rs
+++ b/components/script/serviceworker_manager.rs
@@ -35,19 +35,23 @@ pub struct ServiceWorkerManager {
     // receiver to receive messages from constellation
     own_port: Receiver<ServiceWorkerMsg>,
     // to receive resource messages
-    resource_receiver: Receiver<CustomResponseMediator>
+    resource_receiver: Receiver<CustomResponseMediator>,
+    // to send message to constellation
+    constellation_sender: IpcSender<SWManagerMsg>
 }
 
 impl ServiceWorkerManager {
     fn new(own_sender: IpcSender<ServiceWorkerMsg>,
            from_constellation_receiver: Receiver<ServiceWorkerMsg>,
-           resource_port: Receiver<CustomResponseMediator>) -> ServiceWorkerManager {
+           resource_port: Receiver<CustomResponseMediator>,
+           constellation_sender: IpcSender<SWManagerMsg>) -> ServiceWorkerManager {
         ServiceWorkerManager {
             registered_workers: HashMap::new(),
             active_workers: HashMap::new(),
             own_sender: own_sender,
             own_port: from_constellation_receiver,
-            resource_receiver: resource_port
+            resource_receiver: resource_port,
+            constellation_sender: constellation_sender
         }
     }
 
@@ -58,8 +62,12 @@ impl ServiceWorkerManager {
         let resource_port = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(resource_port);
         let _ = sw_senders.resource_sender.send(CoreResourceMsg::NetworkMediator(resource_chan));
         let _ = sw_senders.swmanager_sender.send(SWManagerMsg::OwnSender(own_sender.clone()));
+        let constellation_sender = sw_senders.swmanager_sender.clone();
         spawn_named("ServiceWorkerManager".to_owned(), move || {
-            ServiceWorkerManager::new(own_sender, from_constellation, resource_port).handle_message();
+            ServiceWorkerManager::new(own_sender,
+                                      from_constellation,
+                                      resource_port,
+                                      constellation_sender).handle_message();
         });
     }
 
@@ -93,12 +101,20 @@ impl ServiceWorkerManager {
                                                                              devtools_sender.clone(),
                                                                              page_info));
                 };
+                let (msg_chan, msg_port) = ipc::channel().unwrap();
+                let msg_port = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(msg_port);
                 ServiceWorkerGlobalScope::run_serviceworker_scope(scope_things.clone(),
-                                                                              sender.clone(),
-                                                                              receiver,
-                                                                              devtools_receiver,
-                                                                              self.own_sender.clone(),
-                                                                              scope_url.clone());
+                                                                  sender.clone(),
+                                                                  receiver,
+                                                                  devtools_receiver,
+                                                                  self.own_sender.clone(),
+                                                                  scope_url.clone(),
+                                                                  msg_port);
+                // Send the message to constellation which then talks to the script thread for storing this msg_chan
+                let connection_msg = SWManagerMsg::ConnectServiceWorker(scope_url.clone(),
+                                                                        scope_things.pipeline_id,
+                                                                        msg_chan);
+                let _ = self.constellation_sender.send(connection_msg);
                 // We store the activated worker
                 self.active_workers.insert(scope_url, scope_things.clone());
                 return Some(sender);
diff --git a/components/script_traits/lib.rs b/components/script_traits/lib.rs
index 897f20bb3b29..ce708fd34ab1 100644
--- a/components/script_traits/lib.rs
+++ b/components/script_traits/lib.rs
@@ -71,7 +71,7 @@ use util::ipc::OptionalOpaqueIpcSender;
 use webdriver_msg::{LoadStatus, WebDriverScriptCommand};
 
 pub use script_msg::{LayoutMsg, ScriptMsg, EventResult, LogEntry};
-pub use script_msg::{ServiceWorkerMsg, ScopeThings, SWManagerMsg, SWManagerSenders};
+pub use script_msg::{ServiceWorkerMsg, ScopeThings, SWManagerMsg, SWManagerSenders, DOMMessage};
 
 /// The address of a node. Layout sends these back. They must be validated via
 /// `from_untrusted_node_address` before they can be used, because we do not trust layout.
@@ -208,6 +208,8 @@ pub enum ConstellationControlMsg {
     ReportCSSError(PipelineId, String, usize, usize, String),
     /// Reload the given page.
     Reload(PipelineId),
+    /// Requests the script thread to connect service worker object to its scope
+    ConnectServiceWorker(Url, IpcSender<DOMMessage>)
 }
 
 impl fmt::Debug for ConstellationControlMsg {
@@ -237,6 +239,7 @@ impl fmt::Debug for ConstellationControlMsg {
             FramedContentChanged(..) => "FramedContentChanged",
             ReportCSSError(..) => "ReportCSSError",
             Reload(..) => "Reload",
+            ConnectServiceWorker(..) => "ConnectServiceWorker"
         })
     }
 }
diff --git a/components/script_traits/script_msg.rs b/components/script_traits/script_msg.rs
index d183336f6f8b..b1a9f2e6a522 100644
--- a/components/script_traits/script_msg.rs
+++ b/components/script_traits/script_msg.rs
@@ -158,6 +158,10 @@ pub struct ScopeThings {
     pub worker_id: WorkerId,
 }
 
+/// Message that gets passed to service worker scope on postMessage
+#[derive(Deserialize, Serialize, Debug)]
+pub struct DOMMessage(pub Vec<u64>);
+
 /// Channels to allow service worker manager to communicate with constellation and resource thread
 pub struct SWManagerSenders {
     /// sender for communicating with constellation
@@ -182,4 +186,7 @@ pub enum ServiceWorkerMsg {
 pub enum SWManagerMsg {
     /// Provide the constellation with a means of communicating with the Service Worker Manager
     OwnSender(IpcSender<ServiceWorkerMsg>),
+    /// Message to ask to get a Trusted<ServiceWorker> to constellation
+    ConnectServiceWorker(Url, PipelineId, IpcSender<DOMMessage>)
+
 }
diff --git a/tests/html/service-worker/iframe_sw.js b/tests/html/service-worker/iframe_sw.js
index d9c76b8d6f12..51bce022ffe8 100644
--- a/tests/html/service-worker/iframe_sw.js
+++ b/tests/html/service-worker/iframe_sw.js
@@ -4,4 +4,8 @@ self.addEventListener('activate', function(e) {
 
 self.addEventListener('fetch', function(e) {
 	console.log("A fetch event detected by /iframe service worker");
-});
\ No newline at end of file
+});
+
+self.addEventListener('message', function(e) {
+	console.log('Post message payload ' + e.data.msg);
+})
diff --git a/tests/html/service-worker/index.html b/tests/html/service-worker/index.html
index a20fcbb67e4c..72081e62a2d1 100644
--- a/tests/html/service-worker/index.html
+++ b/tests/html/service-worker/index.html
@@ -23,6 +23,13 @@
     console.log("From client worker registered: ", navigator.serviceWorker.controller);
     console.log("Registered script source: "+ navigator.serviceWorker.controller.scriptURL);
     document.getElementById('iframe_sw').src = 'demo_iframe.html';
+    var payload = { msg: 'Hi from /iframe service worker' };
+
+    // The delay is due to the sender being set in the service worker object after the scope starts.
+    // This won't be needed when service workers are wrapped with Promises.
+    setTimeout(function() {
+        navigator.serviceWorker.controller.postMessage(payload);
+    }, 1000);
 
     function register_zero() {
         var reg = navigator.serviceWorker.register('sw.js', { 'scope': './' });