diff --git a/components/script/document_loader.rs b/components/script/document_loader.rs
index 6761f175a3f..e5bcdbc978a 100644
--- a/components/script/document_loader.rs
+++ b/components/script/document_loader.rs
@@ -8,6 +8,7 @@
 
 use dom::bindings::root::Dom;
 use dom::document::Document;
+use fetch::FetchCanceller;
 use ipc_channel::ipc::IpcSender;
 use net_traits::{CoreResourceMsg, FetchChannels, FetchResponseMsg};
 use net_traits::{ResourceThreads, IpcSend};
@@ -87,6 +88,7 @@ pub struct DocumentLoader {
     resource_threads: ResourceThreads,
     blocking_loads: Vec<LoadType>,
     events_inhibited: bool,
+    cancellers: Vec<FetchCanceller>,
 }
 
 impl DocumentLoader {
@@ -103,9 +105,17 @@ impl DocumentLoader {
             resource_threads: resource_threads,
             blocking_loads: initial_loads,
             events_inhibited: false,
+            cancellers: Vec::new()
         }
     }
 
+    pub fn cancel_all_loads(&mut self) -> bool {
+        let canceled_any = !self.cancellers.is_empty();
+        // Associated fetches will be canceled when dropping the canceller.
+        self.cancellers.clear();
+        canceled_any
+    }
+
     /// Add a load to the list of blocking loads.
     fn add_blocking_load(&mut self, load: LoadType) {
         debug!("Adding blocking load {:?} ({}).", load, self.blocking_loads.len());
@@ -122,11 +132,14 @@ impl DocumentLoader {
     }
 
     /// Initiate a new fetch that does not block the document load event.
-    pub fn fetch_async_background(&self,
+    pub fn fetch_async_background(&mut self,
                                   request: RequestInit,
                                   fetch_target: IpcSender<FetchResponseMsg>) {
+        let mut canceller = FetchCanceller::new();
+        let cancel_receiver = canceller.initialize();
+        self.cancellers.push(canceller);
         self.resource_threads.sender().send(
-            CoreResourceMsg::Fetch(request, FetchChannels::ResponseMsg(fetch_target, None))).unwrap();
+            CoreResourceMsg::Fetch(request, FetchChannels::ResponseMsg(fetch_target, Some(cancel_receiver)))).unwrap();
     }
 
     /// Mark an in-progress network request complete.
diff --git a/components/script/dom/bindings/codegen/Bindings.conf b/components/script/dom/bindings/codegen/Bindings.conf
index 2f0b8e7b66b..b97d199147b 100644
--- a/components/script/dom/bindings/codegen/Bindings.conf
+++ b/components/script/dom/bindings/codegen/Bindings.conf
@@ -26,6 +26,10 @@ DOMInterfaces = {
     'weakReferenceable': True,
 },
 
+'EventSource': {
+    'weakReferenceable': True,
+},
+
 #FIXME(jdm): This should be 'register': False, but then we don't generate enum types
 'TestBinding': {},
 
diff --git a/components/script/dom/bindings/weakref.rs b/components/script/dom/bindings/weakref.rs
index e4e5f00103f..abb1e07bc08 100644
--- a/components/script/dom/bindings/weakref.rs
+++ b/components/script/dom/bindings/weakref.rs
@@ -11,6 +11,7 @@
 //! slot. When all associated `WeakRef` values are dropped, the
 //! `WeakBox` itself is dropped too.
 
+use dom::bindings::cell::DomRefCell;
 use dom::bindings::reflector::DomObject;
 use dom::bindings::root::DomRoot;
 use dom::bindings::trace::JSTraceable;
@@ -286,3 +287,34 @@ impl<'a, T: WeakReferenceable + 'a> Drop for WeakRefEntry<'a, T> {
         *self.index += 1;
     }
 }
+
+#[derive(MallocSizeOf)]
+pub struct DOMTracker<T: WeakReferenceable> {
+    dom_objects: DomRefCell<WeakRefVec<T>>
+}
+
+impl<T: WeakReferenceable> DOMTracker<T> {
+    pub fn new() -> Self {
+        Self {
+            dom_objects: DomRefCell::new(WeakRefVec::new())
+        }
+    }
+
+    pub fn track(&self, dom_object: &T) {
+        self.dom_objects.borrow_mut().push(WeakRef::new(dom_object));
+    }
+
+    pub fn for_each<F: FnMut(DomRoot<T>)>(&self, mut f: F) {
+        self.dom_objects.borrow_mut().update(|weak_ref| {
+            let root = weak_ref.root().unwrap();
+            f(root);
+        });
+    }
+}
+
+#[allow(unsafe_code)]
+unsafe impl<T: WeakReferenceable> JSTraceable for DOMTracker<T> {
+    unsafe fn trace(&self, _: *mut JSTracer) {
+        self.dom_objects.borrow_mut().retain_alive();
+    }
+}
diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index 26c59bdb8ec..5394089d220 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -141,7 +141,7 @@ use style::shared_lock::{SharedRwLock as StyleSharedRwLock, SharedRwLockReadGuar
 use style::str::{split_html_space_chars, str_join};
 use style::stylesheet_set::DocumentStylesheetSet;
 use style::stylesheets::{CssRule, Stylesheet, Origin, OriginSet};
-use task_source::TaskSource;
+use task_source::{TaskSource, TaskSourceName};
 use time;
 use timers::OneshotTimerCallback;
 use url::Host;
@@ -1765,8 +1765,11 @@ impl Document {
         // Step 10, 14
         if !self.salvageable.get() {
             // https://html.spec.whatwg.org/multipage/#unloading-document-cleanup-steps
+            let global_scope = self.window.upcast::<GlobalScope>();
+            // Step 1 of clean-up steps.
+            global_scope.close_event_sources();
             let msg = ScriptMsg::DiscardDocument;
-            let _ = self.window.upcast::<GlobalScope>().script_to_constellation_chan().send(msg);
+            let _ = global_scope.script_to_constellation_chan().send(msg);
         }
         // Step 15, End
         self.decr_ignore_opens_during_unload_counter();
@@ -2010,7 +2013,7 @@ impl Document {
     }
 
     // https://html.spec.whatwg.org/multipage/#abort-a-document
-    fn abort(&self) {
+    pub fn abort(&self) {
         // We need to inhibit the loader before anything else.
         self.loader.borrow_mut().inhibit_events();
 
@@ -2029,14 +2032,24 @@ impl Document {
         *self.asap_scripts_set.borrow_mut() = vec![];
         self.asap_in_order_scripts_list.clear();
         self.deferred_scripts.clear();
+        let global_scope = self.window.upcast::<GlobalScope>();
+        let loads_cancelled = self.loader.borrow_mut().cancel_all_loads();
+        let event_sources_canceled = global_scope.close_event_sources();
+        if loads_cancelled || event_sources_canceled {
+            // If any loads were canceled.
+            self.salvageable.set(false);
+        };
 
-        // TODO: https://github.com/servo/servo/issues/15236
-        self.window.cancel_all_tasks();
+        // Also Step 2.
+        // Note: the spec says to discard any tasks queued for fetch.
+        // This cancels all tasks on the networking task source, which might be too broad.
+        // See https://github.com/whatwg/html/issues/3837
+        self.window.cancel_all_tasks_from_source(TaskSourceName::Networking);
 
         // Step 3.
         if let Some(parser) = self.get_current_parser() {
             parser.abort();
-            // TODO: salvageable flag.
+            self.salvageable.set(false);
         }
     }
 
@@ -3917,7 +3930,7 @@ impl DocumentMethods for Document {
             return Err(Error::Security);
         }
 
-        if self.get_current_parser().map_or(false, |parser| parser.script_nesting_level() > 0) {
+        if self.get_current_parser().map_or(false, |parser| parser.is_active()) {
             // Step 5.
             return Ok(DomRoot::from_ref(self));
         }
diff --git a/components/script/dom/eventsource.rs b/components/script/dom/eventsource.rs
index 48b762978ca..072a3dd0080 100644
--- a/components/script/dom/eventsource.rs
+++ b/components/script/dom/eventsource.rs
@@ -16,6 +16,7 @@ use dom::globalscope::GlobalScope;
 use dom::messageevent::MessageEvent;
 use dom_struct::dom_struct;
 use euclid::Length;
+use fetch::FetchCanceller;
 use hyper::header::{Accept, qitem};
 use ipc_channel::ipc;
 use ipc_channel::router::ROUTER;
@@ -64,6 +65,7 @@ pub struct EventSource {
 
     ready_state: Cell<ReadyState>,
     with_credentials: bool,
+    canceller: DomRefCell<FetchCanceller>,
 }
 
 enum ParserState {
@@ -118,19 +120,7 @@ impl EventSourceContext {
         if self.gen_id != event_source.generation_id.get() {
             return;
         }
-        let global = event_source.global();
-        let event_source = self.event_source.clone();
-        // FIXME(nox): Why are errors silenced here?
-        let _ = global.remote_event_task_source().queue(
-            task!(fail_the_event_source_connection: move || {
-                let event_source = event_source.root();
-                if event_source.ready_state.get() != ReadyState::Closed {
-                    event_source.ready_state.set(ReadyState::Closed);
-                    event_source.upcast::<EventTarget>().fire_event(atom!("error"));
-                }
-            }),
-            &global,
-        );
+        event_source.fail_the_connection();
     }
 
     // https://html.spec.whatwg.org/multipage/#reestablish-the-connection
@@ -410,6 +400,7 @@ impl EventSource {
 
             ready_state: Cell::new(ReadyState::Connecting),
             with_credentials: with_credentials,
+            canceller: DomRefCell::new(Default::default())
         }
     }
 
@@ -419,6 +410,29 @@ impl EventSource {
                            Wrap)
     }
 
+    // https://html.spec.whatwg.org/multipage/#sse-processing-model:fail-the-connection-3
+    pub fn cancel(&self) {
+        self.canceller.borrow_mut().cancel();
+        self.fail_the_connection();
+    }
+
+    /// <https://html.spec.whatwg.org/multipage/#fail-the-connection>
+    pub fn fail_the_connection(&self) {
+        let global = self.global();
+        let event_source = Trusted::new(self);
+        // FIXME(nox): Why are errors silenced here?
+        let _ = global.remote_event_task_source().queue(
+            task!(fail_the_event_source_connection: move || {
+                let event_source = event_source.root();
+                if event_source.ready_state.get() != ReadyState::Closed {
+                    event_source.ready_state.set(ReadyState::Closed);
+                    event_source.upcast::<EventTarget>().fire_event(atom!("error"));
+                }
+            }),
+            &global,
+        );
+    }
+
     pub fn request(&self) -> RequestInit {
         self.request.borrow().clone().unwrap()
     }
@@ -437,6 +451,7 @@ impl EventSource {
         };
         // Step 1, 5
         let ev = EventSource::new(global, url_record.clone(), event_source_init.withCredentials);
+        global.track_event_source(&ev);
         // Steps 6-7
         let cors_attribute_state = if event_source_init.withCredentials {
             CorsSettings::UseCredentials
@@ -491,13 +506,23 @@ impl EventSource {
         ROUTER.add_route(action_receiver.to_opaque(), Box::new(move |message| {
             listener.notify_fetch(message.to().unwrap());
         }));
+        let cancel_receiver = ev.canceller.borrow_mut().initialize();
         global.core_resource_thread().send(
-            CoreResourceMsg::Fetch(request, FetchChannels::ResponseMsg(action_sender, None))).unwrap();
+            CoreResourceMsg::Fetch(request, FetchChannels::ResponseMsg(action_sender, Some(cancel_receiver)))).unwrap();
         // Step 13
         Ok(ev)
     }
 }
 
+// https://html.spec.whatwg.org/multipage/#garbage-collection-2
+impl Drop for EventSource {
+    fn drop(&mut self) {
+        // If an EventSource object is garbage collected while its connection is still open,
+        // the user agent must abort any instance of the fetch algorithm opened by this EventSource.
+        self.canceller.borrow_mut().cancel();
+    }
+}
+
 impl EventSourceMethods for EventSource {
     // https://html.spec.whatwg.org/multipage/#handler-eventsource-onopen
     event_handler!(open, GetOnopen, SetOnopen);
@@ -527,6 +552,7 @@ impl EventSourceMethods for EventSource {
     fn Close(&self) {
         let GenerationId(prev_id) = self.generation_id.get();
         self.generation_id.set(GenerationId(prev_id + 1));
+        self.canceller.borrow_mut().cancel();
         self.ready_state.set(ReadyState::Closed);
     }
 }
diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index 08e7b2d3d62..325e05de882 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -4,6 +4,7 @@
 
 use devtools_traits::{ScriptToDevtoolsControlMsg, WorkerId};
 use dom::bindings::cell::DomRefCell;
+use dom::bindings::codegen::Bindings::EventSourceBinding::EventSourceBinding::EventSourceMethods;
 use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
 use dom::bindings::codegen::Bindings::WorkerGlobalScopeBinding::WorkerGlobalScopeMethods;
 use dom::bindings::conversions::root_from_object;
@@ -13,10 +14,12 @@ use dom::bindings::reflector::DomObject;
 use dom::bindings::root::{DomRoot, MutNullableDom};
 use dom::bindings::settings_stack::{AutoEntryScript, entry_global, incumbent_global};
 use dom::bindings::str::DOMString;
+use dom::bindings::weakref::DOMTracker;
 use dom::crypto::Crypto;
 use dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope;
 use dom::errorevent::ErrorEvent;
 use dom::event::{Event, EventBubbles, EventCancelable, EventStatus};
+use dom::eventsource::EventSource;
 use dom::eventtarget::EventTarget;
 use dom::performance::Performance;
 use dom::window::Window;
@@ -131,6 +134,9 @@ pub struct GlobalScope {
     /// Vector storing closing references of all workers
     #[ignore_malloc_size_of = "Arc"]
     list_auto_close_worker: DomRefCell<Vec<AutoCloseWorker>>,
+
+    /// Vector storing references of all eventsources.
+    event_source_tracker: DOMTracker<EventSource>,
 }
 
 impl GlobalScope {
@@ -164,6 +170,7 @@ impl GlobalScope {
             origin,
             microtask_queue,
             list_auto_close_worker: Default::default(),
+            event_source_tracker: DOMTracker::new(),
         }
     }
 
@@ -171,6 +178,24 @@ impl GlobalScope {
        self.list_auto_close_worker.borrow_mut().push(AutoCloseWorker(closing_worker));
     }
 
+    pub fn track_event_source(&self, event_source: &EventSource) {
+        self.event_source_tracker.track(event_source);
+    }
+
+    pub fn close_event_sources(&self) -> bool {
+        let mut canceled_any_fetch = false;
+        self.event_source_tracker.for_each(|event_source: DomRoot<EventSource>| {
+            match event_source.ReadyState() {
+                2 => {},
+                _ => {
+                    event_source.cancel();
+                    canceled_any_fetch = true;
+                }
+            }
+        });
+        canceled_any_fetch
+    }
+
     /// Returns the global scope of the realm that the given DOM object's reflector
     /// was created in.
     #[allow(unsafe_code)]
diff --git a/components/script/dom/htmlimageelement.rs b/components/script/dom/htmlimageelement.rs
index 7aead67ed79..727ba7e561d 100644
--- a/components/script/dom/htmlimageelement.rs
+++ b/components/script/dom/htmlimageelement.rs
@@ -300,7 +300,7 @@ impl HTMLImageElement {
 
         // This is a background load because the load blocker already fulfills the
         // purpose of delaying the document's load event.
-        document.loader().fetch_async_background(request, action_sender);
+        document.loader_mut().fetch_async_background(request, action_sender);
     }
 
     /// Step 14 of https://html.spec.whatwg.org/multipage/#update-the-image-data
diff --git a/components/script/dom/htmlmediaelement.rs b/components/script/dom/htmlmediaelement.rs
index 466bcae3280..83ad930337c 100644
--- a/components/script/dom/htmlmediaelement.rs
+++ b/components/script/dom/htmlmediaelement.rs
@@ -613,7 +613,7 @@ impl HTMLMediaElement {
                 ROUTER.add_route(action_receiver.to_opaque(), Box::new(move |message| {
                     listener.notify_fetch(message.to().unwrap());
                 }));
-                document.loader().fetch_async_background(request, action_sender);
+                document.loader_mut().fetch_async_background(request, action_sender);
             },
             Resource::Object => {
                 // FIXME(nox): Actually do something with the object.
diff --git a/components/script/dom/mediaquerylist.rs b/components/script/dom/mediaquerylist.rs
index 4c6be0091b1..63e743fde2e 100644
--- a/components/script/dom/mediaquerylist.rs
+++ b/components/script/dom/mediaquerylist.rs
@@ -2,24 +2,17 @@
  * 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::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
 use dom::bindings::codegen::Bindings::EventTargetBinding::AddEventListenerOptions;
 use dom::bindings::codegen::Bindings::EventTargetBinding::EventListenerOptions;
 use dom::bindings::codegen::Bindings::MediaQueryListBinding::{self, MediaQueryListMethods};
 use dom::bindings::inheritance::Castable;
-use dom::bindings::reflector::DomObject;
 use dom::bindings::reflector::reflect_dom_object;
 use dom::bindings::root::{Dom, DomRoot};
 use dom::bindings::str::DOMString;
-use dom::bindings::trace::JSTraceable;
-use dom::bindings::weakref::{WeakRef, WeakRefVec};
 use dom::document::Document;
-use dom::event::Event;
 use dom::eventtarget::EventTarget;
-use dom::mediaquerylistevent::MediaQueryListEvent;
 use dom_struct::dom_struct;
-use js::jsapi::JSTracer;
 use std::cell::Cell;
 use std::rc::Rc;
 use style::media_queries::MediaList;
@@ -56,7 +49,7 @@ impl MediaQueryList {
 }
 
 impl MediaQueryList {
-    fn evaluate_changes(&self) -> MediaQueryListMatchState {
+    pub fn evaluate_changes(&self) -> MediaQueryListMatchState {
         let matches = self.evaluate();
 
         let result = if let Some(old_matches) = self.last_match_state.get() {
@@ -115,48 +108,3 @@ impl MediaQueryListMethods for MediaQueryList {
     // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-onchange
     event_handler!(change, GetOnchange, SetOnchange);
 }
-
-#[derive(MallocSizeOf)]
-pub struct WeakMediaQueryListVec {
-    cell: DomRefCell<WeakRefVec<MediaQueryList>>,
-}
-
-impl WeakMediaQueryListVec {
-    /// Create a new vector of weak references to MediaQueryList
-    pub fn new() -> Self {
-        WeakMediaQueryListVec { cell: DomRefCell::new(WeakRefVec::new()) }
-    }
-
-    pub fn push(&self, mql: &MediaQueryList) {
-        self.cell.borrow_mut().push(WeakRef::new(mql));
-    }
-
-    /// Evaluate media query lists and report changes
-    /// <https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes>
-    pub fn evaluate_and_report_changes(&self) {
-        rooted_vec!(let mut mql_list);
-        self.cell.borrow_mut().update(|mql| {
-            let mql = mql.root().unwrap();
-            if let MediaQueryListMatchState::Changed(_) = mql.evaluate_changes() {
-                // Recording list of changed Media Queries
-                mql_list.push(Dom::from_ref(&*mql));
-            }
-        });
-        // Sending change events for all changed Media Queries
-        for mql in mql_list.iter() {
-            let event = MediaQueryListEvent::new(&mql.global(),
-                                                 atom!("change"),
-                                                 false, false,
-                                                 mql.Media(),
-                                                 mql.Matches());
-            event.upcast::<Event>().fire(mql.upcast::<EventTarget>());
-        }
-    }
-}
-
-#[allow(unsafe_code)]
-unsafe impl JSTraceable for WeakMediaQueryListVec {
-    unsafe fn trace(&self, _: *mut JSTracer) {
-        self.cell.borrow_mut().retain_alive()
-    }
-}
diff --git a/components/script/dom/servoparser/mod.rs b/components/script/dom/servoparser/mod.rs
index b5bbd2e98da..cc1da9b6c77 100644
--- a/components/script/dom/servoparser/mod.rs
+++ b/components/script/dom/servoparser/mod.rs
@@ -344,6 +344,11 @@ impl ServoParser {
         self.document.set_ready_state(DocumentReadyState::Interactive);
     }
 
+    // https://html.spec.whatwg.org/multipage/#active-parser
+    pub fn is_active(&self) -> bool {
+        self.script_nesting_level() > 0 && !self.aborted.get()
+    }
+
     #[allow(unrooted_must_root)]
     fn new_inherited(document: &Document,
                      tokenizer: Tokenizer,
@@ -477,6 +482,9 @@ impl ServoParser {
                 self.suspended.set(true);
                 return;
             }
+            if self.aborted.get() {
+                return;
+            }
         }
     }
 
diff --git a/components/script/dom/webidls/Window.webidl b/components/script/dom/webidls/Window.webidl
index 7fb00fbc05a..d7e22b1f60c 100644
--- a/components/script/dom/webidls/Window.webidl
+++ b/components/script/dom/webidls/Window.webidl
@@ -25,7 +25,7 @@
   attribute DOMString status;
   void close();
   readonly attribute boolean closed;
-  //void stop();
+  void stop();
   //void focus();
   //void blur();
 
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index a26570edb1c..4d6fca64cbd 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -12,6 +12,7 @@ use dom::bindings::cell::DomRefCell;
 use dom::bindings::codegen::Bindings::DocumentBinding::{DocumentMethods, DocumentReadyState};
 use dom::bindings::codegen::Bindings::FunctionBinding::Function;
 use dom::bindings::codegen::Bindings::HistoryBinding::HistoryBinding::HistoryMethods;
+use dom::bindings::codegen::Bindings::MediaQueryListBinding::MediaQueryListBinding::MediaQueryListMethods;
 use dom::bindings::codegen::Bindings::PermissionStatusBinding::PermissionState;
 use dom::bindings::codegen::Bindings::RequestBinding::RequestInit;
 use dom::bindings::codegen::Bindings::WindowBinding::{self, FrameRequestCallback, WindowMethods};
@@ -27,6 +28,7 @@ use dom::bindings::str::{DOMString, USVString};
 use dom::bindings::structuredclone::StructuredCloneData;
 use dom::bindings::trace::RootedTraceableBox;
 use dom::bindings::utils::{GlobalStaticData, WindowProxyHandler};
+use dom::bindings::weakref::DOMTracker;
 use dom::bluetooth::BluetoothExtraPermissionData;
 use dom::crypto::Crypto;
 use dom::cssstyledeclaration::{CSSModificationAccess, CSSStyleDeclaration, CSSStyleOwner};
@@ -39,7 +41,8 @@ use dom::globalscope::GlobalScope;
 use dom::hashchangeevent::HashChangeEvent;
 use dom::history::History;
 use dom::location::Location;
-use dom::mediaquerylist::{MediaQueryList, WeakMediaQueryListVec};
+use dom::mediaquerylist::{MediaQueryList, MediaQueryListMatchState};
+use dom::mediaquerylistevent::MediaQueryListEvent;
 use dom::messageevent::MessageEvent;
 use dom::navigator::Navigator;
 use dom::node::{Node, NodeDamage, document_from_node, from_untrusted_node_address};
@@ -263,7 +266,7 @@ pub struct Window {
     scroll_offsets: DomRefCell<HashMap<UntrustedNodeAddress, Vector2D<f32>>>,
 
     /// All the MediaQueryLists we need to update
-    media_query_lists: WeakMediaQueryListVec,
+    media_query_lists: DOMTracker<MediaQueryList>,
 
     test_runner: MutNullableDom<TestRunner>,
 
@@ -555,6 +558,13 @@ impl WindowMethods for Window {
         receiver.recv().unwrap();
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-window-stop
+    fn Stop(&self) {
+        // TODO: Cancel ongoing navigation.
+        let doc = self.Document();
+        doc.abort();
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-window-closed
     fn Closed(&self) -> bool {
         self.window_proxy.get()
@@ -1048,7 +1058,7 @@ impl WindowMethods for Window {
             media_queries::MediaList::parse(&context, &mut parser);
         let document = self.Document();
         let mql = MediaQueryList::new(&document, media_query_list);
-        self.media_query_lists.push(&*mql);
+        self.media_query_lists.track(&*mql);
         mql
     }
 
@@ -1113,6 +1123,16 @@ impl Window {
         }
     }
 
+    /// Cancels all the tasks from a given task source.
+    /// This sets the current sentinel value to
+    /// `true` and replaces it with a brand new one for future tasks.
+    pub fn cancel_all_tasks_from_source(&self, task_source_name: TaskSourceName) {
+        let mut ignore_flags = self.ignore_further_async_events.borrow_mut();
+        let flag = ignore_flags.entry(task_source_name).or_insert(Default::default());
+        let cancelled = mem::replace(&mut *flag, Default::default());
+        cancelled.store(true, Ordering::Relaxed);
+    }
+
     pub fn clear_js_runtime(&self) {
         // We tear down the active document, which causes all the attached
         // nodes to dispose of their layout data. This messages the layout
@@ -1777,8 +1797,25 @@ impl Window {
         self.parent_info.is_none()
     }
 
+    /// Evaluate media query lists and report changes
+    /// <https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes>
     pub fn evaluate_media_queries_and_report_changes(&self) {
-        self.media_query_lists.evaluate_and_report_changes();
+        rooted_vec!(let mut mql_list);
+        self.media_query_lists.for_each(|mql| {
+            if let MediaQueryListMatchState::Changed(_) = mql.evaluate_changes() {
+                // Recording list of changed Media Queries
+                mql_list.push(Dom::from_ref(&*mql));
+            }
+        });
+        // Sending change events for all changed Media Queries
+        for mql in mql_list.iter() {
+            let event = MediaQueryListEvent::new(&mql.global(),
+                                                 atom!("change"),
+                                                 false, false,
+                                                 mql.Media(),
+                                                 mql.Matches());
+            event.upcast::<Event>().fire(mql.upcast::<EventTarget>());
+        }
     }
 
     /// Slow down/speed up timers based on visibility.
@@ -1917,7 +1954,7 @@ impl Window {
             ignore_further_async_events: Default::default(),
             error_reporter,
             scroll_offsets: Default::default(),
-            media_query_lists: WeakMediaQueryListVec::new(),
+            media_query_lists: DOMTracker::new(),
             test_runner: Default::default(),
             webgl_chan,
             webvr_chan,
diff --git a/components/script/layout_image.rs b/components/script/layout_image.rs
index 553972d24b1..91bb021d060 100644
--- a/components/script/layout_image.rs
+++ b/components/script/layout_image.rs
@@ -78,5 +78,5 @@ pub fn fetch_image_for_layout(url: ServoUrl,
     };
 
     // Layout image loads do not delay the document load event.
-    document.loader().fetch_async_background(request, action_sender);
+    document.loader_mut().fetch_async_background(request, action_sender);
 }
diff --git a/tests/wpt/metadata/eventsource/eventsource-request-cancellation.htm.ini b/tests/wpt/metadata/eventsource/eventsource-request-cancellation.htm.ini
deleted file mode 100644
index 94f8dc31936..00000000000
--- a/tests/wpt/metadata/eventsource/eventsource-request-cancellation.htm.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[eventsource-request-cancellation.htm]
-  type: testharness
-  [EventSource: request cancellation]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/010.html.ini b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/010.html.ini
index 4dc31aa432a..cf12f241471 100644
--- a/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/010.html.ini
+++ b/tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/010.html.ini
@@ -1,3 +1,4 @@
 [010.html]
   type: testharness
-  expected: TIMEOUT
+  [Link with onclick form submit to javascript url with delayed document.write and href navigation ]
+    expected: FAIL
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/window-properties.https.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/window-properties.https.html.ini
index 27597793aa0..c691ea29632 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/window-properties.https.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/window-properties.https.html.ini
@@ -1,7 +1,4 @@
 [window-properties.https.html]
-  [Window method: stop]
-    expected: FAIL
-
   [Window method: focus]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini b/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini
deleted file mode 100644
index 39c3a3d651b..00000000000
--- a/tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[script-onerror-insertion-point-2.html]
-  type: testharness
-  expected: TIMEOUT
diff --git a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini
index 61cd7b4d408..97ff398498d 100644
--- a/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini
+++ b/tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini
@@ -1,8 +1,3 @@
 [aborted-parser.window.html]
-  expected: TIMEOUT
   [document.open() after parser is aborted]
-    expected: TIMEOUT
-
-  [async document.open() after parser is aborted]
-    expected: TIMEOUT
-
+    expected: FAIL
diff --git a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
index c9bacb01f1a..7f9b8e85550 100644
--- a/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
+++ b/tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini
@@ -4,7 +4,7 @@
 [webtiming-resolution.any.worker.html]
   expected: TIMEOUT
   [Verifies the resolution of performance.now() is at least 20 microseconds.]
-    expected: FAIL
+      expected: FAIL
 
   [Verifies the resolution of entry.startTime is at least 20 microseconds.]
     expected: TIMEOUT