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/document.rs b/components/script/dom/document.rs
index 26c59bdb8ec..1ff29786491 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;
@@ -2010,7 +2010,7 @@ 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 +2029,21 @@ impl Document {
         *self.asap_scripts_set.borrow_mut() = vec![];
         self.asap_in_order_scripts_list.clear();
         self.deferred_scripts.clear();
+        if self.loader.borrow_mut().cancel_all_loads() {
+            // 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);
         }
     }
 
diff --git a/components/script/dom/htmlimageelement.rs b/components/script/dom/htmlimageelement.rs
index 668c66d7734..de084a82de8 100644
--- a/components/script/dom/htmlimageelement.rs
+++ b/components/script/dom/htmlimageelement.rs
@@ -268,7 +268,7 @@ 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/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 ea3a92e0f37..5e1829f0c62 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -552,6 +552,13 @@ 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()
@@ -1110,6 +1117,16 @@ 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
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/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/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