diff --git a/components/script/dom/event.rs b/components/script/dom/event.rs
index 914cf279278..1be80dc7d36 100644
--- a/components/script/dom/event.rs
+++ b/components/script/dom/event.rs
@@ -309,6 +309,18 @@ impl EventMethods for Event {
         }
     }
 
+    // https://dom.spec.whatwg.org/#dom-event-cancelbubble
+    fn CancelBubble(&self) -> bool {
+        self.stop_propagation.get()
+    }
+
+    // https://dom.spec.whatwg.org/#dom-event-cancelbubble
+    fn SetCancelBubble(&self, value: bool) {
+        if value {
+            self.stop_propagation.set(true)
+        }
+    }
+
     // https://dom.spec.whatwg.org/#dom-event-timestamp
     fn TimeStamp(&self) -> u64 {
         self.timestamp
diff --git a/components/script/dom/webidls/Event.webidl b/components/script/dom/webidls/Event.webidl
index 1a6fd8e4a5c..f6074bd68f3 100644
--- a/components/script/dom/webidls/Event.webidl
+++ b/components/script/dom/webidls/Event.webidl
@@ -20,6 +20,7 @@ interface Event {
   readonly attribute unsigned short eventPhase;
 
   void stopPropagation();
+  attribute boolean cancelBubble;
   void stopImmediatePropagation();
 
   [Pure]
diff --git a/tests/wpt/metadata/dom/events/Event-cancelBubble.html.ini b/tests/wpt/metadata/dom/events/Event-cancelBubble.html.ini
deleted file mode 100644
index 266447e4c08..00000000000
--- a/tests/wpt/metadata/dom/events/Event-cancelBubble.html.ini
+++ /dev/null
@@ -1,26 +0,0 @@
-[Event-cancelBubble.html]
-  type: testharness
-  [cancelBubble must be false when an event is initially created.]
-    expected: FAIL
-
-  [Initializing an event must set cancelBubble to false.]
-    expected: FAIL
-
-  [stopPropagation() must set cancelBubble to true.]
-    expected: FAIL
-
-  [stopImmediatePropagation() must set cancelBubble to true.]
-    expected: FAIL
-
-  [Event.cancelBubble=false must have no effect.]
-    expected: FAIL
-
-  [Event.cancelBubble=false must have no effect during event propagation.]
-    expected: FAIL
-
-  [cancelBubble must be false after an event has been dispatched.]
-    expected: FAIL
-
-  [Event.cancelBubble=true must set the stop propagation flag.]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/dom/events/Event-dispatch-bubble-canceled.html.ini b/tests/wpt/metadata/dom/events/Event-dispatch-bubble-canceled.html.ini
deleted file mode 100644
index f98def06bcf..00000000000
--- a/tests/wpt/metadata/dom/events/Event-dispatch-bubble-canceled.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[Event-dispatch-bubble-canceled.html]
-  type: testharness
-  [Setting cancelBubble=true prior to dispatchEvent()]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/dom/events/Event-dispatch-multiple-cancelBubble.html.ini b/tests/wpt/metadata/dom/events/Event-dispatch-multiple-cancelBubble.html.ini
deleted file mode 100644
index 3b40ae33df9..00000000000
--- a/tests/wpt/metadata/dom/events/Event-dispatch-multiple-cancelBubble.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[Event-dispatch-multiple-cancelBubble.html]
-  type: testharness
-  [Multiple dispatchEvent() and cancelBubble]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/dom/events/Event-initEvent.html.ini b/tests/wpt/metadata/dom/events/Event-initEvent.html.ini
index f7a1e9dc18c..5426bf5b727 100644
--- a/tests/wpt/metadata/dom/events/Event-initEvent.html.ini
+++ b/tests/wpt/metadata/dom/events/Event-initEvent.html.ini
@@ -1,7 +1,5 @@
 [Event-initEvent.html]
   type: testharness
-  [Calling initEvent must unset the stop propagation flag.]
-    expected: FAIL
 
   [Properties of initEvent(type, true, true)]
     expected: FAIL
diff --git a/tests/wpt/metadata/dom/events/Event-propagation.html.ini b/tests/wpt/metadata/dom/events/Event-propagation.html.ini
deleted file mode 100644
index a1baee903f0..00000000000
--- a/tests/wpt/metadata/dom/events/Event-propagation.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[Event-propagation.html]
-  type: testharness
-  [After cancelBubble=true]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/dom/interfaces.html.ini b/tests/wpt/metadata/dom/interfaces.html.ini
index 3803e1734d6..c5fd2b318af 100644
--- a/tests/wpt/metadata/dom/interfaces.html.ini
+++ b/tests/wpt/metadata/dom/interfaces.html.ini
@@ -1262,18 +1262,6 @@
   [Window interface: attribute event]
     expected: FAIL
 
-  [Event interface: attribute cancelBubble]
-    expected: FAIL
-
-  [Event interface: document.createEvent("Event") must inherit property "cancelBubble" with the proper type]
-    expected: FAIL
-
-  [Event interface: new Event("foo") must inherit property "cancelBubble" with the proper type]
-    expected: FAIL
-
-  [Event interface: new CustomEvent("foo") must inherit property "cancelBubble" with the proper type]
-    expected: FAIL
-
   [Document interface: operation prepend([object Object\],[object Object\])]
     expected: FAIL