Support document.createElement("beforeunloadevent")

components/script/dom/document.rs

@@ -7,6 +7,7 @@ use devtools_traits::ScriptToDevtoolsControlMsg;
 use document_loader::{DocumentLoader, LoadType};
 use dom::activation::{ActivationSource, synthetic_click_activation};
 use dom::attr::Attr;
+use dom::beforeunloadevent::BeforeUnloadEvent;
 use dom::bindings::callback::ExceptionHandling;
 use dom::bindings::cell::DOMRefCell;
 use dom::bindings::codegen::Bindings::DOMRectBinding::DOMRectMethods;
@@ -2603,6 +2604,8 @@ impl DocumentMethods for Document {
     fn CreateEvent(&self, mut interface: DOMString) -> Fallible<Root<Event>> {
         interface.make_ascii_lowercase();
         match &*interface {
+            "beforeunloadevent" =>
+                Ok(Root::upcast(BeforeUnloadEvent::new_uninitialized(&self.window))),
             "closeevent" =>
                 Ok(Root::upcast(CloseEvent::new_uninitialized(self.window.upcast()))),
             "customevent" =>

tests/wpt/metadata/dom/events/EventTarget-dispatchEvent.html.ini

@@ -3,9 +3,6 @@
   [If the event's initialized flag is not set, an InvalidStateError must be thrown (AnimationEvent).]
     expected: FAIL
 
-  [If the event's initialized flag is not set, an InvalidStateError must be thrown (BeforeUnloadEvent).]
-    expected: FAIL
-
   [If the event's initialized flag is not set, an InvalidStateError must be thrown (CompositionEvent).]
     expected: FAIL
 

tests/wpt/metadata/dom/nodes/Document-createEvent.html.ini

@@ -19,24 +19,6 @@
   [createEvent('ANIMATIONEVENT') should be initialized correctly.]
     expected: FAIL
 
-  [BeforeUnloadEvent should be an alias for BeforeUnloadEvent.]
-    expected: FAIL
-
-  [createEvent('BeforeUnloadEvent') should be initialized correctly.]
-    expected: FAIL
-
-  [beforeunloadevent should be an alias for BeforeUnloadEvent.]
-    expected: FAIL
-
-  [createEvent('beforeunloadevent') should be initialized correctly.]
-    expected: FAIL
-
-  [BEFOREUNLOADEVENT should be an alias for BeforeUnloadEvent.]
-    expected: FAIL
-
-  [createEvent('BEFOREUNLOADEVENT') should be initialized correctly.]
-    expected: FAIL
-
   [CompositionEvent should be an alias for CompositionEvent.]
     expected: FAIL