diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index 8fc5ca34dee..9651d815c9b 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -2498,7 +2498,7 @@ class CGWrapGlobalMethod(CGAbstractMethod):
     """
     Class that generates the FooBinding::Wrap function for global interfaces.
     """
-    def __init__(self, descriptor):
+    def __init__(self, descriptor, properties):
         assert not descriptor.interface.isCallback()
         assert descriptor.isGlobal()
         args = [Argument('*mut JSContext', 'cx'),
@@ -2506,9 +2506,22 @@ class CGWrapGlobalMethod(CGAbstractMethod):
         retval = 'Root<%s>' % descriptor.concreteType
         CGAbstractMethod.__init__(self, descriptor, 'Wrap', retval, args,
                                   pub=True, unsafe=True)
+        self.properties = properties
 
     def definition_body(self):
-        unforgeable = CopyUnforgeablePropertiesToInstance(self.descriptor)
+        values = {
+            "unforgeable": CopyUnforgeablePropertiesToInstance(self.descriptor)
+        }
+
+        pairs = [
+            ("define_guarded_properties", self.properties.attrs),
+            ("define_guarded_methods", self.properties.methods),
+            ("define_guarded_constants", self.properties.consts)
+        ]
+        members = ["%s(cx, obj.handle(), %s);" % (function, array.variableName())
+                   for (function, array) in pairs if array.length() > 0]
+        values["members"] = "\n".join(members)
+
         return CGGeneric("""\
 let raw = Box::into_raw(object);
 let _rt = RootedTraceable::new(&*raw);
@@ -2529,10 +2542,12 @@ rooted!(in(cx) let mut proto = ptr::null_mut());
 GetProtoObject(cx, obj.handle(), proto.handle_mut());
 JS_SplicePrototype(cx, obj.handle(), proto.handle());
 
-%(copyUnforgeable)s
+%(members)s
+
+%(unforgeable)s
 
 Root::from_ref(&*raw)\
-""" % {'copyUnforgeable': unforgeable})
+""" % values)
 
 
 class CGIDLInterface(CGThing):
@@ -2676,6 +2691,18 @@ assert!(!prototype_proto.is_null());""" % getPrototypeProto)]
             else:
                 properties[arrayName] = "&[]"
 
+        if self.descriptor.isGlobal():
+            assert not self.haveUnscopables
+            proto_properties = {
+                "attrs": "&[]",
+                "consts": "&[]",
+                "id": name,
+                "methods": "&[]",
+                "unscopables": "&[]",
+            }
+        else:
+            proto_properties = properties
+
         code.append(CGGeneric("""
 rooted!(in(cx) let mut prototype = ptr::null_mut());
 create_interface_prototype_object(cx,
@@ -2692,7 +2719,7 @@ assert!((*cache)[PrototypeList::ID::%(id)s as usize].is_null());
 <*mut JSObject>::post_barrier((*cache).as_mut_ptr().offset(PrototypeList::ID::%(id)s as isize),
                               ptr::null_mut(),
                               prototype.get());
-""" % properties))
+""" % proto_properties))
 
         if self.descriptor.interface.hasInterfaceObject():
             properties["name"] = str_to_const_array(name)
@@ -5299,8 +5326,8 @@ def generate_imports(config, cgthings, descriptors, callbacks=None, dictionaries
         'dom::bindings::interface::{NonCallbackInterfaceObjectClass, NonNullJSNative}',
         'dom::bindings::interface::{create_callback_interface_object, create_global_object}',
         'dom::bindings::interface::{create_interface_prototype_object, create_named_constructors}',
-        'dom::bindings::interface::{create_noncallback_interface_object, define_guarded_methods}',
-        'dom::bindings::interface::{define_guarded_properties, is_exposed_in}',
+        'dom::bindings::interface::{create_noncallback_interface_object, define_guarded_constants}',
+        'dom::bindings::interface::{define_guarded_methods, define_guarded_properties, is_exposed_in}',
         'dom::bindings::interface::ConstantVal::{IntVal, UintVal}',
         'dom::bindings::iterable::{IteratorType, Iterable}',
         'dom::bindings::js::{JS, Root, RootedReference}',
@@ -5450,6 +5477,8 @@ class CGDescriptor(CGThing):
         if descriptor.proxy:
             cgThings.append(CGDefineProxyHandler(descriptor))
 
+        properties = PropertyArrays(descriptor)
+
         if descriptor.concrete:
             if descriptor.proxy:
                 # cgThings.append(CGProxyIsProxy(descriptor))
@@ -5480,7 +5509,7 @@ class CGDescriptor(CGThing):
                 pass
 
             if descriptor.isGlobal():
-                cgThings.append(CGWrapGlobalMethod(descriptor))
+                cgThings.append(CGWrapGlobalMethod(descriptor, properties))
             else:
                 cgThings.append(CGWrapMethod(descriptor))
             reexports.append('Wrap')
@@ -5505,7 +5534,6 @@ class CGDescriptor(CGThing):
             if descriptor.weakReferenceable:
                 cgThings.append(CGWeakReferenceableTrait(descriptor))
 
-        properties = PropertyArrays(descriptor)
         cgThings.append(CGGeneric(str(properties)))
         cgThings.append(CGCreateInterfaceObjectsMethod(descriptor, properties, haveUnscopables))
 
diff --git a/components/script/dom/bindings/interface.rs b/components/script/dom/bindings/interface.rs
index d92510754d5..1e21c3db651 100644
--- a/components/script/dom/bindings/interface.rs
+++ b/components/script/dom/bindings/interface.rs
@@ -257,11 +257,7 @@ pub unsafe fn create_callback_interface_object(
     assert!(!constants.is_empty());
     rval.set(JS_NewObject(cx, ptr::null()));
     assert!(!rval.ptr.is_null());
-    for guard in constants {
-        if let Some(specs) = guard.expose(cx, rval.handle()) {
-            define_constants(cx, rval.handle(), specs);
-        }
-    }
+    define_guarded_constants(cx, rval.handle(), constants);
     define_name(cx, rval.handle(), name);
     define_on_global_object(cx, global, name, rval.handle());
 }
@@ -421,11 +417,7 @@ unsafe fn create_object(
     assert!(!rval.ptr.is_null());
     define_guarded_methods(cx, rval.handle(), methods);
     define_guarded_properties(cx, rval.handle(), properties);
-    for guard in constants {
-        if let Some(specs) = guard.expose(cx, rval.handle()) {
-            define_constants(cx, rval.handle(), specs);
-        }
-    }
+    define_guarded_constants(cx, rval.handle(), constants);
 }
 
 unsafe fn create_unscopable_object(
@@ -444,6 +436,18 @@ unsafe fn create_unscopable_object(
     }
 }
 
+/// Conditionally define constants on an object.
+pub unsafe fn define_guarded_constants(
+        cx: *mut JSContext,
+        obj: HandleObject,
+        constants: &[Guard<&[ConstantSpec]>]) {
+    for guard in constants {
+        if let Some(specs) = guard.expose(cx, obj) {
+            define_constants(cx, obj, specs);
+        }
+    }
+}
+
 /// Conditionally define methods on an object.
 pub unsafe fn define_guarded_methods(
         cx: *mut JSContext,
diff --git a/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini b/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini
index 828fc2e43c8..78d6184cd70 100644
--- a/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini
+++ b/tests/wpt/metadata-css/cssom-1_dev/html/interfaces.htm.ini
@@ -75,9 +75,6 @@
   [SVGElement interface: attribute style]
     expected: FAIL
 
-  [Window interface: operation getComputedStyle(Element,DOMString)]
-    expected: FAIL
-
   [MediaList interface: existence and properties of interface object]
     expected: FAIL
 
diff --git a/tests/wpt/metadata-css/cssom-view-1_dev/html/window-interface.htm.ini b/tests/wpt/metadata-css/cssom-view-1_dev/html/window-interface.htm.ini
index c0f0f4e73b4..fb15f5287a8 100644
--- a/tests/wpt/metadata-css/cssom-view-1_dev/html/window-interface.htm.ini
+++ b/tests/wpt/metadata-css/cssom-view-1_dev/html/window-interface.htm.ini
@@ -6,6 +6,3 @@
   [window_functions]
     expected: FAIL
 
-  [window_properties]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/browsers/the-window-object/window-properties.html.ini b/tests/wpt/metadata/html/browsers/the-window-object/window-properties.html.ini
index 70ebb9ddda8..d131f05bb2c 100644
--- a/tests/wpt/metadata/html/browsers/the-window-object/window-properties.html.ini
+++ b/tests/wpt/metadata/html/browsers/the-window-object/window-properties.html.ini
@@ -1,8 +1,5 @@
 [window-properties.html]
   type: testharness
-  [Window method: close]
-    expected: FAIL
-
   [Window method: stop]
     expected: FAIL
 
@@ -15,9 +12,6 @@
   [Window method: open]
     expected: FAIL
 
-  [Window method: alert]
-    expected: FAIL
-
   [Window method: confirm]
     expected: FAIL
 
@@ -27,276 +21,24 @@
   [Window method: print]
     expected: FAIL
 
-  [Window method: postMessage]
-    expected: FAIL
-
-  [Window method: btoa]
-    expected: FAIL
-
-  [Window method: atob]
-    expected: FAIL
-
-  [Window method: setTimeout]
-    expected: FAIL
-
-  [Window method: clearTimeout]
-    expected: FAIL
-
-  [Window method: setInterval]
-    expected: FAIL
-
-  [Window method: clearInterval]
-    expected: FAIL
-
   [Window method: getSelection]
     expected: FAIL
 
-  [Window method: getComputedStyle]
-    expected: FAIL
-
   [Window method: matchMedia]
     expected: FAIL
 
-  [Window method: scroll]
-    expected: FAIL
-
-  [Window method: scrollTo]
-    expected: FAIL
-
-  [Window method: scrollBy]
-    expected: FAIL
-
-  [Window readonly attribute: history]
-    expected: FAIL
-
-  [Window readonly attribute: frameElement]
-    expected: FAIL
-
-  [Window readonly attribute: navigator]
-    expected: FAIL
-
   [Window readonly attribute: applicationCache]
     expected: FAIL
 
-  [Window readonly attribute: sessionStorage]
-    expected: FAIL
-
-  [Window readonly attribute: localStorage]
-    expected: FAIL
-
   [Window attribute: name]
     expected: FAIL
 
-  [Window attribute: status]
-    expected: FAIL
-
   [Window attribute: opener]
     expected: FAIL
 
-  [Window attribute: onabort]
-    expected: FAIL
-
-  [Window attribute: onafterprint]
-    expected: FAIL
-
-  [Window attribute: onbeforeprint]
-    expected: FAIL
-
-  [Window attribute: onbeforeunload]
-    expected: FAIL
-
-  [Window attribute: onblur]
-    expected: FAIL
-
-  [Window attribute: oncancel]
-    expected: FAIL
-
-  [Window attribute: oncanplay]
-    expected: FAIL
-
-  [Window attribute: oncanplaythrough]
-    expected: FAIL
-
-  [Window attribute: onchange]
-    expected: FAIL
-
-  [Window attribute: onclick]
-    expected: FAIL
-
-  [Window attribute: onclose]
-    expected: FAIL
-
-  [Window attribute: oncontextmenu]
-    expected: FAIL
-
-  [Window attribute: oncuechange]
-    expected: FAIL
-
-  [Window attribute: ondblclick]
-    expected: FAIL
-
-  [Window attribute: ondrag]
-    expected: FAIL
-
-  [Window attribute: ondragend]
-    expected: FAIL
-
-  [Window attribute: ondragenter]
-    expected: FAIL
-
-  [Window attribute: ondragleave]
-    expected: FAIL
-
-  [Window attribute: ondragover]
-    expected: FAIL
-
-  [Window attribute: ondragstart]
-    expected: FAIL
-
-  [Window attribute: ondrop]
-    expected: FAIL
-
-  [Window attribute: ondurationchange]
-    expected: FAIL
-
-  [Window attribute: onemptied]
-    expected: FAIL
-
-  [Window attribute: onended]
-    expected: FAIL
-
-  [Window attribute: onerror]
-    expected: FAIL
-
-  [Window attribute: onfocus]
-    expected: FAIL
-
-  [Window attribute: onhashchange]
-    expected: FAIL
-
-  [Window attribute: oninput]
-    expected: FAIL
-
-  [Window attribute: oninvalid]
-    expected: FAIL
-
-  [Window attribute: onkeydown]
-    expected: FAIL
-
-  [Window attribute: onkeypress]
-    expected: FAIL
-
-  [Window attribute: onkeyup]
-    expected: FAIL
-
-  [Window attribute: onload]
-    expected: FAIL
-
-  [Window attribute: onloadeddata]
-    expected: FAIL
-
-  [Window attribute: onloadedmetadata]
-    expected: FAIL
-
-  [Window attribute: onloadstart]
-    expected: FAIL
-
-  [Window attribute: onmessage]
-    expected: FAIL
-
-  [Window attribute: onmousedown]
-    expected: FAIL
-
-  [Window attribute: onmousemove]
-    expected: FAIL
-
-  [Window attribute: onmouseout]
-    expected: FAIL
-
-  [Window attribute: onmouseover]
-    expected: FAIL
-
-  [Window attribute: onmouseup]
-    expected: FAIL
-
   [Window attribute: onmousewheel]
     expected: FAIL
 
-  [Window attribute: onoffline]
-    expected: FAIL
-
-  [Window attribute: ononline]
-    expected: FAIL
-
-  [Window attribute: onpause]
-    expected: FAIL
-
-  [Window attribute: onplay]
-    expected: FAIL
-
-  [Window attribute: onplaying]
-    expected: FAIL
-
-  [Window attribute: onpagehide]
-    expected: FAIL
-
-  [Window attribute: onpageshow]
-    expected: FAIL
-
-  [Window attribute: onpopstate]
-    expected: FAIL
-
-  [Window attribute: onprogress]
-    expected: FAIL
-
-  [Window attribute: onratechange]
-    expected: FAIL
-
-  [Window attribute: onreset]
-    expected: FAIL
-
-  [Window attribute: onresize]
-    expected: FAIL
-
-  [Window attribute: onscroll]
-    expected: FAIL
-
-  [Window attribute: onseeked]
-    expected: FAIL
-
-  [Window attribute: onseeking]
-    expected: FAIL
-
-  [Window attribute: onselect]
-    expected: FAIL
-
-  [Window attribute: onshow]
-    expected: FAIL
-
-  [Window attribute: onstalled]
-    expected: FAIL
-
-  [Window attribute: onstorage]
-    expected: FAIL
-
-  [Window attribute: onsubmit]
-    expected: FAIL
-
-  [Window attribute: onsuspend]
-    expected: FAIL
-
-  [Window attribute: ontimeupdate]
-    expected: FAIL
-
-  [Window attribute: onunload]
-    expected: FAIL
-
-  [Window attribute: onvolumechange]
-    expected: FAIL
-
-  [Window attribute: onwaiting]
-    expected: FAIL
-
   [Window unforgeable attribute: location]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/dom/interfaces.html.ini b/tests/wpt/metadata/html/dom/interfaces.html.ini
index 9934d8567d6..c444dcc4a8a 100644
--- a/tests/wpt/metadata/html/dom/interfaces.html.ini
+++ b/tests/wpt/metadata/html/dom/interfaces.html.ini
@@ -4917,9 +4917,6 @@
   [Window interface: attribute name]
     expected: FAIL
 
-  [Window interface: attribute history]
-    expected: FAIL
-
   [Window interface: attribute locationbar]
     expected: FAIL
 
@@ -4938,12 +4935,6 @@
   [Window interface: attribute toolbar]
     expected: FAIL
 
-  [Window interface: attribute status]
-    expected: FAIL
-
-  [Window interface: operation close()]
-    expected: FAIL
-
   [Window interface: attribute closed]
     expected: FAIL
 
@@ -4968,24 +4959,15 @@
   [Window interface: attribute parent]
     expected: FAIL
 
-  [Window interface: attribute frameElement]
-    expected: FAIL
-
   [Window interface: operation open(DOMString,DOMString,DOMString,boolean)]
     expected: FAIL
 
-  [Window interface: attribute navigator]
-    expected: FAIL
-
   [Window interface: attribute external]
     expected: FAIL
 
   [Window interface: attribute applicationCache]
     expected: FAIL
 
-  [Window interface: operation alert()]
-    expected: FAIL
-
   [Window interface: operation confirm(DOMString)]
     expected: FAIL
 
@@ -4998,288 +4980,27 @@
   [Window interface: operation showModalDialog(DOMString,any)]
     expected: FAIL
 
-  [Window interface: operation postMessage(any,DOMString,[object Object\])]
-    expected: FAIL
-
-  [Window interface: operation captureEvents()]
-    expected: FAIL
-
-  [Window interface: operation releaseEvents()]
-    expected: FAIL
-
-  [Window interface: attribute onabort]
-    expected: FAIL
-
   [Window interface: attribute onautocomplete]
     expected: FAIL
 
   [Window interface: attribute onautocompleteerror]
     expected: FAIL
 
-  [Window interface: attribute onblur]
-    expected: FAIL
-
-  [Window interface: attribute oncancel]
-    expected: FAIL
-
-  [Window interface: attribute oncanplay]
-    expected: FAIL
-
-  [Window interface: attribute oncanplaythrough]
-    expected: FAIL
-
-  [Window interface: attribute onchange]
-    expected: FAIL
-
-  [Window interface: attribute onclick]
-    expected: FAIL
-
-  [Window interface: attribute onclose]
-    expected: FAIL
-
-  [Window interface: attribute oncontextmenu]
-    expected: FAIL
-
-  [Window interface: attribute oncuechange]
-    expected: FAIL
-
-  [Window interface: attribute ondblclick]
-    expected: FAIL
-
-  [Window interface: attribute ondrag]
-    expected: FAIL
-
-  [Window interface: attribute ondragend]
-    expected: FAIL
-
-  [Window interface: attribute ondragenter]
-    expected: FAIL
-
-  [Window interface: attribute ondragexit]
-    expected: FAIL
-
-  [Window interface: attribute ondragleave]
-    expected: FAIL
-
-  [Window interface: attribute ondragover]
-    expected: FAIL
-
-  [Window interface: attribute ondragstart]
-    expected: FAIL
-
-  [Window interface: attribute ondrop]
-    expected: FAIL
-
-  [Window interface: attribute ondurationchange]
-    expected: FAIL
-
-  [Window interface: attribute onemptied]
-    expected: FAIL
-
-  [Window interface: attribute onended]
-    expected: FAIL
-
-  [Window interface: attribute onerror]
-    expected: FAIL
-
-  [Window interface: attribute onfocus]
-    expected: FAIL
-
-  [Window interface: attribute oninput]
-    expected: FAIL
-
-  [Window interface: attribute oninvalid]
-    expected: FAIL
-
-  [Window interface: attribute onkeydown]
-    expected: FAIL
-
-  [Window interface: attribute onkeypress]
-    expected: FAIL
-
-  [Window interface: attribute onkeyup]
-    expected: FAIL
-
-  [Window interface: attribute onload]
-    expected: FAIL
-
-  [Window interface: attribute onloadeddata]
-    expected: FAIL
-
-  [Window interface: attribute onloadedmetadata]
-    expected: FAIL
-
-  [Window interface: attribute onloadstart]
-    expected: FAIL
-
-  [Window interface: attribute onmousedown]
-    expected: FAIL
-
-  [Window interface: attribute onmouseenter]
-    expected: FAIL
-
-  [Window interface: attribute onmouseleave]
-    expected: FAIL
-
-  [Window interface: attribute onmousemove]
-    expected: FAIL
-
-  [Window interface: attribute onmouseout]
-    expected: FAIL
-
-  [Window interface: attribute onmouseover]
-    expected: FAIL
-
-  [Window interface: attribute onmouseup]
-    expected: FAIL
-
   [Window interface: attribute onmousewheel]
     expected: FAIL
 
-  [Window interface: attribute onpause]
-    expected: FAIL
-
-  [Window interface: attribute onplay]
-    expected: FAIL
-
-  [Window interface: attribute onplaying]
-    expected: FAIL
-
-  [Window interface: attribute onprogress]
-    expected: FAIL
-
-  [Window interface: attribute onratechange]
-    expected: FAIL
-
-  [Window interface: attribute onreset]
-    expected: FAIL
-
-  [Window interface: attribute onresize]
-    expected: FAIL
-
-  [Window interface: attribute onscroll]
-    expected: FAIL
-
-  [Window interface: attribute onseeked]
-    expected: FAIL
-
-  [Window interface: attribute onseeking]
-    expected: FAIL
-
-  [Window interface: attribute onselect]
-    expected: FAIL
-
-  [Window interface: attribute onshow]
-    expected: FAIL
-
   [Window interface: attribute onsort]
     expected: FAIL
 
-  [Window interface: attribute onstalled]
-    expected: FAIL
-
-  [Window interface: attribute onsubmit]
-    expected: FAIL
-
-  [Window interface: attribute onsuspend]
-    expected: FAIL
-
-  [Window interface: attribute ontimeupdate]
-    expected: FAIL
-
-  [Window interface: attribute ontoggle]
-    expected: FAIL
-
-  [Window interface: attribute onvolumechange]
-    expected: FAIL
-
-  [Window interface: attribute onwaiting]
-    expected: FAIL
-
-  [Window interface: attribute onafterprint]
-    expected: FAIL
-
-  [Window interface: attribute onbeforeprint]
-    expected: FAIL
-
-  [Window interface: attribute onbeforeunload]
-    expected: FAIL
-
-  [Window interface: attribute onhashchange]
-    expected: FAIL
-
-  [Window interface: attribute onlanguagechange]
-    expected: FAIL
-
-  [Window interface: attribute onmessage]
-    expected: FAIL
-
-  [Window interface: attribute onoffline]
-    expected: FAIL
-
-  [Window interface: attribute ononline]
-    expected: FAIL
-
-  [Window interface: attribute onpagehide]
-    expected: FAIL
-
-  [Window interface: attribute onpageshow]
-    expected: FAIL
-
-  [Window interface: attribute onpopstate]
-    expected: FAIL
-
-  [Window interface: attribute onstorage]
-    expected: FAIL
-
-  [Window interface: attribute onunload]
-    expected: FAIL
-
-  [Window interface: operation btoa(DOMString)]
-    expected: FAIL
-
-  [Window interface: operation atob(DOMString)]
-    expected: FAIL
-
-  [Window interface: operation setTimeout(Function,long,any)]
-    expected: FAIL
-
-  [Window interface: operation setTimeout(DOMString,long,any)]
-    expected: FAIL
-
-  [Window interface: operation clearTimeout(long)]
-    expected: FAIL
-
-  [Window interface: operation setInterval(Function,long,any)]
-    expected: FAIL
-
-  [Window interface: operation setInterval(DOMString,long,any)]
-    expected: FAIL
-
-  [Window interface: operation clearInterval(long)]
-    expected: FAIL
-
   [Window interface: operation createImageBitmap(ImageBitmapSource,long,long,long,long)]
     expected: FAIL
 
-  [Window interface: attribute sessionStorage]
-    expected: FAIL
-
-  [Window interface: attribute localStorage]
-    expected: FAIL
-
-  [Window interface: window must inherit property "self" with the proper type (1)]
-    expected: FAIL
-
   [Window interface: window must inherit property "name" with the proper type (3)]
     expected: FAIL
 
   [Window interface: window must have own property "location"]
     expected: FAIL
 
-  [Window interface: window must inherit property "history" with the proper type (5)]
-    expected: FAIL
-
   [Window interface: window must inherit property "locationbar" with the proper type (6)]
     expected: FAIL
 
@@ -5298,9 +5019,6 @@
   [Window interface: window must inherit property "toolbar" with the proper type (11)]
     expected: FAIL
 
-  [Window interface: window must inherit property "status" with the proper type (12)]
-    expected: FAIL
-
   [Window interface: window must inherit property "closed" with the proper type (14)]
     expected: FAIL
 
@@ -5313,18 +5031,12 @@
   [Window interface: window must inherit property "blur" with the proper type (17)]
     expected: FAIL
 
-  [Window interface: window must inherit property "frames" with the proper type (18)]
-    expected: FAIL
-
   [Window interface: window must inherit property "length" with the proper type (19)]
     expected: FAIL
 
   [Window interface: window must inherit property "opener" with the proper type (21)]
     expected: FAIL
 
-  [Window interface: window must inherit property "parent" with the proper type (22)]
-    expected: FAIL
-
   [Window interface: window must inherit property "open" with the proper type (24)]
     expected: FAIL
 
@@ -5358,225 +5070,18 @@
   [Window interface: calling showModalDialog(DOMString,any) on window with too few arguments must throw TypeError]
     expected: FAIL
 
-  [Window interface: window must inherit property "postMessage" with the proper type (35)]
-    expected: FAIL
-
-  [Window interface: calling postMessage(any,DOMString,[object Object\]) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "captureEvents" with the proper type (36)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "releaseEvents" with the proper type (37)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onabort" with the proper type (38)]
-    expected: FAIL
-
   [Window interface: window must inherit property "onautocomplete" with the proper type (39)]
     expected: FAIL
 
   [Window interface: window must inherit property "onautocompleteerror" with the proper type (40)]
     expected: FAIL
 
-  [Window interface: window must inherit property "onblur" with the proper type (41)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "oncancel" with the proper type (42)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "oncanplay" with the proper type (43)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "oncanplaythrough" with the proper type (44)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onclose" with the proper type (47)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "oncontextmenu" with the proper type (48)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "oncuechange" with the proper type (49)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondblclick" with the proper type (50)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondrag" with the proper type (51)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondragend" with the proper type (52)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondragenter" with the proper type (53)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondragexit" with the proper type (54)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondragleave" with the proper type (55)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondragover" with the proper type (56)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondragstart" with the proper type (57)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondrop" with the proper type (58)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ondurationchange" with the proper type (59)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onemptied" with the proper type (60)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onended" with the proper type (61)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onfocus" with the proper type (63)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "oninvalid" with the proper type (65)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onkeydown" with the proper type (66)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onkeypress" with the proper type (67)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onkeyup" with the proper type (68)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onloadeddata" with the proper type (70)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onloadedmetadata" with the proper type (71)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onloadstart" with the proper type (72)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmousedown" with the proper type (73)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmouseenter" with the proper type (74)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmouseleave" with the proper type (75)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmousemove" with the proper type (76)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmouseout" with the proper type (77)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmouseover" with the proper type (78)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmouseup" with the proper type (79)]
-    expected: FAIL
-
   [Window interface: window must inherit property "onmousewheel" with the proper type (80)]
     expected: FAIL
 
-  [Window interface: window must inherit property "onpause" with the proper type (81)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onplay" with the proper type (82)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onplaying" with the proper type (83)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onprogress" with the proper type (84)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onratechange" with the proper type (85)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onreset" with the proper type (86)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onresize" with the proper type (87)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onscroll" with the proper type (88)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onseeked" with the proper type (89)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onseeking" with the proper type (90)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onselect" with the proper type (91)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onshow" with the proper type (92)]
-    expected: FAIL
-
   [Window interface: window must inherit property "onsort" with the proper type (93)]
     expected: FAIL
 
-  [Window interface: window must inherit property "onstalled" with the proper type (94)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onsuspend" with the proper type (96)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ontimeupdate" with the proper type (97)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ontoggle" with the proper type (98)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onvolumechange" with the proper type (99)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onwaiting" with the proper type (100)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onafterprint" with the proper type (101)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onbeforeprint" with the proper type (102)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onbeforeunload" with the proper type (103)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onhashchange" with the proper type (104)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onlanguagechange" with the proper type (105)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onmessage" with the proper type (106)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onoffline" with the proper type (107)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "ononline" with the proper type (108)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onpagehide" with the proper type (109)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onpageshow" with the proper type (110)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onpopstate" with the proper type (111)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onstorage" with the proper type (112)]
-    expected: FAIL
-
   [Window interface: window must inherit property "createImageBitmap" with the proper type (122)]
     expected: FAIL
 
@@ -6354,93 +5859,6 @@
   [HTMLDirectoryElement interface: document.createElement("dir") must inherit property "compact" with the proper type (0)]
     expected: FAIL
 
-  [Window interface: window must inherit property "close" with the proper type (13)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "frameElement" with the proper type (23)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "navigator" with the proper type (27)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "alert" with the proper type (30)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onchange" with the proper type (45)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onclick" with the proper type (46)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onerror" with the proper type (62)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "oninput" with the proper type (64)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onload" with the proper type (69)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onsubmit" with the proper type (95)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "onunload" with the proper type (113)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "btoa" with the proper type (114)]
-    expected: FAIL
-
-  [Window interface: calling btoa(DOMString) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "atob" with the proper type (115)]
-    expected: FAIL
-
-  [Window interface: calling atob(DOMString) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "setTimeout" with the proper type (116)]
-    expected: FAIL
-
-  [Window interface: calling setTimeout(Function,long,any) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "setTimeout" with the proper type (117)]
-    expected: FAIL
-
-  [Window interface: calling setTimeout(DOMString,long,any) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "clearTimeout" with the proper type (118)]
-    expected: FAIL
-
-  [Window interface: calling clearTimeout(long) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "setInterval" with the proper type (119)]
-    expected: FAIL
-
-  [Window interface: calling setInterval(Function,long,any) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "setInterval" with the proper type (120)]
-    expected: FAIL
-
-  [Window interface: calling setInterval(DOMString,long,any) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "clearInterval" with the proper type (121)]
-    expected: FAIL
-
-  [Window interface: calling clearInterval(long) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "sessionStorage" with the proper type (123)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "localStorage" with the proper type (124)]
-    expected: FAIL
-
   [Location interface: window.location must have own property "replace"]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/webappapis/animation-frames/idlharness.html.ini b/tests/wpt/metadata/html/webappapis/animation-frames/idlharness.html.ini
deleted file mode 100644
index 38d8e70fb8c..00000000000
--- a/tests/wpt/metadata/html/webappapis/animation-frames/idlharness.html.ini
+++ /dev/null
@@ -1,20 +0,0 @@
-[idlharness.html]
-  type: testharness
-  [Window interface: operation requestAnimationFrame(FrameRequestCallback)]
-    expected: FAIL
-
-  [Window interface: operation cancelAnimationFrame(long)]
-    expected: FAIL
-
-  [Window interface: window must inherit property "requestAnimationFrame" with the proper type (0)]
-    expected: FAIL
-
-  [Window interface: calling requestAnimationFrame(FrameRequestCallback) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [Window interface: window must inherit property "cancelAnimationFrame" with the proper type (1)]
-    expected: FAIL
-
-  [Window interface: calling cancelAnimationFrame(long) on window with too few arguments must throw TypeError]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/navigation-timing/idlharness.html.ini b/tests/wpt/metadata/navigation-timing/idlharness.html.ini
index c5b0f355386..8f3141197b8 100644
--- a/tests/wpt/metadata/navigation-timing/idlharness.html.ini
+++ b/tests/wpt/metadata/navigation-timing/idlharness.html.ini
@@ -3,9 +3,6 @@
   [Window interface: attribute performance]
     expected: FAIL
 
-  [Window interface: window must inherit property "performance" with the proper type (0)]
-    expected: FAIL
-
   [PerformanceTiming interface: attribute unloadEventStart]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/navigation-timing/test_readwrite.html.ini b/tests/wpt/metadata/navigation-timing/test_readwrite.html.ini
new file mode 100644
index 00000000000..415ad0478a3
--- /dev/null
+++ b/tests/wpt/metadata/navigation-timing/test_readwrite.html.ini
@@ -0,0 +1,9 @@
+[test_readwrite.html]
+  type: testharness
+  bug: https://github.com/servo/servo/issues/13033
+  [window.performance is read/write]
+    expected: FAIL
+
+  [var performance is read/write]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/webstorage/idlharness.html.ini b/tests/wpt/metadata/webstorage/idlharness.html.ini
deleted file mode 100644
index 6885750802e..00000000000
--- a/tests/wpt/metadata/webstorage/idlharness.html.ini
+++ /dev/null
@@ -1,8 +0,0 @@
-[idlharness.html]
-  type: testharness
-  [Window interface: attribute localStorage]
-    expected: FAIL
-
-  [Window interface: attribute sessionStorage]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/workers/interfaces.worker.js.ini b/tests/wpt/metadata/workers/interfaces.worker.js.ini
index 3928e5f88e0..eddc260926b 100644
--- a/tests/wpt/metadata/workers/interfaces.worker.js.ini
+++ b/tests/wpt/metadata/workers/interfaces.worker.js.ini
@@ -45,15 +45,6 @@
   [WorkerLocation interface: self.location must inherit property "origin" with the proper type (1)]
     expected: FAIL
 
-  [DedicatedWorkerGlobalScope interface: self must inherit property "postMessage" with the proper type (0)]
-    expected: FAIL
-
-  [DedicatedWorkerGlobalScope interface: calling postMessage(any,[object Object\]) on self with too few arguments must throw TypeError]
-    expected: FAIL
-
-  [DedicatedWorkerGlobalScope interface: self must inherit property "onmessage" with the proper type (1)]
-    expected: FAIL
-
   [WorkerNavigator interface: self.navigator must inherit property "languages" with the proper type (7)]
     expected: FAIL
 
@@ -75,3 +66,6 @@
   [WorkerLocation interface: existence and properties of interface object]
     expected: FAIL
 
+  [WorkerGlobalScope interface: self must inherit property "close" with the proper type (2)]
+    expected: FAIL
+