diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index aab81fa2ca3..1ef3cc0b810 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -2616,7 +2616,11 @@ class CGAbstractStaticBindingMethod(CGAbstractMethod):
         CGAbstractMethod.__init__(self, descriptor, name, "JSBool", args, extern=True)
 
     def definition_body(self):
-        return self.generate_code()
+        preamble = CGGeneric("""\
+let global = global_object_for_js_object(JS_CALLEE(cx, vp).to_object());
+let global = global.root();
+""")
+        return CGList([preamble, self.generate_code()])
 
     def generate_code(self):
         assert False  # Override me
@@ -2674,7 +2678,7 @@ class CGStaticMethod(CGAbstractStaticBindingMethod):
     def generate_code(self):
         nativeName = CGSpecializedMethod.makeNativeName(self.descriptor,
                                                         self.method)
-        return CGMethodCall([], nativeName, True, self.descriptor, self.method)
+        return CGMethodCall(["global.r()"], nativeName, True, self.descriptor, self.method)
 
 
 class CGGenericGetter(CGAbstractBindingMethod):
@@ -2748,7 +2752,7 @@ class CGStaticGetter(CGAbstractStaticBindingMethod):
     def generate_code(self):
         nativeName = CGSpecializedGetter.makeNativeName(self.descriptor,
                                                         self.attr)
-        return CGGetterCall([], self.attr.type, nativeName, self.descriptor,
+        return CGGetterCall(["global.r()"], self.attr.type, nativeName, self.descriptor,
                             self.attr)
 
 
@@ -2827,7 +2831,7 @@ class CGStaticSetter(CGAbstractStaticBindingMethod):
             "    throw_type_error(cx, \"Not enough arguments to %s setter.\");\n"
             "    return 0;\n"
             "}" % self.attr.identifier.name)
-        call = CGSetterCall([], self.attr.type, nativeName, self.descriptor,
+        call = CGSetterCall(["global.r()"], self.attr.type, nativeName, self.descriptor,
                             self.attr)
         return CGList([checkForArg, call])
 
diff --git a/components/script/dom/css.rs b/components/script/dom/css.rs
new file mode 100644
index 00000000000..5f4bce94d28
--- /dev/null
+++ b/components/script/dom/css.rs
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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::error::{Error, Fallible};
+use dom::bindings::global::GlobalRef;
+use dom::bindings::utils::Reflector;
+use util::str::DOMString;
+
+use cssparser::serialize_identifier;
+
+#[dom_struct]
+pub struct CSS {
+    reflector_: Reflector,
+}
+
+impl CSS {
+    // http://dev.w3.org/csswg/cssom/#serialize-an-identifier
+    pub fn Escape(_: GlobalRef, ident: DOMString) -> Fallible<DOMString> {
+        if ident.bytes().any(|b| b == b'\0') {
+            return Err(Error::InvalidCharacter);
+        }
+        let mut escaped = DOMString::new();
+        serialize_identifier(&ident, &mut escaped).unwrap();
+        Ok(escaped)
+    }
+}
diff --git a/components/script/dom/mod.rs b/components/script/dom/mod.rs
index 9f33d5ec195..00b7a05d348 100644
--- a/components/script/dom/mod.rs
+++ b/components/script/dom/mod.rs
@@ -201,6 +201,7 @@ pub mod canvasgradient;
 pub mod canvaspattern;
 pub mod canvasrenderingcontext2d;
 pub mod characterdata;
+pub mod css;
 pub mod cssstyledeclaration;
 pub mod domrect;
 pub mod domrectlist;
diff --git a/components/script/dom/testbinding.rs b/components/script/dom/testbinding.rs
index a4bda4eb817..20451f64648 100644
--- a/components/script/dom/testbinding.rs
+++ b/components/script/dom/testbinding.rs
@@ -12,7 +12,7 @@ use dom::bindings::codegen::UnionTypes::EventOrString;
 use dom::bindings::codegen::UnionTypes::EventOrString::eString;
 use dom::bindings::codegen::UnionTypes::HTMLElementOrLong;
 use dom::bindings::codegen::UnionTypes::HTMLElementOrLong::eLong;
-use dom::bindings::global::GlobalField;
+use dom::bindings::global::{GlobalField, GlobalRef};
 use dom::bindings::js::{JSRef, Temporary};
 use dom::bindings::num::Finite;
 use dom::bindings::str::{ByteString, USVString};
@@ -361,8 +361,8 @@ impl<'a> TestBindingMethods for JSRef<'a, TestBinding> {
 }
 
 impl TestBinding {
-    pub fn BooleanAttributeStatic() -> bool { false }
-    pub fn SetBooleanAttributeStatic(_: bool) {}
-    pub fn ReceiveVoidStatic() {}
+    pub fn BooleanAttributeStatic(_: GlobalRef) -> bool { false }
+    pub fn SetBooleanAttributeStatic(_: GlobalRef, _: bool) {}
+    pub fn ReceiveVoidStatic(_: GlobalRef) {}
 }
 
diff --git a/components/script/dom/webidls/CSS.webidl b/components/script/dom/webidls/CSS.webidl
new file mode 100644
index 00000000000..59832c0af15
--- /dev/null
+++ b/components/script/dom/webidls/CSS.webidl
@@ -0,0 +1,12 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/#the-css-interface
+ */
+
+interface CSS {
+  [Throws]
+  static DOMString escape(DOMString ident);
+};
diff --git a/tests/wpt/mozilla/tests/mozilla/interfaces.html b/tests/wpt/mozilla/tests/mozilla/interfaces.html
index 9649a9f3e15..f31afc50ec9 100644
--- a/tests/wpt/mozilla/tests/mozilla/interfaces.html
+++ b/tests/wpt/mozilla/tests/mozilla/interfaces.html
@@ -58,6 +58,7 @@ var interfaceNamesInGlobalScope = [
   "CanvasRenderingContext2D",
   "CanvasPattern",
   "CharacterData",
+  "CSS",
   "CSSStyleDeclaration",
   "DOMRect",
   "Comment",