Implement the CSS interface

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)
+    }
+}

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;

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);
+};

tests/wpt/mozilla/tests/mozilla/interfaces.html

@@ -58,6 +58,7 @@ var interfaceNamesInGlobalScope = [
   "CanvasRenderingContext2D",
   "CanvasPattern",
   "CharacterData",
+  "CSS",
   "CSSStyleDeclaration",
   "DOMRect",
   "Comment",