diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index 54d72a5f4d8..7a2534ffb38 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -2429,6 +2429,7 @@ dependencies = [
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.8.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 0.8.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/components/style/values/mod.rs b/components/style/values/mod.rs
index e926685f11b..79be8f7bd50 100644
--- a/components/style/values/mod.rs
+++ b/components/style/values/mod.rs
@@ -7,11 +7,7 @@
 //! [values]: https://drafts.csswg.org/css-values/
 
 pub use cssparser::RGBA;
-
-use app_units::Au;
-use cssparser::CssStringWriter;
-use std::fmt::{self, Write};
-use url::Url;
+pub use style_traits::ToCss as LocalToCss;
 
 macro_rules! define_numbered_css_keyword_enum {
     ($name: ident: $( $css: expr => $variant: ident = $value: expr ),+,) => {
@@ -48,38 +44,6 @@ macro_rules! define_numbered_css_keyword_enum {
 pub mod computed;
 pub mod specified;
 
-/// The real ToCss trait can't be implemented for types in crates that don't
-/// depend on each other.
-pub trait LocalToCss {
-    /// Serialize `self` in CSS syntax, writing to `dest`.
-    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write;
-
-    /// Serialize `self` in CSS syntax and return a string.
-    ///
-    /// (This is a convenience wrapper for `to_css` and probably should not be overridden.)
-    #[inline]
-    fn to_css_string(&self) -> String {
-        let mut s = String::new();
-        self.to_css(&mut s).unwrap();
-        s
-    }
-}
-
-impl LocalToCss for Au {
-    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-        write!(dest, "{}px", self.to_f64_px())
-    }
-}
-
-impl LocalToCss for Url {
-    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-        try!(dest.write_str("url(\""));
-        try!(write!(CssStringWriter::new(dest), "{}", self));
-        try!(dest.write_str("\")"));
-        Ok(())
-    }
-}
-
 pub type CSSFloat = f32;
 
 pub const FONT_MEDIUM_PX: i32 = 16;
diff --git a/components/style_traits/Cargo.toml b/components/style_traits/Cargo.toml
index af4c9314381..07bc967e664 100644
--- a/components/style_traits/Cargo.toml
+++ b/components/style_traits/Cargo.toml
@@ -22,3 +22,4 @@ heapsize_derive = {version = "0.1", optional = true}
 rustc-serialize = "0.3"
 serde = {version = "0.8", optional = true}
 serde_derive = {version = "0.8", optional = true}
+url = "1.2"
diff --git a/components/style_traits/lib.rs b/components/style_traits/lib.rs
index bd060abf139..4ddb4e6a846 100644
--- a/components/style_traits/lib.rs
+++ b/components/style_traits/lib.rs
@@ -23,6 +23,7 @@ extern crate euclid;
 extern crate rustc_serialize;
 #[cfg(feature = "servo")] extern crate serde;
 #[cfg(feature = "servo")] #[macro_use] extern crate serde_derive;
+extern crate url;
 
 /// Opaque type stored in type-unsafe work queues for parallel layout.
 /// Must be transmutable to and from TNode.
@@ -61,3 +62,4 @@ pub mod cursor;
 pub mod values;
 pub mod viewport;
 
+pub use values::ToCss;
diff --git a/components/style_traits/values.rs b/components/style_traits/values.rs
index 747c1481bd1..5982b8695e8 100644
--- a/components/style_traits/values.rs
+++ b/components/style_traits/values.rs
@@ -2,6 +2,53 @@
  * 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 app_units::Au;
+use cssparser::CssStringWriter;
+use std::fmt::{self, Write};
+use url::Url;
+
+/// The real ToCss trait can't be implemented for types in crates that don't
+/// depend on each other.
+pub trait ToCss {
+    /// Serialize `self` in CSS syntax, writing to `dest`.
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write;
+
+    /// Serialize `self` in CSS syntax and return a string.
+    ///
+    /// (This is a convenience wrapper for `to_css` and probably should not be overridden.)
+    #[inline]
+    fn to_css_string(&self) -> String {
+        let mut s = String::new();
+        self.to_css(&mut s).unwrap();
+        s
+    }
+}
+
+impl ToCss for Au {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        write!(dest, "{}px", self.to_f64_px())
+    }
+}
+
+impl ToCss for Url {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        try!(dest.write_str("url(\""));
+        try!(write!(CssStringWriter::new(dest), "{}", self));
+        try!(dest.write_str("\")"));
+        Ok(())
+    }
+}
+
+macro_rules! impl_to_css_for_predefined_type {
+    ($name: ty) => {
+        impl<'a> ToCss for $name {
+            fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+                ::cssparser::ToCss::to_css(self, dest)
+            }
+        }
+    };
+}
+
 #[macro_export]
 macro_rules! define_css_keyword_enum {
     ($name: ident: $( $css: expr => $variant: ident ),+,) => {
@@ -61,7 +108,6 @@ macro_rules! __define_css_keyword_enum__actual {
     }
 }
 
-
 pub mod specified {
     use app_units::Au;
 
diff --git a/ports/geckolib/Cargo.lock b/ports/geckolib/Cargo.lock
index b2a72c41748..2970dba3b3f 100644
--- a/ports/geckolib/Cargo.lock
+++ b/ports/geckolib/Cargo.lock
@@ -373,6 +373,7 @@ dependencies = [
  "cssparser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]