--- a/servo/components/style/gecko/url.rs
+++ b/servo/components/style/gecko/url.rs
@@ -2,16 +2,17 @@
  * 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/. */
 
 //! Common handling for the specified value CSS url() values.
 
 use gecko_bindings::structs::{ServoBundledURI, URLExtraData};
 use gecko_bindings::structs::mozilla::css::URLValueData;
 use gecko_bindings::structs::root::mozilla::css::ImageValue;
+use gecko_bindings::structs::root::nsStyleImageRequest;
 use gecko_bindings::sugar::refptr::RefPtr;
 use parser::ParserContext;
 use std::fmt;
 use style_traits::{ToCss, ParseError};
 use stylearc::Arc;
 
 /// A specified url() value for gecko. Gecko does not eagerly resolve SpecifiedUrls.
 #[derive(Clone, Debug, PartialEq)]
@@ -57,16 +58,29 @@ impl SpecifiedUrl {
                                        -> Result<SpecifiedUrl, ()> {
         Ok(SpecifiedUrl {
             serialization: Arc::new(url.mString.to_string()),
             extra_data: url.mExtraData.to_safe(),
             image_value: None,
         })
     }
 
+    /// Convert from nsStyleImageRequest to SpecifiedUrl.
+    pub unsafe fn from_image_request(image_request: &nsStyleImageRequest) -> Result<SpecifiedUrl, ()> {
+        if image_request.mImageValue.mRawPtr.is_null() {
+            return Err(());
+        }
+
+        let image_value = image_request.mImageValue.mRawPtr.as_ref().unwrap();
+        let ref url_value_data = image_value._base;
+        let mut result = try!(Self::from_url_value_data(url_value_data));
+        result.build_image_value();
+        Ok(result)
+    }
+
     /// Returns true if this URL looks like a fragment.
     /// See https://drafts.csswg.org/css-values/#local-urls
     pub fn is_fragment(&self) -> bool {
         self.as_str().chars().next().map_or(false, |c| c == '#')
     }
 
     /// Return the resolved url as string, or the empty string if it's invalid.
     ///

--- a/servo/components/style/properties/gecko.mako.rs
+++ b/servo/components/style/properties/gecko.mako.rs
@@ -3406,16 +3406,34 @@ fn static_assert() {
             }
         }
     }
 
     pub fn copy_list_style_image_from(&mut self, other: &Self) {
         unsafe { Gecko_CopyListStyleImageFrom(&mut self.gecko, &other.gecko); }
     }
 
+    pub fn clone_list_style_image(&self) -> longhands::list_style_image::computed_value::T {
+        use values::specified::url::SpecifiedUrl;
+        use values::{Either, None_};
+
+        longhands::list_style_image::computed_value::T(
+            match self.gecko.mListStyleImage.mRawPtr.is_null() {
+                true => Either::Second(None_),
+                false => {
+                    unsafe {
+                        let ref gecko_image_request = *self.gecko.mListStyleImage.mRawPtr;
+                        Either::First(SpecifiedUrl::from_image_request(gecko_image_request)
+                                      .expect("mListStyleImage could not convert to SpecifiedUrl"))
+                    }
+                }
+            }
+        )
+    }
+
     pub fn set_list_style_type(&mut self, v: longhands::list_style_type::computed_value::T, device: &Device) {
         use gecko_bindings::bindings::Gecko_SetCounterStyleToString;
         use nsstring::{nsACString, nsCString};
         use self::longhands::list_style_type::computed_value::T;
         match v {
             T::CounterStyle(s) => s.to_gecko_value(&mut self.gecko.mCounterStyle, device),
             T::String(s) => unsafe {
                 Gecko_SetCounterStyleToString(&mut self.gecko.mCounterStyle,

--- a/servo/components/style/properties/longhand/list.mako.rs
+++ b/servo/components/style/properties/longhand/list.mako.rs
@@ -95,17 +95,17 @@
                 SpecifiedValue::CounterStyle(style)
             } else {
                 SpecifiedValue::String(input.expect_string()?.into_owned())
             })
         }
     </%helpers:longhand>
 % endif
 
-<%helpers:longhand name="list-style-image" animation_value_type="none"
+<%helpers:longhand name="list-style-image" animation_value_type="discrete"
                    boxed="${product == 'gecko'}"
                    spec="https://drafts.csswg.org/css-lists/#propdef-list-style-image">
     use values::computed::ComputedValueAsSpecified;
     use values::specified::UrlOrNone;
     pub use self::computed_value::T as SpecifiedValue;
 
     pub mod computed_value {
         use values::specified::UrlOrNone;