--- a/servo/components/style/properties/gecko.mako.rs
+++ b/servo/components/style/properties/gecko.mako.rs
@@ -1537,16 +1537,32 @@ fn static_assert() {
         unsafe { current_settings.set_len_pod(settings_length) };
 
         for (current, feature) in current_settings.iter_mut().zip(feature_settings.iter()) {
             current.mTag = feature.mTag;
             current.mValue = feature.mValue;
         }
     }
 
+    pub fn clone_font_feature_settings(&self) -> longhands::font_feature_settings::computed_value::T {
+        use values::generics::{FontSettings, FontSettingTag, FontSettingTagInt} ;
+
+        match self.gecko.mFont.fontFeatureSettings.len() {
+            0 => FontSettings::Normal,
+            _ => FontSettings::Tag(
+                     self.gecko.mFont.fontFeatureSettings.iter().map(|gecko_font_feature_setting| {
+                         FontSettingTag {
+                             tag: gecko_font_feature_setting.mTag,
+                             value: FontSettingTagInt(gecko_font_feature_setting.mValue),
+                         }
+                     }).collect()
+                 )
+        }
+    }
+
     pub fn set_font_variation_settings(&mut self, v: longhands::font_variation_settings::computed_value::T) {
         use values::generics::FontSettings;
 
         let current_settings = &mut self.gecko.mFont.fontVariationSettings;
         current_settings.clear_pod();
 
         match v {
             FontSettings::Normal => (), // do nothing, length is already 0
@@ -1614,16 +1630,44 @@ fn static_assert() {
         unimplemented!()
     }
 
     pub fn copy_font_family_from(&mut self, other: &Self) {
         unsafe { Gecko_CopyFontFamilyFrom(&mut self.gecko.mFont, &other.gecko.mFont); }
         self.gecko.mGenericID = other.gecko.mGenericID;
     }
 
+    pub fn clone_font_family(&self) -> longhands::font_family::computed_value::T {
+        use properties::longhands::font_family::computed_value::{FontFamily, FamilyName};
+        use gecko_bindings::structs::FontFamilyType;
+        use gecko_string_cache::Atom;
+
+        ::properties::longhands::font_family::computed_value::T(
+            self.gecko.mFont.fontlist.mFontlist.iter().map(|gecko_font_family_name| {
+                match gecko_font_family_name.mType {
+                    FontFamilyType::eFamily_serif => FontFamily::Generic(atom!("serif")),
+                    FontFamilyType::eFamily_sans_serif => FontFamily::Generic(atom!("sans-serif")),
+                    FontFamilyType::eFamily_monospace => FontFamily::Generic(atom!("monospace")),
+                    FontFamilyType::eFamily_cursive => FontFamily::Generic(atom!("cursive")),
+                    FontFamilyType::eFamily_fantasy => FontFamily::Generic(atom!("fantasy")),
+                    FontFamilyType::eFamily_moz_fixed => FontFamily::Generic(Atom::from("-moz-fixed")),
+                    FontFamilyType::eFamily_named => FontFamily::FamilyName(FamilyName {
+                        name: (&*gecko_font_family_name.mName).into(),
+                        quoted: false
+                    }),
+                    FontFamilyType::eFamily_named_quoted => FontFamily::FamilyName(FamilyName {
+                        name: (&*gecko_font_family_name.mName).into(),
+                        quoted: true
+                    }),
+                    x => panic!("Found unexpected font FontFamilyType: {:?}", x),
+                }
+            }).collect()
+        )
+    }
+
     // FIXME(bholley): Gecko has two different sizes, one of which (mSize) is the
     // actual computed size, and the other of which (mFont.size) is the 'display
     // size' which takes font zooming into account. We don't handle font zooming yet.
     pub fn set_font_size(&mut self, v: longhands::font_size::computed_value::T) {
         self.gecko.mSize = v.0;
         self.gecko.mScriptUnconstrainedSize = v.0;
     }
 

--- a/servo/components/style/properties/longhand/font.mako.rs
+++ b/servo/components/style/properties/longhand/font.mako.rs
@@ -73,17 +73,17 @@ macro_rules! impl_gecko_keyword_from_tra
         }
 
         fn from_computed_value(other: &computed_value::T) -> Self {
             SpecifiedValue::Value(other.clone())
         }
     }
 </%def>
 
-<%helpers:longhand name="font-family" animation_value_type="none" need_index="True"  boxed="${product == 'gecko'}"
+<%helpers:longhand name="font-family" animation_value_type="discrete" need_index="True"  boxed="${product == 'gecko'}"
                    spec="https://drafts.csswg.org/css-fonts/#propdef-font-family">
     use properties::longhands::system_font::SystemFont;
     use self::computed_value::{FontFamily, FamilyName};
     use std::fmt;
     use style_traits::ToCss;
 
     no_viewport_percentage!(SpecifiedValue);
 
@@ -1867,17 +1867,17 @@ macro_rules! exclusive_value {
 ${helpers.single_keyword_system("font-variant-position",
                                 "normal sub super",
                                 products="gecko",
                                 gecko_ffi_name="mFont.variantPosition",
                                 gecko_constant_prefix="NS_FONT_VARIANT_POSITION",
                                 spec="https://drafts.csswg.org/css-fonts/#propdef-font-variant-position",
                                 animation_value_type="discrete")}
 
-<%helpers:longhand name="font-feature-settings" products="gecko" animation_value_type="none"
+<%helpers:longhand name="font-feature-settings" products="gecko" animation_value_type="discrete"
                    extra_prefixes="moz" boxed="True"
                    spec="https://drafts.csswg.org/css-fonts/#propdef-font-feature-settings">
     use properties::longhands::system_font::SystemFont;
     use std::fmt;
     use style_traits::ToCss;
     use values::generics::FontSettings;
 
     #[derive(Debug, Clone, PartialEq)]