--- a/servo/components/style/properties/properties.mako.rs
+++ b/servo/components/style/properties/properties.mako.rs
@@ -2597,17 +2597,18 @@ pub mod style_structs {
     use super::longhands;
     use std::hash::{Hash, Hasher};
     use crate::logical_geometry::WritingMode;
     use crate::media_queries::Device;
     use crate::values::computed::NonNegativeLength;
 
     % for style_struct in data.active_style_structs():
         % if style_struct.name == "Font":
-        #[derive(Clone, Debug, MallocSizeOf, Serialize, Deserialize)]
+        #[derive(Clone, Debug, MallocSizeOf)]
+        #[cfg_attr(feature = "servo", derive(Serialize, Deserialize))]
         % else:
         #[derive(Clone, Debug, MallocSizeOf, PartialEq)]
         % endif
         /// The ${style_struct.name} style struct.
         pub struct ${style_struct.name} {
             % for longhand in style_struct.longhands:
                 % if not longhand.logical:
                     /// The ${longhand.name} computed value.

--- a/servo/components/style/values/computed/font.rs
+++ b/servo/components/style/values/computed/font.rs
@@ -88,19 +88,18 @@ impl From<FontWeight> for FontKitFontWei
     ComputeSquaredDistance,
     Copy,
     Debug,
     MallocSizeOf,
     PartialEq,
     ToAnimatedZero,
     ToCss,
     ToResolvedValue,
-    Serialize,
-    Deserialize,
 )]
+#[cfg_attr(feature = "servo", derive(Serialize, Deserialize))]
 /// The computed value of font-size
 pub struct FontSize {
     /// The size.
     pub size: NonNegativeLength,
     /// If derived from a keyword, the keyword and additional transformations applied to it
     #[css(skip)]
     pub keyword_info: KeywordInfo,
 }
@@ -477,25 +476,25 @@ impl From<&SingleFontFamily> for FontKit
         }
     }
 }
 
 #[cfg(feature = "servo")]
 #[derive(
     Clone,
     Debug,
+    Deserialize,
     Eq,
     Hash,
     MallocSizeOf,
     PartialEq,
+    Serialize,
     ToComputedValue,
     ToResolvedValue,
     ToShmem,
-    Serialize,
-    Deserialize,
 )]
 /// A list of SingleFontFamily
 pub struct FontFamilyList(Box<[SingleFontFamily]>);
 
 #[cfg(feature = "gecko")]
 #[derive(Clone, Debug, ToComputedValue, ToResolvedValue)]
 /// A list of SingleFontFamily
 pub enum FontFamilyList {

--- a/servo/components/style/values/specified/font.rs
+++ b/servo/components/style/values/specified/font.rs
@@ -542,19 +542,18 @@ impl Default for FontSizeKeyword {
     MallocSizeOf,
     PartialEq,
     ToAnimatedValue,
     ToAnimatedZero,
     ToComputedValue,
     ToCss,
     ToResolvedValue,
     ToShmem,
-    Serialize,
-    Deserialize,
 )]
+#[cfg_attr(feature = "servo", derive(Serialize, Deserialize))]
 /// Additional information for keyword-derived font sizes.
 pub struct KeywordInfo {
     /// The keyword used
     pub kw: FontSizeKeyword,
     /// A factor to be multiplied by the computed size of the keyword
     #[css(skip)]
     pub factor: f32,
     /// An additional fixed offset to add to the kw * factor in the case of