diff --git a/components/style/values/computed/percentage.rs b/components/style/values/computed/percentage.rs
index 7ca504d2aff..653532aea6c 100644
--- a/components/style/values/computed/percentage.rs
+++ b/components/style/values/computed/percentage.rs
@@ -12,8 +12,9 @@ use values::generics::NonNegative;
 
 /// A computed percentage.
 #[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
-#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug, Default, MallocSizeOf, PartialEq,
-         PartialOrd, ToAnimatedZero, ToComputedValue)]
+#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug, Default,
+         MallocSizeOf, PartialEq, PartialOrd, SpecifiedValueInfo,
+         ToAnimatedZero, ToComputedValue)]
 pub struct Percentage(pub CSSFloat);
 
 impl Percentage {
diff --git a/components/style/values/generics/font.rs b/components/style/values/generics/font.rs
index d4e55af6a61..f5e62e0ab5f 100644
--- a/components/style/values/generics/font.rs
+++ b/components/style/values/generics/font.rs
@@ -227,13 +227,14 @@ impl Default for KeywordSize {
 ///
 /// https://drafts.csswg.org/css-fonts-4/#font-style-prop
 #[allow(missing_docs)]
-#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf,
-         PartialEq, ToAnimatedValue, ToAnimatedZero)]
 #[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
+#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug, MallocSizeOf,
+         PartialEq, SpecifiedValueInfo, ToAnimatedValue, ToAnimatedZero)]
 pub enum FontStyle<Angle> {
     #[animation(error)]
     Normal,
     #[animation(error)]
     Italic,
+    #[value_info(starts_with_keyword)]
     Oblique(Angle),
 }
diff --git a/components/style/values/specified/font.rs b/components/style/values/specified/font.rs
index 13ca2280997..17ff3af6382 100644
--- a/components/style/values/specified/font.rs
+++ b/components/style/values/specified/font.rs
@@ -15,14 +15,16 @@ use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
 use parser::{Parse, ParserContext};
 use properties::longhands::system_font::SystemFont;
 use std::fmt::{self, Write};
-use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
+use style_traits::{CssWriter, KeywordsCollectFn, ParseError};
+use style_traits::{SpecifiedValueInfo, StyleParseErrorKind, ToCss};
+use style_traits::values::SequenceWriter;
 use values::CustomIdent;
 use values::computed::{Angle as ComputedAngle, Percentage as ComputedPercentage};
 use values::computed::{font as computed, Context, Length, NonNegativeLength, ToComputedValue};
 use values::computed::font::{FamilyName, FontFamilyList, FontStyleAngle, SingleFontFamily};
 use values::generics::NonNegative;
-use values::generics::font::{KeywordSize, VariationValue};
 use values::generics::font::{self as generics, FeatureTagValue, FontSettings, FontTag};
+use values::generics::font::{KeywordSize, VariationValue};
 use values::specified::{AllowQuirks, Angle, Integer, LengthOrPercentage, NoCalcLength, Number, Percentage};
 use values::specified::length::{FontBaseSize, AU_PER_PT, AU_PER_PX};