diff --git a/components/style/values/computed/border.rs b/components/style/values/computed/border.rs
index e85b5a3e5d6..7b42dd0e879 100644
--- a/components/style/values/computed/border.rs
+++ b/components/style/values/computed/border.rs
@@ -12,7 +12,7 @@ use crate::values::generics::border::BorderImageSlice as GenericBorderImageSlice
 use crate::values::generics::border::BorderRadius as GenericBorderRadius;
 use crate::values::generics::border::BorderSpacing as GenericBorderSpacing;
 use crate::values::generics::rect::Rect;
-use crate::values::generics::size::Size;
+use crate::values::generics::size::Size2D;
 use crate::values::generics::NonNegative;
 use app_units::Au;
 
@@ -59,7 +59,7 @@ impl BorderImageSlice {
 impl BorderSpacing {
     /// Returns `0 0`.
     pub fn zero() -> Self {
-        GenericBorderSpacing(Size::new(
+        GenericBorderSpacing(Size2D::new(
             NonNegativeLength::zero(),
             NonNegativeLength::zero(),
         ))
@@ -79,7 +79,7 @@ impl BorderSpacing {
 impl BorderCornerRadius {
     /// Returns `0 0`.
     pub fn zero() -> Self {
-        GenericBorderCornerRadius(Size::new(
+        GenericBorderCornerRadius(Size2D::new(
             NonNegativeLengthPercentage::zero(),
             NonNegativeLengthPercentage::zero(),
         ))
diff --git a/components/style/values/generics/border.rs b/components/style/values/generics/border.rs
index a722548e732..148f74e3834 100644
--- a/components/style/values/generics/border.rs
+++ b/components/style/values/generics/border.rs
@@ -5,7 +5,7 @@
 //! Generic types for CSS values related to borders.
 
 use crate::values::generics::rect::Rect;
-use crate::values::generics::size::Size;
+use crate::values::generics::size::Size2D;
 use std::fmt::{self, Write};
 use style_traits::{CssWriter, ToCss};
 
@@ -53,12 +53,12 @@ pub use self::GenericBorderImageSlice as BorderImageSlice;
     ToComputedValue,
     ToCss,
 )]
-pub struct BorderCornerRadius<L>(#[css(field_bound)] pub Size<L>);
+pub struct BorderCornerRadius<L>(#[css(field_bound)] pub Size2D<L>);
 
 impl<L> BorderCornerRadius<L> {
     /// Trivially create a `BorderCornerRadius`.
     pub fn new(w: L, h: L) -> Self {
-        BorderCornerRadius(Size::new(w, h))
+        BorderCornerRadius(Size2D::new(w, h))
     }
 }
 
@@ -77,12 +77,12 @@ impl<L> BorderCornerRadius<L> {
     ToComputedValue,
     ToCss,
 )]
-pub struct BorderSpacing<L>(#[css(field_bound)] pub Size<L>);
+pub struct BorderSpacing<L>(#[css(field_bound)] pub Size2D<L>);
 
 impl<L> BorderSpacing<L> {
     /// Trivially create a `BorderCornerRadius`.
     pub fn new(w: L, h: L) -> Self {
-        BorderSpacing(Size::new(w, h))
+        BorderSpacing(Size2D::new(w, h))
     }
 }
 
@@ -168,8 +168,8 @@ where
             bottom_left: BorderCornerRadius(ref bl),
         } = *self;
 
-        let widths = Rect::new(&tl.0.width, &tr.0.width, &br.0.width, &bl.0.width);
-        let heights = Rect::new(&tl.0.height, &tr.0.height, &br.0.height, &bl.0.height);
+        let widths = Rect::new(&tl.width, &tr.width, &br.width, &bl.width);
+        let heights = Rect::new(&tl.height, &tr.height, &br.height, &bl.height);
 
         Self::serialize_rects(widths, heights, dest)
     }
diff --git a/components/style/values/generics/size.rs b/components/style/values/generics/size.rs
index a5a5c86eac6..c67d6e82781 100644
--- a/components/style/values/generics/size.rs
+++ b/components/style/values/generics/size.rs
@@ -5,11 +5,9 @@
 //! Generic type for CSS properties that are composed by two dimensions.
 
 use crate::parser::ParserContext;
-use crate::values::animated::ToAnimatedValue;
 use cssparser::Parser;
-use euclid::Size2D;
 use std::fmt::{self, Write};
-use style_traits::{CssWriter, ParseError, SpecifiedValueInfo, ToCss};
+use style_traits::{CssWriter, ParseError, ToCss};
 
 /// A generic size, for `border-*-radius` longhand properties, or
 /// `border-spacing`.
@@ -21,29 +19,35 @@ use style_traits::{CssWriter, ParseError, SpecifiedValueInfo, ToCss};
     Debug,
     MallocSizeOf,
     PartialEq,
+    SpecifiedValueInfo,
     ToAnimatedZero,
+    ToAnimatedValue,
     ToComputedValue,
 )]
-pub struct Size<L>(pub Size2D<L>);
+#[allow(missing_docs)]
+pub struct Size2D<L> {
+    pub width: L,
+    pub height: L,
+}
 
-impl<L> Size<L> {
+impl<L> Size2D<L> {
     #[inline]
-    /// Create a new `Size` for an area of given width and height.
-    pub fn new(width: L, height: L) -> Size<L> {
-        Size(Size2D::new(width, height))
+    /// Create a new `Size2D` for an area of given width and height.
+    pub fn new(width: L, height: L) -> Self {
+        Self { width, height }
     }
 
     /// Returns the width component.
     pub fn width(&self) -> &L {
-        &self.0.width
+        &self.width
     }
 
     /// Returns the height component.
     pub fn height(&self) -> &L {
-        &self.0.height
+        &self.height
     }
 
-    /// Parse a `Size` with a given parsing function.
+    /// Parse a `Size2D` with a given parsing function.
     pub fn parse_with<'i, 't, F>(
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
@@ -61,7 +65,7 @@ impl<L> Size<L> {
     }
 }
 
-impl<L> ToCss for Size<L>
+impl<L> ToCss for Size2D<L>
 where
     L: ToCss + PartialEq,
 {
@@ -69,40 +73,13 @@ where
     where
         W: Write,
     {
-        self.0.width.to_css(dest)?;
+        self.width.to_css(dest)?;
 
-        if self.0.height != self.0.width {
+        if self.height != self.width {
             dest.write_str(" ")?;
-            self.0.height.to_css(dest)?;
+            self.height.to_css(dest)?;
         }
 
         Ok(())
     }
 }
-
-impl<L> ToAnimatedValue for Size<L>
-where
-    L: ToAnimatedValue,
-{
-    type AnimatedValue = Size<L::AnimatedValue>;
-
-    #[inline]
-    fn to_animated_value(self) -> Self::AnimatedValue {
-        Size(Size2D::new(
-            self.0.width.to_animated_value(),
-            self.0.height.to_animated_value(),
-        ))
-    }
-
-    #[inline]
-    fn from_animated_value(animated: Self::AnimatedValue) -> Self {
-        Size(Size2D::new(
-            L::from_animated_value(animated.0.width),
-            L::from_animated_value(animated.0.height),
-        ))
-    }
-}
-
-impl<L: SpecifiedValueInfo> SpecifiedValueInfo for Size<L> {
-    const SUPPORTED_TYPES: u8 = L::SUPPORTED_TYPES;
-}
diff --git a/components/style/values/specified/border.rs b/components/style/values/specified/border.rs
index e16d37b4786..0b1e9026b8e 100644
--- a/components/style/values/specified/border.rs
+++ b/components/style/values/specified/border.rs
@@ -12,7 +12,7 @@ use crate::values::generics::border::BorderImageSlice as GenericBorderImageSlice
 use crate::values::generics::border::BorderRadius as GenericBorderRadius;
 use crate::values::generics::border::BorderSpacing as GenericBorderSpacing;
 use crate::values::generics::rect::Rect;
-use crate::values::generics::size::Size;
+use crate::values::generics::size::Size2D;
 use crate::values::specified::length::{NonNegativeLength, NonNegativeLengthPercentage};
 use crate::values::specified::{AllowQuirks, NonNegativeNumber, NonNegativeNumberOrPercentage};
 use cssparser::Parser;
@@ -228,7 +228,7 @@ impl Parse for BorderCornerRadius {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
-        Size::parse_with(context, input, NonNegativeLengthPercentage::parse)
+        Size2D::parse_with(context, input, NonNegativeLengthPercentage::parse)
             .map(GenericBorderCornerRadius)
     }
 }
@@ -238,7 +238,7 @@ impl Parse for BorderSpacing {
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
-        Size::parse_with(context, input, |context, input| {
+        Size2D::parse_with(context, input, |context, input| {
             NonNegativeLength::parse_quirky(context, input, AllowQuirks::Yes).map(From::from)
         })
         .map(GenericBorderSpacing)