diff --git a/components/layout_2020/geom.rs b/components/layout_2020/geom.rs
index 562fad5c4f6..16df6a9c0a7 100644
--- a/components/layout_2020/geom.rs
+++ b/components/layout_2020/geom.rs
@@ -175,13 +175,14 @@ impl flow_relative::Vec2<MaxSize<LengthPercentage>> {
         containing_block: &ContainingBlock,
     ) -> flow_relative::Vec2<Option<Length>> {
         flow_relative::Vec2 {
-            inline: self
-                .inline
-                .to_option()
-                .map(|lp| lp.percentage_relative_to(containing_block.inline_size)),
-            block: self.block.to_option().and_then(|olp| {
-                olp.maybe_percentage_relative_to(containing_block.block_size.non_auto())
-            }),
+            inline: match self.inline {
+                MaxSize::None => None,
+                MaxSize::LengthPercentage(ref lp) => Some(lp.percentage_relative_to(containing_block.inline_size)),
+            },
+            block: match self.block {
+                MaxSize::None => None,
+                MaxSize::LengthPercentage(ref lp) => lp.maybe_percentage_relative_to(containing_block.block_size.non_auto()),
+            },
         }
     }
 }
diff --git a/components/layout_2020/positioned.rs b/components/layout_2020/positioned.rs
index c9ad2dd97c4..b10b489bc1d 100644
--- a/components/layout_2020/positioned.rs
+++ b/components/layout_2020/positioned.rs
@@ -40,7 +40,7 @@ pub(crate) struct HoistedAbsolutelyPositionedBox<'box_tree> {
     box_offsets: Vec2<AbsoluteBoxOffsets>,
 }
 
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Debug)]
 pub(crate) enum AbsoluteBoxOffsets {
     StaticStart {
         start: Length,
@@ -113,13 +113,13 @@ impl AbsolutelyPositionedBox {
             box_offsets: Vec2 {
                 inline: absolute_box_offsets(
                     initial_start_corner.inline,
-                    box_offsets.inline_start,
-                    box_offsets.inline_end,
+                    box_offsets.inline_start.clone(),
+                    box_offsets.inline_end.clone(),
                 ),
                 block: absolute_box_offsets(
                     initial_start_corner.block,
-                    box_offsets.block_start,
-                    box_offsets.block_end,
+                    box_offsets.block_start.clone(),
+                    box_offsets.block_end.clone(),
                 ),
             },
         }
@@ -372,20 +372,20 @@ impl<'box_tree> HoistedAbsolutelyPositionedBox<'box_tree> {
         let inline_axis = solve_axis(
             cbis,
             pb.inline_sum(),
-            computed_margin.inline_start,
-            computed_margin.inline_end,
+            computed_margin.inline_start.clone(),
+            computed_margin.inline_end.clone(),
             /* avoid_negative_margin_start */ true,
-            self.box_offsets.inline,
+            self.box_offsets.inline.clone(),
             size.inline,
         );
 
         let block_axis = solve_axis(
             cbis,
             pb.block_sum(),
-            computed_margin.block_start,
-            computed_margin.block_end,
+            computed_margin.block_start.clone(),
+            computed_margin.block_end.clone(),
             /* avoid_negative_margin_start */ false,
-            self.box_offsets.block,
+            self.box_offsets.block.clone(),
             size.block,
         );
 
diff --git a/components/layout_2020/sizing.rs b/components/layout_2020/sizing.rs
index e3c74d3733f..dc7513a7859 100644
--- a/components/layout_2020/sizing.rs
+++ b/components/layout_2020/sizing.rs
@@ -7,6 +7,7 @@
 use crate::style_ext::ComputedValuesExt;
 use style::properties::ComputedValues;
 use style::values::computed::{Length, LengthPercentage, Percentage};
+use style::values::generics::length::MaxSize;
 use style::Zero;
 
 /// Which min/max-content values should be computed during box construction
@@ -114,11 +115,10 @@ impl BoxContentSizes {
             .inline
             .percentage_relative_to(Length::zero())
             .auto_is(Length::zero);
-        let max_inline_size = style
-            .max_box_size()
-            .inline
-            .to_option()
-            .and_then(|lp| lp.as_length());
+        let max_inline_size = match style.max_box_size().inline {
+            MaxSize::None => None,
+            MaxSize::LengthPercentage(ref lp) => lp.as_length(),
+        };
         let clamp = |l: Length| l.clamp_between_extremums(min_inline_size, max_inline_size);
 
         // Percentages for 'width' are treated as 'auto'
diff --git a/components/layout_2020/style_ext.rs b/components/layout_2020/style_ext.rs
index 67d8bc78d7e..b232381add2 100644
--- a/components/layout_2020/style_ext.rs
+++ b/components/layout_2020/style_ext.rs
@@ -55,9 +55,9 @@ impl ComputedValuesExt for ComputedValues {
     fn inline_size_is_length(&self) -> bool {
         let position = self.get_position();
         let size = if self.writing_mode.is_horizontal() {
-            position.width
+            &position.width
         } else {
-            position.height
+            &position.height
         };
         matches!(size, Size::LengthPercentage(lp) if lp.0.as_length().is_some())
     }
@@ -65,21 +65,21 @@ impl ComputedValuesExt for ComputedValues {
     fn inline_box_offsets_are_both_non_auto(&self) -> bool {
         let position = self.get_position();
         let (a, b) = if self.writing_mode.is_horizontal() {
-            (position.left, position.right)
+            (&position.left, &position.right)
         } else {
-            (position.top, position.bottom)
+            (&position.top, &position.bottom)
         };
-        a != LengthPercentageOrAuto::Auto && b != LengthPercentageOrAuto::Auto
+        !a.is_auto() && !b.is_auto()
     }
 
     #[inline]
     fn box_offsets(&self) -> flow_relative::Sides<LengthPercentageOrAuto> {
         let position = self.get_position();
         physical::Sides {
-            top: position.top,
-            left: position.left,
-            bottom: position.bottom,
-            right: position.right,
+            top: position.top.clone(),
+            left: position.left.clone(),
+            bottom: position.bottom.clone(),
+            right: position.right.clone(),
         }
         .to_flow_relative(self.writing_mode)
     }
@@ -88,8 +88,8 @@ impl ComputedValuesExt for ComputedValues {
     fn box_size(&self) -> flow_relative::Vec2<LengthPercentageOrAuto> {
         let position = self.get_position();
         physical::Vec2 {
-            x: size_to_length(position.width),
-            y: size_to_length(position.height),
+            x: size_to_length(position.width.clone()),
+            y: size_to_length(position.height.clone()),
         }
         .size_to_flow_relative(self.writing_mode)
     }
@@ -98,8 +98,8 @@ impl ComputedValuesExt for ComputedValues {
     fn min_box_size(&self) -> flow_relative::Vec2<LengthPercentageOrAuto> {
         let position = self.get_position();
         physical::Vec2 {
-            x: size_to_length(position.min_width),
-            y: size_to_length(position.min_height),
+            x: size_to_length(position.min_width.clone()),
+            y: size_to_length(position.min_height.clone()),
         }
         .size_to_flow_relative(self.writing_mode)
     }
@@ -112,8 +112,8 @@ impl ComputedValuesExt for ComputedValues {
         };
         let position = self.get_position();
         physical::Vec2 {
-            x: unwrap(position.max_width),
-            y: unwrap(position.max_height),
+            x: unwrap(position.max_width.clone()),
+            y: unwrap(position.max_height.clone()),
         }
         .size_to_flow_relative(self.writing_mode)
     }
@@ -122,10 +122,10 @@ impl ComputedValuesExt for ComputedValues {
     fn padding(&self) -> flow_relative::Sides<LengthPercentage> {
         let padding = self.get_padding();
         physical::Sides {
-            top: padding.padding_top.0,
-            left: padding.padding_left.0,
-            bottom: padding.padding_bottom.0,
-            right: padding.padding_right.0,
+            top: padding.padding_top.0.clone(),
+            left: padding.padding_left.0.clone(),
+            bottom: padding.padding_bottom.0.clone(),
+            right: padding.padding_right.0.clone(),
         }
         .to_flow_relative(self.writing_mode)
     }
@@ -144,10 +144,10 @@ impl ComputedValuesExt for ComputedValues {
     fn margin(&self) -> flow_relative::Sides<LengthPercentageOrAuto> {
         let margin = self.get_margin();
         physical::Sides {
-            top: margin.margin_top,
-            left: margin.margin_left,
-            bottom: margin.margin_bottom,
-            right: margin.margin_right,
+            top: margin.margin_top.clone(),
+            left: margin.margin_left.clone(),
+            bottom: margin.margin_bottom.clone(),
+            right: margin.margin_right.clone(),
         }
         .to_flow_relative(self.writing_mode)
     }
@@ -180,7 +180,7 @@ impl From<stylo::Display> for Display {
 
 fn size_to_length(size: Size) -> LengthPercentageOrAuto {
     match size {
-        Size::LengthPercentage(length) => LengthPercentageOrAuto::LengthPercentage(length.0),
+        Size::LengthPercentage(length) => LengthPercentageOrAuto::LengthPercentage(length.0.clone()),
         Size::Auto => LengthPercentageOrAuto::Auto,
     }
 }
diff --git a/components/style/values/generics/length.rs b/components/style/values/generics/length.rs
index b2f34058283..4183f40a942 100644
--- a/components/style/values/generics/length.rs
+++ b/components/style/values/generics/length.rs
@@ -207,15 +207,6 @@ impl<LengthPercentage> MaxSize<LengthPercentage> {
     pub fn none() -> Self {
         MaxSize::None
     }
-
-    /// Convert
-    #[cfg(not(feature = "gecko"))]
-    pub fn to_option(self) -> Option<LengthPercentage> {
-        match self {
-            Self::LengthPercentage(lp) => Some(lp),
-            Self::None => None,
-        }
-    }
 }
 
 /// A generic `<length>` | `<number>` value for the `-moz-tab-size` property.