diff --git a/components/layout_2020/flow/mod.rs b/components/layout_2020/flow/mod.rs
index 7138ffe3eb0..f877e702dfe 100644
--- a/components/layout_2020/flow/mod.rs
+++ b/components/layout_2020/flow/mod.rs
@@ -411,7 +411,7 @@ fn layout_in_flow_non_replaced_block_level<'a>(
     // https://drafts.csswg.org/css2/visudet.html#min-max-heights
     let mut block_size = box_size.block;
     if let LengthOrAuto::LengthPercentage(ref mut block_size) = block_size {
-        *block_size = clamp_between_extremums(*block_size, min_box_size.block, max_box_size.block);
+        *block_size = block_size.clamp_between_extremums(min_box_size.block, max_box_size.block);
     }
 
     let containing_block_for_children = ContainingBlock {
@@ -475,11 +475,9 @@ fn layout_in_flow_non_replaced_block_level<'a>(
                 .collapsed_through;
     let relative_adjustement = relative_adjustement(style, inline_size, block_size);
     let block_size = block_size.auto_is(|| {
-        clamp_between_extremums(
-            flow_layout.content_block_size,
-            min_box_size.block,
-            max_box_size.block,
-        )
+        flow_layout
+            .content_block_size
+            .clamp_between_extremums(min_box_size.block, max_box_size.block)
     });
     let content_rect = Rect {
         start_corner: Vec2 {
@@ -536,10 +534,10 @@ fn layout_in_flow_replaced_block_level<'a>(
         percent_resolved_box_size(style.min_box_size(), containing_block).auto_is(Length::zero);
     let max_box_size = percent_resolved_max_box_size(style.max_box_size(), containing_block);
 
-    let clamp = |inline_size, block_size| {
+    let clamp = |inline_size: Length, block_size: Length| {
         (
-            clamp_between_extremums(inline_size, min_box_size.inline, max_box_size.inline),
-            clamp_between_extremums(block_size, min_box_size.block, max_box_size.block),
+            inline_size.clamp_between_extremums(min_box_size.inline, max_box_size.inline),
+            block_size.clamp_between_extremums(min_box_size.block, max_box_size.block),
         )
     };
     // https://drafts.csswg.org/css2/visudet.html#min-max-widths
@@ -590,7 +588,7 @@ fn layout_in_flow_replaced_block_level<'a>(
                 // Row 3.
                 (Violation::Below(min_inline_size), Violation::None) => {
                     let block_size =
-                        clamp_below_max(min_inline_size / intrinsic_ratio, max_box_size.block);
+                        (min_inline_size / intrinsic_ratio).clamp_below_max(max_box_size.block);
                     (min_inline_size, block_size)
                 },
                 // Row 4.
@@ -601,7 +599,7 @@ fn layout_in_flow_replaced_block_level<'a>(
                 // Row 5.
                 (Violation::None, Violation::Below(min_block_size)) => {
                     let inline_size =
-                        clamp_below_max(min_block_size * intrinsic_ratio, max_box_size.inline);
+                        (min_block_size * intrinsic_ratio).clamp_below_max(max_box_size.inline);
                     (inline_size, min_block_size)
                 },
                 // Rows 6-7.
@@ -627,12 +625,12 @@ fn layout_in_flow_replaced_block_level<'a>(
                     {
                         // Row 8.
                         let inline_size =
-                            clamp_below_max(min_block_size * intrinsic_ratio, max_box_size.inline);
+                            (min_block_size * intrinsic_ratio).clamp_below_max(max_box_size.inline);
                         (inline_size, min_block_size)
                     } else {
                         // Row 9.
                         let block_size =
-                            clamp_below_max(min_inline_size / intrinsic_ratio, max_box_size.block);
+                            (min_inline_size / intrinsic_ratio).clamp_below_max(max_box_size.block);
                         (min_inline_size, block_size)
                     }
                 },
@@ -704,14 +702,6 @@ fn solve_inline_margins_for_in_flow_block_level(
     }
 }
 
-fn clamp_between_extremums(size: Length, min_size: Length, max_size: Option<Length>) -> Length {
-    clamp_below_max(size, max_size).max(min_size)
-}
-
-fn clamp_below_max(size: Length, max_size: Option<Length>) -> Length {
-    max_size.map_or(size, |max_size| size.min(max_size))
-}
-
 fn percent_resolved_box_size(
     box_size: Vec2<LengthPercentageOrAuto>,
     containing_block: &ContainingBlock,
diff --git a/components/style/values/computed/length.rs b/components/style/values/computed/length.rs
index 06631a354df..2423d447a6a 100644
--- a/components/style/values/computed/length.rs
+++ b/components/style/values/computed/length.rs
@@ -657,14 +657,14 @@ impl CSSPixelLength {
 
     /// Return the containing pixel value.
     #[inline]
-    pub fn px(&self) -> CSSFloat {
+    pub fn px(self) -> CSSFloat {
         self.0
     }
 
     /// Return the length with app_unit i32 type.
     #[inline]
-    pub fn to_i32_au(&self) -> i32 {
-        Au::from(*self).0
+    pub fn to_i32_au(self) -> i32 {
+        Au::from(self).0
     }
 
     /// Return the absolute value of this length.
@@ -692,9 +692,29 @@ impl CSSPixelLength {
     }
 
     /// Sets `self` to the maximum between `self` and `other`.
+    #[inline]
     pub fn max_assign(&mut self, other: Self) {
         *self = self.max(other);
     }
+
+    /// Clamp the value to a lower bound and an optional upper bound.
+    ///
+    /// Can be used for example with `min-width` and `max-width`.
+    #[inline]
+    pub fn clamp_between_extremums(self, min_size: Self, max_size: Option<Self>) -> Self {
+        self.clamp_below_max(max_size).max(min_size)
+    }
+
+    /// Clamp the value to an optional upper bound.
+    ///
+    /// Can be used for example with `max-width`.
+    #[inline]
+    pub fn clamp_below_max(self, max_size: Option<Self>) -> Self {
+        match max_size {
+            None => self,
+            Some(max_size) => self.min(max_size),
+        }
+    }
 }
 
 impl Zero for CSSPixelLength {