diff --git a/components/layout_2020/flexbox/layout.rs b/components/layout_2020/flexbox/layout.rs
index d2adec1d206..5be13f04bf7 100644
--- a/components/layout_2020/flexbox/layout.rs
+++ b/components/layout_2020/flexbox/layout.rs
@@ -30,7 +30,7 @@ use crate::fragment_tree::{BoxFragment, CollapsedBlockMargins, Fragment};
 use crate::geom::{AuOrAuto, LengthOrAuto, LogicalRect, LogicalSides, LogicalVec2};
 use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
 use crate::sizing::ContentSizes;
-use crate::style_ext::ComputedValuesExt;
+use crate::style_ext::{Clamp, ComputedValuesExt};
 use crate::ContainingBlock;
 
 // FIMXE: “Flex items […] `z-index` values other than `auto` create a stacking context
@@ -479,8 +479,8 @@ impl<'a> FlexItem<'a> {
                             .inline_size_over_block_size_intrinsic_ratio(box_.style())
                         {
                             inline_content_size.clamp_between_extremums(
-                                min_size.block.auto_is(|| Length::zero()) * ratio,
-                                max_size.block.map(|l| l * ratio),
+                                (min_size.block.auto_is(|| Length::zero()) * ratio).into(),
+                                max_size.block.map(|l| (l * ratio).into()),
                             )
                         } else {
                             inline_content_size
@@ -489,12 +489,12 @@ impl<'a> FlexItem<'a> {
                 };
 
                 let result = match specified_size_suggestion {
-                    LengthOrAuto::LengthPercentage(l) => l.min(content_size_suggestion),
+                    LengthOrAuto::LengthPercentage(l) => l.min(content_size_suggestion.into()),
                     LengthOrAuto::Auto => {
                         if let Some(l) = transferred_size_suggestion {
-                            l.min(content_size_suggestion)
+                            l.min(content_size_suggestion.into())
                         } else {
-                            content_size_suggestion
+                            content_size_suggestion.into()
                         }
                     },
                 };
@@ -625,6 +625,7 @@ fn flex_base_size(
                 flex_item
                     .inline_content_sizes(flex_context.layout_context)
                     .max_content
+                    .into()
             } else {
                 // FIXME: block-axis content sizing requires another pass
                 // of "full" layout
diff --git a/components/layout_2020/flow/float.rs b/components/layout_2020/flow/float.rs
index 6e553d296a3..18856db5fd2 100644
--- a/components/layout_2020/flow/float.rs
+++ b/components/layout_2020/flow/float.rs
@@ -915,7 +915,8 @@ impl FloatBox {
                                 containing_block.inline_size - pbm_sums.inline_sum();
                             non_replaced
                                 .inline_content_sizes(layout_context)
-                                .shrink_to_fit(available_size)
+                                .shrink_to_fit(available_size.into())
+                                .into()
                         });
                         let inline_size = tentative_inline_size
                             .clamp_between_extremums(min_box_size.inline, max_box_size.inline);
diff --git a/components/layout_2020/flow/inline.rs b/components/layout_2020/flow/inline.rs
index cefcef942b2..6b9e8669468 100644
--- a/components/layout_2020/flow/inline.rs
+++ b/components/layout_2020/flow/inline.rs
@@ -1828,7 +1828,8 @@ impl IndependentFormattingContext {
                     let available_size = ifc.containing_block.inline_size - pbm_sums.inline_sum();
                     non_replaced
                         .inline_content_sizes(layout_context)
-                        .shrink_to_fit(available_size)
+                        .shrink_to_fit(available_size.into())
+                        .into()
                 });
 
                 // https://drafts.csswg.org/css2/visudet.html#min-max-widths
@@ -2327,8 +2328,8 @@ impl<'a> ContentSizesComputation<'a> {
 
                     if !run.glyph_store.is_whitespace() {
                         self.had_non_whitespace_content_yet = true;
-                        self.current_line.min_content += advance;
-                        self.current_line.max_content += self.pending_whitespace + advance;
+                        self.current_line.min_content += advance.into();
+                        self.current_line.max_content += (self.pending_whitespace + advance).into();
                         self.pending_whitespace = Length::zero();
                     } else {
                         // If this run is a forced line break, we *must* break the line
@@ -2358,7 +2359,8 @@ impl<'a> ContentSizesComputation<'a> {
                     self.containing_block_writing_mode,
                 );
 
-                self.current_line.min_content += self.pending_whitespace + outer.min_content;
+                self.current_line.min_content +=
+                    (self.pending_whitespace + outer.min_content.into()).into();
                 self.current_line.max_content += outer.max_content;
                 self.pending_whitespace = Length::zero();
                 self.had_non_whitespace_content_yet = true;
@@ -2371,23 +2373,21 @@ impl<'a> ContentSizesComputation<'a> {
     }
 
     fn add_length(&mut self, l: Length) {
-        self.current_line.min_content += l;
-        self.current_line.max_content += l;
+        self.current_line.min_content += l.into();
+        self.current_line.max_content += l.into();
     }
 
     fn line_break_opportunity(&mut self) {
-        self.paragraph
-            .min_content
-            .max_assign(self.current_line.min_content);
-        self.current_line.min_content = Length::zero();
+        self.paragraph.min_content =
+            std::cmp::max(self.paragraph.min_content, self.current_line.min_content);
+        self.current_line.min_content = Au::zero();
     }
 
     fn forced_line_break(&mut self) {
         self.line_break_opportunity();
-        self.paragraph
-            .max_content
-            .max_assign(self.current_line.max_content);
-        self.current_line.max_content = Length::zero();
+        self.paragraph.max_content =
+            std::cmp::max(self.paragraph.max_content, self.current_line.max_content);
+        self.current_line.max_content = Au::zero();
     }
 
     /// Compute the [`ContentSizes`] of the given [`InlineFormattingContext`].
diff --git a/components/layout_2020/positioned.rs b/components/layout_2020/positioned.rs
index 56033731c42..4edc837c8e0 100644
--- a/components/layout_2020/positioned.rs
+++ b/components/layout_2020/positioned.rs
@@ -563,7 +563,8 @@ impl HoistedAbsolutelyPositionedBox {
                             cbis - anchor - pbm.padding_border_sums.inline - margin_sum;
                         non_replaced
                             .inline_content_sizes(layout_context)
-                            .shrink_to_fit(available_size)
+                            .shrink_to_fit(available_size.into())
+                            .into()
                     });
 
                     // If the tentative used inline size is greater than ‘max-inline-size’,
diff --git a/components/layout_2020/replaced.rs b/components/layout_2020/replaced.rs
index 885ef73d3e0..31147530da6 100644
--- a/components/layout_2020/replaced.rs
+++ b/components/layout_2020/replaced.rs
@@ -241,8 +241,8 @@ impl ReplacedContent {
             .inline
             .unwrap_or(Length::zero());
         ContentSizes {
-            min_content: inline,
-            max_content: inline,
+            min_content: inline.into(),
+            max_content: inline.into(),
         }
     }
 
diff --git a/components/layout_2020/sizing.rs b/components/layout_2020/sizing.rs
index f9b6912b4de..afabbbf2154 100644
--- a/components/layout_2020/sizing.rs
+++ b/components/layout_2020/sizing.rs
@@ -4,6 +4,7 @@
 
 //! <https://drafts.csswg.org/css-sizing/>
 
+use app_units::Au;
 use serde::Serialize;
 use style::logical_geometry::WritingMode;
 use style::properties::longhands::box_sizing::computed_value::T as BoxSizing;
@@ -11,24 +12,24 @@ use style::properties::ComputedValues;
 use style::values::computed::Length;
 use style::Zero;
 
-use crate::style_ext::ComputedValuesExt;
+use crate::style_ext::{Clamp, ComputedValuesExt};
 
 #[derive(Clone, Debug, Serialize)]
 pub(crate) struct ContentSizes {
-    pub min_content: Length,
-    pub max_content: Length,
+    pub min_content: Au,
+    pub max_content: Au,
 }
 
 /// <https://drafts.csswg.org/css-sizing/#intrinsic-sizes>
 impl ContentSizes {
     pub fn zero() -> Self {
         Self {
-            min_content: Length::zero(),
-            max_content: Length::zero(),
+            min_content: Au::zero(),
+            max_content: Au::zero(),
         }
     }
 
-    pub fn map(&self, f: impl Fn(Length) -> Length) -> Self {
+    pub fn map(&self, f: impl Fn(Au) -> Au) -> Self {
         Self {
             min_content: f(self.min_content),
             max_content: f(self.max_content),
@@ -52,7 +53,7 @@ impl ContentSizes {
 
 impl ContentSizes {
     /// <https://drafts.csswg.org/css2/visudet.html#shrink-to-fit-float>
-    pub fn shrink_to_fit(&self, available_size: Length) -> Length {
+    pub fn shrink_to_fit(&self, available_size: Au) -> Au {
         available_size.max(self.min_content).min(self.max_content)
     }
 }
@@ -100,28 +101,30 @@ pub(crate) fn outer_inline(
         .inline
         // Percentages for 'max-width' are treated as 'none'
         .and_then(|lp| lp.to_length());
-    let clamp = |l: Length| l.clamp_between_extremums(min_inline_size, max_inline_size);
+    let clamp = |l: Au| {
+        l.clamp_between_extremums(min_inline_size.into(), max_inline_size.map(|t| t.into()))
+    };
 
     let border_box_sizes = match inline_size {
         Some(non_auto) => {
-            let clamped = clamp(non_auto);
+            let clamped = clamp(non_auto.into());
             let border_box_size = match box_sizing {
-                BoxSizing::ContentBox => clamped + pb_lengths,
+                BoxSizing::ContentBox => clamped + pb_lengths.into(),
                 BoxSizing::BorderBox => clamped,
             };
             ContentSizes {
-                min_content: border_box_size,
-                max_content: border_box_size,
+                min_content: border_box_size.into(),
+                max_content: border_box_size.into(),
             }
         },
         None => get_content_size().map(|content_box_size| {
             match box_sizing {
                 // Clamp to 'min-width' and 'max-width', which are sizing the…
-                BoxSizing::ContentBox => clamp(content_box_size) + pb_lengths,
-                BoxSizing::BorderBox => clamp(content_box_size + pb_lengths),
+                BoxSizing::ContentBox => clamp(content_box_size.into()) + pb_lengths.into(),
+                BoxSizing::BorderBox => clamp(content_box_size + pb_lengths.into()),
             }
         }),
     };
 
-    border_box_sizes.map(|s| s + m_lengths)
+    border_box_sizes.map(|s| s + m_lengths.into())
 }
diff --git a/components/layout_2020/table/layout.rs b/components/layout_2020/table/layout.rs
index 662c561335a..1c4fab51f4f 100644
--- a/components/layout_2020/table/layout.rs
+++ b/components/layout_2020/table/layout.rs
@@ -95,7 +95,7 @@ impl<'a> TableLayout<'a> {
 
         // https://drafts.csswg.org/css-tables/#used-min-width-of-table
         // > The used min-width of a table is the greater of the resolved min-width, CAPMIN, and GRIDMIN.
-        let used_min_width_of_table = grid_min_inline_size.max(min_content_sizes.inline);
+        let used_min_width_of_table = grid_min_inline_size.max(min_content_sizes.inline.into());
 
         // https://drafts.csswg.org/css-tables/#used-width-of-table
         // > The used width of a table depends on the columns and captions widths as follows:
@@ -105,10 +105,13 @@ impl<'a> TableLayout<'a> {
         // > * If the table-root has 'width: auto', the used width is the greater of min(GRIDMAX,
         // >   the table’s containing block width), the used min-width of the table.
         let used_width_of_table = match content_box_size.inline {
-            LengthPercentage(length_percentage) => length_percentage.max(used_min_width_of_table),
+            LengthPercentage(length_percentage) => {
+                length_percentage.max(used_min_width_of_table.into())
+            },
             Auto => grid_max_inline_size
-                .min(containing_block.inline_size)
-                .max(used_min_width_of_table),
+                .min(containing_block.inline_size.into())
+                .max(used_min_width_of_table)
+                .into(),
         };
 
         self.assignable_width = used_width_of_table.into();
@@ -185,8 +188,11 @@ impl<'a> TableLayout<'a> {
                 max_content_sizing_guess,
             ) = match inline_size {
                 LengthPercentage(length_percentage) if length_percentage.has_percentage() => {
-                    let percent_guess = min_content_width
-                        .max(length_percentage.resolve(self.assignable_width.into()));
+                    let percent_guess = min_content_width.max(
+                        length_percentage
+                            .resolve(self.assignable_width.into())
+                            .into(),
+                    );
                     (percent_guess, percent_guess, percent_guess)
                 },
                 LengthPercentage(_) => (min_content_width, max_content_width, max_content_width),
@@ -450,7 +456,7 @@ impl Table {
         };
 
         let sizes = cell.inline_content_sizes(layout_context, writing_mode);
-        sizes.map(|size| size / cell.colspan as f32)
+        sizes.map(|size| size.scale_by(1.0 / cell.colspan as f32))
     }
 
     pub(crate) fn compute_inline_content_sizes(
@@ -520,8 +526,8 @@ impl TableSlotCell {
             .contents
             .contents
             .inline_content_sizes(layout_context, writing_mode);
-        sizes.min_content += border_padding_sum;
-        sizes.max_content += border_padding_sum;
+        sizes.min_content += border_padding_sum.into();
+        sizes.max_content += border_padding_sum.into();
         sizes
     }
 
diff --git a/tests/wpt/meta/css/CSS2/floats-clear/floats-141.xht.ini b/tests/wpt/meta/css/CSS2/floats-clear/floats-141.xht.ini
deleted file mode 100644
index 0ad11b3c5cb..00000000000
--- a/tests/wpt/meta/css/CSS2/floats-clear/floats-141.xht.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[floats-141.xht]
-  expected: FAIL