diff --git a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
index 1cd65d21fe..37f752107b 100644
--- a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
+++ b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
@@ -1134,7 +1134,7 @@ void BlockFormattingContext::layout_list_item_marker(ListItemBox const& list_ite
     }
 
     auto offset_y = max(CSSPixels(0), (marker.computed_values().line_height() - marker_state.content_height()) / 2);
-    auto space_and_containing_margin = intrusion_by_floats_into_box(list_item_box, offset_y);
+    auto space_and_containing_margin = intrusion_by_floats_into_box(list_item_state, offset_y);
     marker_state.set_content_offset({ space_and_containing_margin.left - final_marker_width, offset_y });
 
     if (marker_state.content_height() > list_item_state.content_height())
@@ -1183,9 +1183,13 @@ BlockFormattingContext::SpaceUsedAndContainingMarginForFloats BlockFormattingCon
 }
 
 FormattingContext::SpaceUsedByFloats BlockFormattingContext::intrusion_by_floats_into_box(Box const& box, CSSPixels y_in_box) const
+{
+    return intrusion_by_floats_into_box(m_state.get(box), y_in_box);
+}
+
+FormattingContext::SpaceUsedByFloats BlockFormattingContext::intrusion_by_floats_into_box(LayoutState::UsedValues const& box_used_values, CSSPixels y_in_box) const
 {
     // NOTE: Floats are relative to the BFC root box, not necessarily the containing block of this IFC.
-    auto& box_used_values = m_state.get(box);
     auto box_in_root_rect = content_box_rect_in_ancestor_coordinate_space(box_used_values, root());
     CSSPixels y_in_root = box_in_root_rect.y() + y_in_box;
     auto space_and_containing_margin = space_used_and_containing_margin_for_floats(y_in_root);
diff --git a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.h b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.h
index 3eb3789657..0fd1306b66 100644
--- a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.h
+++ b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.h
@@ -42,7 +42,8 @@ public:
     void add_absolutely_positioned_box(Box const& box) { m_absolutely_positioned_boxes.append(box); }
 
     SpaceUsedAndContainingMarginForFloats space_used_and_containing_margin_for_floats(CSSPixels y) const;
-    SpaceUsedByFloats intrusion_by_floats_into_box(Box const&, CSSPixels y_in_box) const;
+    [[nodiscard]] SpaceUsedByFloats intrusion_by_floats_into_box(Box const&, CSSPixels y_in_box) const;
+    [[nodiscard]] SpaceUsedByFloats intrusion_by_floats_into_box(LayoutState::UsedValues const&, CSSPixels y_in_box) const;
 
     virtual CSSPixels greatest_child_width(Box const&) const override;
 
diff --git a/Userland/Libraries/LibWeb/Layout/InlineFormattingContext.cpp b/Userland/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
index 9e7f1c811d..87a40b5b5a 100644
--- a/Userland/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
+++ b/Userland/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
@@ -55,7 +55,7 @@ CSSPixels InlineFormattingContext::leftmost_x_offset_at(CSSPixels y) const
 
 AvailableSize InlineFormattingContext::available_space_for_line(CSSPixels y) const
 {
-    auto intrusions = parent().intrusion_by_floats_into_box(containing_block(), y);
+    auto intrusions = parent().intrusion_by_floats_into_box(m_containing_block_state, y);
     if (m_available_space->width.is_definite()) {
         return AvailableSize::make_definite(m_available_space->width.to_px_or_zero() - (intrusions.left + intrusions.right));
     } else {
@@ -379,8 +379,8 @@ bool InlineFormattingContext::any_floats_intrude_at_y(CSSPixels y) const
 
 bool InlineFormattingContext::can_fit_new_line_at_y(CSSPixels y) const
 {
-    auto top_intrusions = parent().intrusion_by_floats_into_box(containing_block(), y);
-    auto bottom_intrusions = parent().intrusion_by_floats_into_box(containing_block(), y + containing_block().computed_values().line_height() - 1);
+    auto top_intrusions = parent().intrusion_by_floats_into_box(m_containing_block_state, y);
+    auto bottom_intrusions = parent().intrusion_by_floats_into_box(m_containing_block_state, y + containing_block().computed_values().line_height() - 1);
 
     auto left_edge = [](auto& space) -> CSSPixels {
         return space.left;