diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index 179a536eb9..cec6ceb6d2 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -69,6 +69,7 @@ set(SOURCES
     CSS/StyleValues/BackgroundSizeStyleValue.cpp
     CSS/StyleValues/BackgroundStyleValue.cpp
     CSS/StyleValues/BorderRadiusShorthandStyleValue.cpp
+    CSS/StyleValues/BorderRadiusStyleValue.cpp
     CSS/StyleValues/BorderStyleValue.cpp
     CSS/Supports.cpp
     CSS/SyntaxHighlighter/SyntaxHighlighter.cpp
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 418f5428f0..c5c0b64109 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -34,6 +34,7 @@
 #include <LibWeb/CSS/StyleValues/BackgroundSizeStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BackgroundStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h>
+#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/Dump.h>
diff --git a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
index 0113ab2e97..82275d8583 100644
--- a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
+++ b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
@@ -15,6 +15,7 @@
 #include <LibWeb/CSS/StyleValues/BackgroundRepeatStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BackgroundStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h>
+#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Element.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
index a8ab94605a..496e76ccc5 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
@@ -27,6 +27,7 @@
 #include <LibWeb/CSS/StyleSheet.h>
 #include <LibWeb/CSS/StyleValues/BackgroundStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h>
+#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Element.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
index 623138e425..a8e61df653 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
@@ -16,6 +16,7 @@
 #include <LibWeb/CSS/StyleValues/BackgroundSizeStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BackgroundStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h>
+#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BorderStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/BrowsingContext.h>
@@ -296,13 +297,6 @@ StyleValueList const& StyleValue::as_value_list() const
     return static_cast<StyleValueList const&>(*this);
 }
 
-ErrorOr<String> BorderRadiusStyleValue::to_string() const
-{
-    if (m_properties.horizontal_radius == m_properties.vertical_radius)
-        return m_properties.horizontal_radius.to_string();
-    return String::formatted("{} / {}", TRY(m_properties.horizontal_radius.to_string()), TRY(m_properties.vertical_radius.to_string()));
-}
-
 void CalculatedStyleValue::CalculationResult::add(CalculationResult const& other, Layout::Node const* layout_node, PercentageBasis const& percentage_basis)
 {
     add_or_subtract_internal(SumOperation::Add, other, layout_node, percentage_basis);
@@ -2158,7 +2152,7 @@ ValueComparingNonnullRefPtr<LengthStyleValue> LengthStyleValue::create(Length co
     return adopt_ref(*new LengthStyleValue(length));
 }
 
-static Optional<CSS::Length> absolutized_length(CSS::Length const& length, CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height)
+Optional<CSS::Length> absolutized_length(CSS::Length const& length, CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height)
 {
     if (length.is_px())
         return {};
@@ -2190,19 +2184,6 @@ ValueComparingNonnullRefPtr<StyleValue const> ShadowStyleValue::absolutized(CSSP
     return ShadowStyleValue::create(m_properties.color, absolutized_offset_x, absolutized_offset_y, absolutized_blur_radius, absolutized_spread_distance, m_properties.placement);
 }
 
-ValueComparingNonnullRefPtr<StyleValue const> BorderRadiusStyleValue::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
-{
-    if (m_properties.horizontal_radius.is_percentage() && m_properties.vertical_radius.is_percentage())
-        return *this;
-    auto absolutized_horizontal_radius = m_properties.horizontal_radius;
-    auto absolutized_vertical_radius = m_properties.vertical_radius;
-    if (!m_properties.horizontal_radius.is_percentage())
-        absolutized_horizontal_radius = absolutized_length(m_properties.horizontal_radius.length(), viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.horizontal_radius.length());
-    if (!m_properties.vertical_radius.is_percentage())
-        absolutized_vertical_radius = absolutized_length(m_properties.vertical_radius.length(), viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.vertical_radius.length());
-    return BorderRadiusStyleValue::create(absolutized_horizontal_radius, absolutized_vertical_radius);
-}
-
 bool CalculatedStyleValue::contains_percentage() const
 {
     return m_expression->contains_percentage();
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValue.h
index 030bd0a61d..3c0709408b 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.h
@@ -267,6 +267,8 @@ private:
 
 using StyleValueVector = Vector<ValueComparingNonnullRefPtr<StyleValue const>>;
 
+Optional<CSS::Length> absolutized_length(CSS::Length const&, CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const&, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height);
+
 class StyleValue : public RefCounted<StyleValue> {
 public:
     virtual ~StyleValue() = default;
@@ -502,39 +504,6 @@ struct StyleValueWithDefaultOperators : public StyleValue {
     }
 };
 
-class BorderRadiusStyleValue final : public StyleValueWithDefaultOperators<BorderRadiusStyleValue> {
-public:
-    static ValueComparingNonnullRefPtr<BorderRadiusStyleValue> create(LengthPercentage const& horizontal_radius, LengthPercentage const& vertical_radius)
-    {
-        return adopt_ref(*new BorderRadiusStyleValue(horizontal_radius, vertical_radius));
-    }
-    virtual ~BorderRadiusStyleValue() override = default;
-
-    LengthPercentage const& horizontal_radius() const { return m_properties.horizontal_radius; }
-    LengthPercentage const& vertical_radius() const { return m_properties.vertical_radius; }
-    bool is_elliptical() const { return m_properties.is_elliptical; }
-
-    virtual ErrorOr<String> to_string() const override;
-
-    bool properties_equal(BorderRadiusStyleValue const& other) const { return m_properties == other.m_properties; }
-
-private:
-    BorderRadiusStyleValue(LengthPercentage const& horizontal_radius, LengthPercentage const& vertical_radius)
-        : StyleValueWithDefaultOperators(Type::BorderRadius)
-        , m_properties { .is_elliptical = horizontal_radius != vertical_radius, .horizontal_radius = horizontal_radius, .vertical_radius = vertical_radius }
-    {
-    }
-
-    virtual ValueComparingNonnullRefPtr<StyleValue const> absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const override;
-
-    struct Properties {
-        bool is_elliptical;
-        LengthPercentage horizontal_radius;
-        LengthPercentage vertical_radius;
-        bool operator==(Properties const&) const = default;
-    } m_properties;
-};
-
 class CalculatedStyleValue : public StyleValue {
 public:
     enum class ResolvedType {
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h
index 9f82881262..504f455a0e 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusShorthandStyleValue.h
@@ -10,6 +10,7 @@
 #pragma once
 
 #include <LibWeb/CSS/StyleValue.h>
+#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
 
 namespace Web::CSS {
 
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusStyleValue.cpp b/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusStyleValue.cpp
new file mode 100644
index 0000000000..51ed3004a0
--- /dev/null
+++ b/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusStyleValue.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
+ * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "BorderRadiusStyleValue.h"
+
+namespace Web::CSS {
+
+ErrorOr<String> BorderRadiusStyleValue::to_string() const
+{
+    if (m_properties.horizontal_radius == m_properties.vertical_radius)
+        return m_properties.horizontal_radius.to_string();
+    return String::formatted("{} / {}", TRY(m_properties.horizontal_radius.to_string()), TRY(m_properties.vertical_radius.to_string()));
+}
+
+ValueComparingNonnullRefPtr<StyleValue const> BorderRadiusStyleValue::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
+{
+    if (m_properties.horizontal_radius.is_percentage() && m_properties.vertical_radius.is_percentage())
+        return *this;
+    auto absolutized_horizontal_radius = m_properties.horizontal_radius;
+    auto absolutized_vertical_radius = m_properties.vertical_radius;
+    if (!m_properties.horizontal_radius.is_percentage())
+        absolutized_horizontal_radius = absolutized_length(m_properties.horizontal_radius.length(), viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.horizontal_radius.length());
+    if (!m_properties.vertical_radius.is_percentage())
+        absolutized_vertical_radius = absolutized_length(m_properties.vertical_radius.length(), viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(m_properties.vertical_radius.length());
+    return BorderRadiusStyleValue::create(absolutized_horizontal_radius, absolutized_vertical_radius);
+}
+
+}
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h
new file mode 100644
index 0000000000..f8474d23df
--- /dev/null
+++ b/Userland/Libraries/LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
+ * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/CSS/Length.h>
+#include <LibWeb/CSS/Percentage.h>
+#include <LibWeb/CSS/StyleValue.h>
+
+namespace Web::CSS {
+
+class BorderRadiusStyleValue final : public StyleValueWithDefaultOperators<BorderRadiusStyleValue> {
+public:
+    static ValueComparingNonnullRefPtr<BorderRadiusStyleValue> create(LengthPercentage const& horizontal_radius, LengthPercentage const& vertical_radius)
+    {
+        return adopt_ref(*new BorderRadiusStyleValue(horizontal_radius, vertical_radius));
+    }
+    virtual ~BorderRadiusStyleValue() override = default;
+
+    LengthPercentage const& horizontal_radius() const { return m_properties.horizontal_radius; }
+    LengthPercentage const& vertical_radius() const { return m_properties.vertical_radius; }
+    bool is_elliptical() const { return m_properties.is_elliptical; }
+
+    virtual ErrorOr<String> to_string() const override;
+
+    bool properties_equal(BorderRadiusStyleValue const& other) const { return m_properties == other.m_properties; }
+
+private:
+    BorderRadiusStyleValue(LengthPercentage const& horizontal_radius, LengthPercentage const& vertical_radius)
+        : StyleValueWithDefaultOperators(Type::BorderRadius)
+        , m_properties { .is_elliptical = horizontal_radius != vertical_radius, .horizontal_radius = horizontal_radius, .vertical_radius = vertical_radius }
+    {
+    }
+
+    virtual ValueComparingNonnullRefPtr<StyleValue const> absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const override;
+
+    struct Properties {
+        bool is_elliptical;
+        LengthPercentage horizontal_radius;
+        LengthPercentage vertical_radius;
+        bool operator==(Properties const&) const = default;
+    } m_properties;
+};
+
+}
diff --git a/Userland/Libraries/LibWeb/Layout/Node.cpp b/Userland/Libraries/LibWeb/Layout/Node.cpp
index 94ef74876a..7fc6b5d781 100644
--- a/Userland/Libraries/LibWeb/Layout/Node.cpp
+++ b/Userland/Libraries/LibWeb/Layout/Node.cpp
@@ -7,6 +7,7 @@
 #include <AK/Demangle.h>
 #include <LibWeb/CSS/StyleValues/BackgroundRepeatStyleValue.h>
 #include <LibWeb/CSS/StyleValues/BackgroundSizeStyleValue.h>
+#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/HTML/BrowsingContext.h>