diff --git a/Libraries/LibWeb/CSS/Serialize.cpp b/Libraries/LibWeb/CSS/Serialize.cpp
index 165730de2e1..fddc2dcc68b 100644
--- a/Libraries/LibWeb/CSS/Serialize.cpp
+++ b/Libraries/LibWeb/CSS/Serialize.cpp
@@ -1,11 +1,12 @@
 /*
- * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include <AK/StringBuilder.h>
 #include <AK/Utf8View.h>
+#include <LibWeb/CSS/Parser/ComponentValue.h>
 #include <LibWeb/CSS/Serialize.h>
 
 namespace Web::CSS {
@@ -241,4 +242,13 @@ String serialize_a_css_declaration(StringView property, StringView value, Import
     return MUST(builder.to_string());
 }
 
+// https://drafts.csswg.org/css-syntax/#serialization
+String serialize_a_series_of_component_values(ReadonlySpan<Parser::ComponentValue> component_values, InsertWhitespace insert_whitespace)
+{
+    // FIXME: There are special rules here where we should insert a comment between certain tokens. Do that!
+    if (insert_whitespace == InsertWhitespace::Yes)
+        return MUST(String::join(' ', component_values));
+    return MUST(String::join(""sv, component_values));
+}
+
 }
diff --git a/Libraries/LibWeb/CSS/Serialize.h b/Libraries/LibWeb/CSS/Serialize.h
index 03c206ef893..ec8050686a8 100644
--- a/Libraries/LibWeb/CSS/Serialize.h
+++ b/Libraries/LibWeb/CSS/Serialize.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -46,4 +46,11 @@ void serialize_a_comma_separated_list(StringBuilder& builder, Vector<T> const& i
 
 String serialize_a_css_declaration(StringView property, StringView value, Important = Important::No);
 
+enum class InsertWhitespace : u8 {
+    No,
+    Yes,
+};
+// FIXME: Remove InsertWhitespace param once style value parsing stops discarding whitespace tokens.
+String serialize_a_series_of_component_values(ReadonlySpan<Parser::ComponentValue>, InsertWhitespace = InsertWhitespace::No);
+
 }
diff --git a/Libraries/LibWeb/CSS/StyleValues/UnresolvedStyleValue.cpp b/Libraries/LibWeb/CSS/StyleValues/UnresolvedStyleValue.cpp
index aee35f548e2..062cc6e3d61 100644
--- a/Libraries/LibWeb/CSS/StyleValues/UnresolvedStyleValue.cpp
+++ b/Libraries/LibWeb/CSS/StyleValues/UnresolvedStyleValue.cpp
@@ -7,8 +7,9 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include "UnresolvedStyleValue.h"
 #include <AK/StringBuilder.h>
+#include <LibWeb/CSS/Serialize.h>
+#include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
 
 namespace Web::CSS {
 
@@ -17,7 +18,7 @@ String UnresolvedStyleValue::to_string(SerializationMode) const
     if (m_original_source_text.has_value())
         return *m_original_source_text;
 
-    return MUST(String::join(' ', m_values));
+    return serialize_a_series_of_component_values(m_values, InsertWhitespace::Yes);
 }
 
 bool UnresolvedStyleValue::equals(CSSStyleValue const& other) const