diff --git a/Userland/Libraries/LibWeb/CSS/Percentage.h b/Userland/Libraries/LibWeb/CSS/Percentage.h
index 3ee0a60ef91..3a686f0ee5b 100644
--- a/Userland/Libraries/LibWeb/CSS/Percentage.h
+++ b/Userland/Libraries/LibWeb/CSS/Percentage.h
@@ -43,6 +43,8 @@ private:
     float m_value;
 };
 
+bool calculated_style_value_contains_percentage(CalculatedStyleValue const&);
+
 template<typename T>
 class PercentageOr {
 public:
@@ -80,11 +82,18 @@ public:
 
     bool contains_percentage() const
     {
-        if (is_percentage())
-            return true;
-        if (is_calculated())
-            return calculated()->contains_percentage();
-        return false;
+        return m_value.visit(
+            [&](T const& t) {
+                if (t.is_calculated())
+                    return calculated_style_value_contains_percentage(*t.calculated_style_value());
+                return false;
+            },
+            [&](Percentage const&) {
+                return true;
+            },
+            [&](NonnullRefPtr<CalculatedStyleValue> const& calculated) {
+                return calculated_style_value_contains_percentage(*calculated);
+            });
     }
 
     Percentage const& percentage() const
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
index 31330f3987c..6d37f1d3fb8 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
@@ -2272,4 +2272,9 @@ bool CalculatedStyleValue::CalcValue::contains_percentage() const
         [](auto const&) { return false; });
 }
 
+bool calculated_style_value_contains_percentage(CalculatedStyleValue const& value)
+{
+    return value.contains_percentage();
+}
+
 }