diff --git a/Userland/Libraries/LibWeb/CSS/Length.cpp b/Userland/Libraries/LibWeb/CSS/Length.cpp
index 09503162c0..8c1694f1cc 100644
--- a/Userland/Libraries/LibWeb/CSS/Length.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Length.cpp
@@ -93,6 +93,9 @@ float Length::relative_length_to_px(Gfx::IntRect const& viewport_rect, Gfx::Font
 
 float Length::to_px(Layout::Node const& layout_node) const
 {
+    if (is_calculated())
+        return m_calculated_style->resolve_length(layout_node)->to_px(layout_node);
+
     if (!layout_node.document().browsing_context())
         return 0;
     auto viewport_rect = layout_node.document().browsing_context()->viewport_rect();
diff --git a/Userland/Libraries/LibWeb/CSS/Length.h b/Userland/Libraries/LibWeb/CSS/Length.h
index cbfd43d34f..60494aca0b 100644
--- a/Userland/Libraries/LibWeb/CSS/Length.h
+++ b/Userland/Libraries/LibWeb/CSS/Length.h
@@ -86,6 +86,8 @@ public:
             return 0;
         if (is_relative())
             return relative_length_to_px(viewport_rect, font_metrics, root_font_size);
+        if (is_calculated())
+            VERIFY_NOT_REACHED(); // We can't resolve a calculated length from here. :^(
         return absolute_length_to_px();
     }