diff --git a/Userland/Libraries/LibGUI/UIDimensions.h b/Userland/Libraries/LibGUI/UIDimensions.h
index 97eba9de55b..f1beab0991c 100644
--- a/Userland/Libraries/LibGUI/UIDimensions.h
+++ b/Userland/Libraries/LibGUI/UIDimensions.h
@@ -285,6 +285,13 @@ inline auto clamp<GUI::UIDimension>(GUI::UIDimension const& input, GUI::UIDimens
             return result.has_value();                                        \
         });
 
+#define REGISTER_READONLY_UI_DIMENSION_PROPERTY(property_name, getter) \
+    register_property(                                                 \
+        property_name,                                                 \
+        [this] {                                                       \
+            return this->getter().as_json_value();                     \
+        });
+
 #define REGISTER_UI_SIZE_PROPERTY(property_name, getter, setter)               \
     register_property(                                                         \
         property_name,                                                         \
@@ -309,3 +316,14 @@ inline auto clamp<GUI::UIDimension>(GUI::UIDimension const& input, GUI::UIDimens
             }                                                                  \
             return false;                                                      \
         });
+
+#define REGISTER_READONLY_UI_SIZE_PROPERTY(property_name, getter)     \
+    register_property(                                                \
+        property_name,                                                \
+        [this] {                                                      \
+            auto size = this->getter();                               \
+            JsonObject size_object;                                   \
+            size_object.set("width", size.width().as_json_value());   \
+            size_object.set("height", size.height().as_json_value()); \
+            return size_object;                                       \
+        });
diff --git a/Userland/Libraries/LibGUI/Widget.cpp b/Userland/Libraries/LibGUI/Widget.cpp
index 3c8a8262b34..e605bfca30b 100644
--- a/Userland/Libraries/LibGUI/Widget.cpp
+++ b/Userland/Libraries/LibGUI/Widget.cpp
@@ -50,8 +50,10 @@ Widget::Widget()
     REGISTER_STRING_PROPERTY("tooltip", tooltip, set_tooltip);
 
     REGISTER_UI_SIZE_PROPERTY("min_size", min_size, set_min_size);
+    REGISTER_READONLY_UI_SIZE_PROPERTY("effective_min_size", effective_min_size);
     REGISTER_UI_SIZE_PROPERTY("max_size", max_size, set_max_size);
     REGISTER_UI_SIZE_PROPERTY("preferred_size", preferred_size, set_preferred_size);
+    REGISTER_READONLY_UI_SIZE_PROPERTY("effective_preferred_size", effective_preferred_size);
     REGISTER_INT_PROPERTY("width", width, set_width);
     REGISTER_UI_DIMENSION_PROPERTY("min_width", min_width, set_min_width);
     REGISTER_UI_DIMENSION_PROPERTY("max_width", max_width, set_max_width);