diff --git a/gtk/gtkcssstyleproperty.c b/gtk/gtkcssstyleproperty.c
index 1590ed28ae..5f99a1bc68 100644
--- a/gtk/gtkcssstyleproperty.c
+++ b/gtk/gtkcssstyleproperty.c
@@ -39,6 +39,7 @@
 enum {
   PROP_0,
   PROP_ANIMATED,
+  PROP_AFFECTS,
   PROP_AFFECTS_SIZE,
   PROP_AFFECTS_FONT,
   PROP_ID,
@@ -84,6 +85,9 @@ gtk_css_style_property_set_property (GObject      *object,
     case PROP_ANIMATED:
       property->animated = g_value_get_boolean (value);
       break;
+    case PROP_AFFECTS:
+      property->affects = g_value_get_flags (value);
+      break;
     case PROP_AFFECTS_SIZE:
       property->affects_size = g_value_get_boolean (value);
       break;
@@ -116,6 +120,9 @@ gtk_css_style_property_get_property (GObject    *object,
     case PROP_ANIMATED:
       g_value_set_boolean (value, property->animated);
       break;
+    case PROP_AFFECTS:
+      g_value_set_flags (value, property->affects);
+      break;
     case PROP_AFFECTS_SIZE:
       g_value_set_boolean (value, property->affects_size);
       break;
@@ -224,6 +231,14 @@ _gtk_css_style_property_class_init (GtkCssStylePropertyClass *klass)
                                                          P_("Set if the value can be animated"),
                                                          FALSE,
                                                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+  g_object_class_install_property (object_class,
+                                   PROP_AFFECTS,
+                                   g_param_spec_flags ("affects",
+                                                       P_("Affects"),
+                                                       P_("Set if the value affects the sizing of elements"),
+                                                       GTK_TYPE_CSS_AFFECTS,
+                                                       0,
+                                                       G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
   g_object_class_install_property (object_class,
                                    PROP_AFFECTS_SIZE,
                                    g_param_spec_boolean ("affects-size",
@@ -367,6 +382,23 @@ _gtk_css_style_property_is_animated (GtkCssStyleProperty *property)
   return property->animated;
 }
 
+/**
+ * _gtk_css_style_property_get_affects:
+ * @property: the property
+ *
+ * Returns all the things this property affects. See @GtkCssAffects for what
+ * the flags mean.
+ *
+ * Returns: The things this property affects.
+ **/
+GtkCssAffects
+_gtk_css_style_property_get_affects (GtkCssStyleProperty *property)
+{
+  g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), 0);
+
+  return property->affects;
+}
+
 /**
  * _gtk_css_style_property_affects_size:
  * @property: the property
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index 9f6b48192d..d1ce9725cd 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -91,6 +91,7 @@ gtk_css_style_property_register (const char *                   name,
 
   node = g_object_new (GTK_TYPE_CSS_STYLE_PROPERTY,
                        "value-type", value_type,
+                       "affects", affects,
                        "affects-size", (affects & (GTK_CSS_AFFECTS_CLIP | GTK_CSS_AFFECTS_SIZE)) ? TRUE : FALSE,
                        "affects-font", (affects & GTK_CSS_AFFECTS_FONT) ? TRUE : FALSE,
                        "animated", (flags & GTK_STYLE_PROPERTY_ANIMATED) ? TRUE : FALSE,
diff --git a/gtk/gtkcssstylepropertyprivate.h b/gtk/gtkcssstylepropertyprivate.h
index fb851899eb..bd72bc9676 100644
--- a/gtk/gtkcssstylepropertyprivate.h
+++ b/gtk/gtkcssstylepropertyprivate.h
@@ -47,6 +47,7 @@ struct _GtkCssStyleProperty
 
   GtkCssValue *initial_value;
   guint id;
+  GtkCssAffects affects;
   guint inherit :1;
   guint animated :1;
   guint affects_size :1;
@@ -73,6 +74,7 @@ GtkCssStyleProperty *   _gtk_css_style_property_lookup_by_id    (guint
 
 gboolean                _gtk_css_style_property_is_inherit      (GtkCssStyleProperty    *property);
 gboolean                _gtk_css_style_property_is_animated     (GtkCssStyleProperty    *property);
+GtkCssAffects           _gtk_css_style_property_get_affects     (GtkCssStyleProperty    *property);
 gboolean                _gtk_css_style_property_affects_size    (GtkCssStyleProperty    *property);
 gboolean                _gtk_css_style_property_affects_font    (GtkCssStyleProperty    *property);
 guint                   _gtk_css_style_property_get_id          (GtkCssStyleProperty    *property);
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index b586623185..1f96f7d7bb 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -96,7 +96,7 @@ typedef enum /*< skip >*/ {
  *
  * Note that multiple values can be set.
  */
-typedef enum /*< skip >*/ {
+typedef enum {
   GTK_CSS_AFFECTS_FOREGROUND = (1 << 0),
   GTK_CSS_AFFECTS_BACKGROUND = (1 << 1),
   GTK_CSS_AFFECTS_BORDER = (1 << 2),