Added some styles

Added mapping StyleId -> ClassName

Ooui.Forms/VisualElementRenderer.cs

@@ -115,6 +115,7 @@ namespace Ooui.Forms
                 }
 
                 element.PropertyChanged += _propertyChangedHandler;
+                ClassName = Element?.StyleId;
             }
 
             OnElementChanged (new ElementChangedEventArgs<TElement> (oldElement, element));
@@ -143,6 +144,9 @@ namespace Ooui.Forms
             else if (e.PropertyName == Layout.IsClippedToBoundsProperty.PropertyName) {
                 //UpdateClipToBounds ();
             }
+            else if (e.PropertyName == "StyleId") {
+                ClassName = Element?.StyleId;
+            }
         }
 
         protected virtual void OnRegisterEffect (PlatformEffect effect)

Ooui/Style.cs

@@ -20,6 +20,10 @@ namespace Ooui
             get => this["align-self"];
             set => this["align-self"] = value;
         }
+        public Value BackfaceVisibility {
+            get => this["backface-visibility"];
+            set => this["backface-visibility"] = value;
+        }
 
         public Value BackgroundColor {
             get => this["background-color"];
@@ -288,6 +292,11 @@ namespace Ooui
             }
         }
 
+        public Value Perspective {
+            get => this["perspective"];
+            set => this["perspective"] = value;
+        }
+
         public Value Position {
             get => this["position"];
             set => this["position"] = value;
@@ -323,6 +332,17 @@ namespace Ooui
             set => this["transform-origin"] = value;
         }
 
+        public Value TransformStyle {
+            get => this["transform-style"];
+            set => this["transform-style"] = value;
+        }
+
+        public Value Transition
+        {
+            get => this["transition"];
+            set => this["transition"] = value;
+        }
+
         public Value VerticalAlign {
             get => this["vertical-align"];
             set => this["vertical-align"] = value;