Added 'transform' support

assets/main.rml

@@ -5,5 +5,7 @@
   </head>
   <body>
     <h1>Hello from RmlUi</h1>
+    <div style="position:absolute; top: 0; left: 0; width: 200px; height: 100px; background-color: rgba(255, 0, 0, 128); transform: rotate(15deg) translate(50px,0) scale(0.8)">
+    </div>
   </body>
 </rml>