SDK build 283 and up
Nodes which are part of CSS styled component (let say default Caspian theme) get user defined values of properties overwritten by CSS template values.

In this example size and type of font is completely ignored
var scene=Scene {
        width: 500
        height: 500
content: [
                        Group {
                                content: [
                                        HBox
                                        {

                                            content: [Button {
                                                    textAlignment: TextAlignment.CENTER
                                                    text: "AAAAAAA"
                                                    font: Font.font("Verdana",38)
                                                    cache: true
                                                    }]

                                         } ]
                                         }
                ]

}

Stage {
    title: "Application title"
    scene:scene;
};