activity_main.xml

<LinearLayout>
    <TextView
        android:id="@+id/tv"
        android:tag="child"
    />
    <Button
        android:tag="child"
    />
</LinearLayout>

CSS for Android.md

Ideas for CSS support in Android

MainActivity.kt

class MainActivity : Activity() {
    
    override fun onCreate(b: Bundle) {
        super.onCreate(b)
        setContentView(R.layout.activity_main)
        
        stylesheet style this 
    }

    val stylesheet = StyleSheet {
        id("tv") { // finds a view by its id
            color =  Color.RED
            fontSize = 12.sp
        }
        
        tag("child") { // finds views by their tag
            color = Color.BLUE
            fontSize = 16.sp
        }
        
        any<TextView> { // finds any views of the specified type (defaults to View)
            color = red
            fontSize = 12.sp
        }
        
        any > tag("children") { // > is an operator overload
            // props
        }
    }
}