Aspect Ratio
An aspect ratio can be defined by providing the controlling axis relationship and then the actual ratio.
WidthControlsHeight
The width drives the heightHeightControlsWidth
The height drives the widthImageAspect
The aspect ratio is derived from the element'sBackgroundImage
style aspect {
AspectRatio = WidthControlsHeight 2 : 1;
AspectRatio = HeightControlsWidth 4 : 5;
AspectRatio = ImageAspect;
}