Multiple background images
Multiple background images separated by commas may be specified as the value of the background-image property. The images are drawn with the first specified image on top and each subsequent image behind the previous image. All of the other background image-related properties may also be specified as multiple comma-separated values. For those properties, each value in sequence applies to the corresponding ‘background-image’ image. Excess values are ignored. If a property contains fewer comma-separated values than there are background images, then the last specified value is used for the remaining images. If a background-related property is not specified, then the initial value for that property is used for all background images of the formatting object. Multiple background images are available with AH Formatter V6.6 and later.
In the following examples, the dotted border indicates the extent of the content box of the outer block, and the text indicates the -ah-background-clip value. All background images are the same size.
The examples use these images for repeated and non-repeated backgrounds, respectively: 
and 
No other properties
Both images are repeated horizontally and vertically, but the first image obscures the second.
background-repeat: no-repeat, repeat;
Both images are repeated horizontally and vertically, but the first image obscures the second.
background-repeat: no-repeat, repeat;
Both images are repeated horizontally and vertically, but the first image obscures the second.