[css3-images] Does image-resolution apply to CSS images?

<http://dev.w3.org/csswg/css3-images/#image-resolution> says "The ‘image-resolution’ property specifies the intrinsic resolution of all raster images used in or on the element.". "used in or on the element" is confusing.

Does that include CSS images, e.g.

div {
  image-resolution: 300px;
  background-image: url(high-res.tiff);
}

?

Simon