Info Window for a Drawing Path.  The selected path is highlighted with a yellow selection rectangle. This path is a single line stroked with a shading pattern.  Its buried beneath two other lines as shown by the Overlap level.  Notice also that the line has some transparency.  This value is not shown on the info window because the path is not itself transparent.  The line is part of a transparency group, which is why it's nesting level is 1. It's inside of an XObject which defines the transparency group, and the info window for the containing XObject will display the transparency value.

Info Window for an image.  The selected image is highlighted with a red selection rectangle. The nesting level of 0 indicates that this image is at the top level of page content.