The image on the line below should be underlined. It is a link.
The image on the line below should not be underlined. It is a link, but there is no textual content in the inline element that contains the image, so the underline should not be triggered (see the spec). Note -- there should definitely not be any "whiskers" around the image, either!
The image below is formed from a stack of images, they should each be underlined.
The image below is formed from a stack of images, they should not be underlined (for the same reasons as given above).
See also:
Note. This page has an alternate stylesheet called 'Visual
Debugging'. If you select it, it will put a dotted border on
a elements. This will result in a box being placed behind
the images. It is inside these boxes that the underline should
appear. The currently selected stylesheet is: