Test images

img local PNG (relative)

img local PNG (relative to root)

img PNG (remote, ignored)

img SVG (relative)

CSS background-image (relative)

CSS background-image (relative to root)

CSS background-image (remote, ignored)

img data-uri (ignored)

CSS background-image data-uri (ignored)

CSS background stacked (local and remote, remote ignored)

img srcset

blank image src (not included)

empty background-image url (uses current page url, should not be included)

Duplicates of some of the above images, to verify they are not duplicated in resources: