Lightbox
Also called: Photo viewer, Media viewer
A full-screen viewer that opens a photo from a thumbnail on top of the page.
Definition
Lightboxes need swipe and arrow-key navigation, zoom, a counter, and a way to close that returns the user to the same thumbnail. Focus must stay inside while it's open.
In practice
Tapping the third listing photo opens it full screen, showing '3 of 12', and closing it returns to the same spot in the grid.