A modal is the lightbox viewer with a panel where the picture goes – so the overlay, the close icon, the open animation and the focus trap are the ones already set on Theme Settings, Lightbox. One dialog system, styled in one place.
This is a modal
Escape closes it, the backdrop closes it, and focus is trapped inside while it is open – none of that is written twice, it is the lightbox doing its job.
Size, position and colors are set on the element.
Opened from a link
Small, sitting at the bottom. The same viewer.
Leaving already?
Move the pointer up out of the window and this opens on its own. Once a visit, and never on a touch screen – there is no pointer to leave with.