What is this element called? And what language do I need to program it?

If you go to this website http://ift.tt/sa3q1p you'll get a kind of pop up, but it's not a separate window. It's like an internal window embedded on the actual page, I see this a lot nowadays and want to know how to do it.

Thanks a lot!

Epic visual tool

Epson 5030UB 2D/3D 1080p 3LCD Projector Submitted March 27, 2016 at 07:18AM by frooschnate http://ift.tt/1UUhbQl