Priests no longer read the Puja mantras from books. Now they are using their laptops or smartphones for this purpose.
Check this video where a priest is reading Durga Puja mantra from his laptop screen. The slokas are stored in a PDF file.
This video was telecasted on OTV News Fuse 30 October 2015 episode. And the scene was recorded from a Durga Puja mandap in Bhubaneswar.
You may call it modern day puja or hi-tech puja.