new Facebook post feature

Hey!

Recently i see a lot of new kind of facebook's posts in my feed which usually are video posts with a play button, like a regular video player, but when you click on the "Play" button, a new window appears which let you watch the video in a player that appears on top of the window and below there is a web view that you can actually scroll down and up, like you surf the web from inside this facebook post.

How do i do that? Does it have a name?
Hope i was clear, Thanks a lot!