AFAIK it’s a PvE game that utilizes the same mechanics as the battle royale game, but otherwise is mostly separate. I think if you purchase it you get a bunch of XP for Fortnite BR by playing it each season though

https://www.fortnite.com/save-the-world

Woah, TIL

http://shouldiprefix.com/#filters

Isn’t -webkit-filter still required?

The language is CSS, the dot signifies that it’s the name of a class. So any HTML elements with the same class name will have those CSS styles applied to them