As an open and transparent organization, most of our documentation is placed online, able to be viewed and emulated by anyone. Here's a list of the documentation for one of our recently released features.
The history of page previews.
Yesterday, we released a new feature for Wikipedia’s readers on desktop—page previews. Here's a few design nuances behind this feature.
Page previews, deployed today, is one of the largest changes to desktop Wikipedia made in recent years.