Web performance case study: Wikipedia page previews
Preview popups are common and requires careful scripting and styling; they can generate useful learning about performance as a reference for other front-end tasks.
Author: Noam Rosenthal
How we contributed Paint Timing API to WebKit
The story of how we decided to commission the implementation of Paint Timing API, a feature that lets us observe web performance from an end-user perspective. This web browser feature tells us at what point in time content started to appear on the screen for a visitor.