Google, Apple, and Mozilla are working together to create a better way to test browser speed. Speedometer 3 will be a "cross-industry collaboration" between the developers of Chrome, Safari and Firefox.
The project will follow Speedometer 2 developed by the Apple WebKit team.
Chrome, Safari, and Firefox are three of the four most used browsers today. A fourth browser, Microsoft Edge, does not have its own engine, instead relying on Google's open-source Chromium with Blink and V8 engines.
The Speedometer 3 project is still in its infancy, and its GitHub page warns that that it is "under active development and unstable". The groups recommend using Speedometer 2.1 until development progresses further.