Facebook supports a diverse audience around the world and an equally diverse set of devices. To emphasize that in our design mocks, we redrew a range of devices to show the global diversity of the people using our products. Each device comes with a bitmap of the device (with and without shadows) and the original Sketch file for that device.
LambdaTest is a browser compatibility testing platform that helps in making sure that your websites and web apps runs seamlessly on all browsers. You get on-demand access to a live real machine on which you can perform real-time testing of of your pages. User have a choice of 2000+ different browser and OS environment combinations to run tests on.