Google announces the release of a web-based tool that can be used by developers to install Android builds on recent Pixel phones and some Android development devices from the web browser. Android Flash Tool comes with support for flashing a new version of Android to these devices: Pixel 2, Pixel 2 XL, Pixel 3 and Pixel 3 XL. Google may collect some account and system info when you use the tool including information on the used web browser, the target and current build, the device model, the model, as well the installation’s progress and errors.
Source: https://www.bleepingcomputer.com/news/google/android-flash-tool-lets-you-install-android-using-a-browser/