It’s a website http://uitestingplayground.com for test engineers to sharpen test automation skills and better learn capabilities of test automation tools. It is free to use and contribute. Find sources on GitHub: r/https://github.com/inflectra/ui-test-automation-playground
The list of cases to explore is not complete yet and we plan to add Multi Frame (including CORS), Text Verification, Menu and other examples. If you find it useful – let us know!
Here is a blog post with ideas behind the project