https://thenextweb.com/dd/2020/05/06/github-codespace-lets-you-code-in-your-browser-without-any-setup/

In a major announcement for developers, GitHub has launched Codespaces — a feature that lets you code directly on the web. Think of this as a virtual Integrated Development Environment (IDE) on the cloud.

Earlier, to contribute to a project you would need to make a pull request, and set up the environment on your local machine according to the requirements of a project. With Codespaces, you don’t need to do that anymore. As soon as you click on the code button, the website sets up the environment in seconds.