The June 2021 update to Visual Studio Code (v1.58) improves the Workspace Trust feature introduced in the previous monthly update, while boosting Jupyter functionality and allowing terminals in the ...

This means Visual Studio Online will also support all the extensions that are currently available for Visual Studio Code, as well as popular features like Visual Studio Code workspaces.

Believe it or not you can use Microsoft's Visual Studio Code from your web browser, or at least, versions of it.