Azure Cloud Shell editor: VS Code in web browser

Visual Studio Code is essentially a "SPA" (single page web) application running inside of embedded web browser (Electron, that is based on Chrome web engine).
That editor web application could be used from anywhere, from any web browser, and now it can. 

GitHub - Microsoft/monaco-editor: A browser based code editor

Announcing the Azure Cloud Shell editor in collaboration with Visual Studio Code | Blog | Microsoft Azure

"...to embed Cloud Shell inside of Visual Studio Code and the Azure mobile app team to integrate Cloud Shell into the Azure mobile app for easy access from mobile devices everywhere."

Azure Cloud Shell – Browser-Based Command Line | Microsoft Azure