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

running Linux in web browser (and Windows 95, 2000...)

JSLinux

"Run Linux or other Operating Systems in your browser!"

JSLinux - Technical Notes

JSLinux

Virtual x86

while Wnidows 95 image is only 7 MB, running it may take hundreds of MBs

link from:
Embedding Power BI with Peter Myers @ .NET Rocks! vNext