Comment by cbxyp

Used this a few years ago in early stages before VS code remote was a thing. It's very useful to add some interface extensibility components into VS Code's framework. I suspect microsoft made some intentional design decision to make this harder to do in VS code's apis, totally eschewing any real editor extensibility in favor of a "apps in the editor, not extending the editor" design vs Atom's much more open ended allowance for modifications. For example, if you wanted to make a form builder in VS code for VS code extensions - that would not be usable outside of the Webview tab functionality without modifying the editor source. Glad eclipse foundation recognized this and is providing some groundwork to make a real IDE out of VS code. Theia was also the first to provide support for running vscode-as-a-platform and run via web browser, at least support that was functional and working.