Sorry if I'm missing something, but why do you care about supporting other browsers? Isn't VSCode built on Electron which is a self contained server/browser environment?
The article says "It was shipped in the form of the Monaco Editor in various Microsoft projects, including Internet Explorer's F12 tools"; presumably some of those projects also embed it into webpages.
The article says "It was shipped in the form of the Monaco Editor in various Microsoft projects, including Internet Explorer's F12 tools"; presumably some of those projects also embed it into webpages.