Earlier quoted context omitted.
Right. Well, from what I can see, even the elements on the page and the offline editor works exactly same as your project. Almost everything, even the `npm install` thing is the same. All in all, what you have done is great and absolutely useful for quick tests.
...CodeSandbox has no offline support whatsoever. It sounds like your motivation is to promote an unrelated product in this HN thread, and that's super lame :(
I just tested the offline support of CodeSandbox and I did manage to work with the editor (the same functionality you've mentioned in the blog post) when the network is offline. You can't test it here: https://codesandbox.io/s/new
Again, what you did is absolutely perfect and I don't want or mean to underestimate your work! :)