It's using both of them are using iFrames to proxy the messages and you see a lot of network requests go from your local server to. either to stack Blitz or to code sandbox. I all of a sudden I was like oh like is this actually running on my computer or is this going to their servers? So yeah what's the call of them said those network requests are for proxying npm which makes sense because you don't have node install in your browser as well so if you need dependencies they will proxy them through actually web containers uses turbo which is is really cool.

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