I might post the repo, but if you don't trust it you can just open the Network inspection tab and you'll see that zero network requests are made when you edit a PDF
You can also use "offline mode" in Dev Tools to ensure that tab doesn't send or receive network traffic. Then you don't have to sit there monitoring it.
You can also use "offline mode" in Dev Tools to ensure that tab doesn't send or receive network traffic. Then you don't have to sit there monitoring it.