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You can throttle (including completely disable) the internet per tab via devtools in most modern browsers...

• jeroenhd 5y ago
  You can, and you can also unplug the ethernet cable, but without any user-friendly, ways that are _actually intended_ to do, so it's easy to get wrong. For example: you enable throttling, upload a picture, that picture gets buffered by a serviceworker, you close the tab, therefore closing the dev tools and disabling the throttling you set up, and the serviceworker uploads whatever you resized to the server anyway. Or: the application just tries to upload stuff whenever you open the page, turning the throttling solution into a race between you and your browser. I don't think using dev tools intended to replicate offline-only behaviour are a good way to actually enforce offline-only behaviour.