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Re:Why I Actively Discourage Online Tooling like jwt.io and ... by pinteresting on Wednesday September 02, 2020 @09:09AM (#24352826)
If you could sandbox part of the screen to say this thing is standalone and cannot perform any networking abilities and is cut off from everything else on the page that would be great.

The browser could recognise that tag and you get a safe space for people to copy/paste/interact with online web tools.

I'm pretty sure you can do this with WASM right now, but the browser doesn't inform the user that this is a safe space.

Re:Why I Actively Discourage Online Tooling like jwt.io and ... by hundchenkatze on Wednesday September 02, 2020 @11:33AM (#24354209)
It's not exactly what you're describing and may be overkill, but you can definitely accomplish this with Qubes OS.

https://www.qubes-os.org/intro/