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There's no reason you can't have multiple "apps" running at the same time, you just don't have preemption ( https://en.wikipedia.org/wiki/Preemption_(computing)

There's no reason you can't have multiple "apps" running at the same time, you just don't have preemption ( https://en.wikipedia.org/wiki/Preemption_(computing) https://en.wikipedia.org/wiki/Preemption_(computing) ) so it's possible for one application to tie up the CPU indefinitely. That's definitely not whats happening in this case, since the UI is still responsive. Alternatively, to get true isolation and preemptive multitasking you could have a sort of "window server" that sends UI events to Web Workers and received drawing commands of some kind (a React virtual DOM?)

spankalee 11y ago
You don't need web workers, you just need to host each app in a sandboxed iframe. Then it can render however it wants with normal DOM access and have script and DOM isolation from the OS and other apps. You would need some sort of IPC system on top of postMessage, and probably some way to send theme data down into the frame and get things like content sizes back out. I don't think same-origin iframed apps would be out-of-process in Chrome yet, but I do think Chrome is supposed to get out-of-process frames eventually. That would prevent an apps from exploiting a browser bug to take down the whole tab.