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You can cache runtimes with IndexDB, no need to keep downloading them.

But IDB follows the same-origin policy, so you can't share the cached runtime between different apps.

At least not unless you can load it from the same public CDN.

Edit: Actully, I'm not sure you could do that even with the public CDN.

Sure, but you can cache it between invocations of the same app, meaning one can make PWAs with WebAssembly help.