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Apple used to straight up steal the idea of existing apps. Lately it seems they favor buyout, like with dark cloud becoming weather, but it used to be that Apple would randomly swoop in and crush developers by creating a first party version of their app.
Nbd, but it sounds like you’re talking about encapsulation of event capture (viewport stops receiving events after losing focus).
CORS is a protocol for client-side enforcement of a server-side security policy. It ensures that a resource request (e.g. “my-totally-safe-resource.wasm”) only loads from a location your server permits (e.g. “my-valid-origin.biz”, “friends-valid-origin.org”, etc).