A browser QR scanner without BarcodeDetector or a CDN
An in-page QR scanner sounds like a thin wrapper around a camera API. The first version often is: request a camera, hand frames to BarcodeDetector, and continue when it returns a QR value. That design has an awkward failure mode. The camera can work perfectly while QR detection is unavailable. A browser may expose getUserMedia() but not BarcodeDetector, so capability detection turns into a message telling the user to leave the app and find another scanner.
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