I have a Firebase-hosted Progressive Web App that uses the device camera for real-time barcode scanning. Everything is smooth on Android, yet every iPhone I test—whether the user installs the PWA or runs it in Safari or Chrome—throws the message: “Barcode Scanner Not Supported Your browser does not support the barcode detection feature. Please use a modern browser like Chrome or Safari.” Ironically, this appears even inside Safari, so the issue is clearly an iOS compatibility gap rather than a true browser limitation. I need a JavaScript/iOS-savvy developer to: • Diagnose why the camera or BarcodeDetector API fails on iOS and implement a reliable fallback that works on current iPhone models (iOS 15+). Whether it’s a polyfill, WebAssembly-based library, or a tweak to how getUserMedia and constraints are requested is up to you—so long as the user experience remains as seamless as it is on Android. • Audit the rest of the PWA for minor glitches that might surface only on iOS (e.g., permissions prompts, viewport quirks, service-worker–related caching). • Deliver code changes with clear comments plus a short changelog so I can track what was modified. The core stack is vanilla JavaScript with HTML5 and Firebase hosting; no native wrapper is involved. If you need to bring in libraries such as ZXing, QuaggaJS, or Dynamsoft as a fallback, that’s acceptable provided they stay lightweight and work offline once cached. I’ll consider the task complete when: 1. Scanning UPC, QR, and Code 128 barcodes on an iPhone succeeds in my test build. 2. No “Barcode Scanner Not Supported” alert surfaces on supported devices. 3. No new regressions appear on Android. Tell me how you plan to approach the iOS camera constraints and any similar fixes you’ve shipped before, and we can get started right away.