QRcode image always 'display:none' in some android high versions · Issue #219 · davidshimjs/qrcodejs · GitHub

the Regular Expression (/android ([0-9].[0-9])/i) not working for some android versions. maybe try '/android ([0-9]+(.[0-9])?)/i' ?

QR Code Scanning Animation Using HTML & CSS @NikhilsCode

Wrong aspectRatio displayed on mobile (Android & iOS) · Issue #387 · mebjas/html5-qrcode · GitHub

Doesn't work in Android Chrome but works in desktop Chrome/iOS Safari · Issue #71 · gruhn/vue-qrcode-reader · GitHub

Empty QR Code on multiple new Qrious() · Issue #107 · neocotic/qrious · GitHub

android - Google ML Kit barcode scanner does not scan QR code with green background - Stack Overflow

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30 New Android Libraries released in the Spring of 2017 which deserve your attention

QR code - Turkcewiki.org

Building Multiple QR Codes Scanner Using Swing AVFoundation, by Darwin Harianto

qrcode-scanner · GitHub Topics · GitHub

GitHub - davidshimjs/qrcodejs: Cross-browser QRCode generator for javascript

GitHub - x-hw/amazing-qr: 💮 amazing QRCode generator in Python (supporting animated gif) - Python amazing 二维码生成器（支持 gif 动态图片二维码）

GitHub - jeromeetienne/jquery-qrcode: qrcode generation standalone (doesn't depend on external services)