You can build an installable offline app with HTML, CSS and JavaScript. In this video, I'll show you how to easily make your web app a PWA, and how to host it on GitHub pages...right now!
Build an Offline Calculator with HTML, CSS and JavaScript: https://youtu.be/RtgES9srcFg
Link to the hosted app: https://ebenezerdon.github.io/calculator-app
Link to the GitHub repo: https://github.com/ebenezerdon/calculator-app
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