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Progressive Web Apps
Igor Chiriac
“A Progressive Web App uses
modern web capabilities to deliver an
app-like user experience.”
* https://thishereweb.com/understanding-the-manifest-for-web-app-3f6cd2b853d6
Why the need of PWA ?
“Mobile users spend 80% of the time

on their devices using only their top three apps”
A research conducted in 2015 by marketingland.com shows that:
App Install Friction
Google Mobile First
https://whatwebcando.today/
Introduction of PWA
Reliable
Load instantly and never
show the downasaur, even
in uncertain network
conditions.
>< nextprevious
Fast
Respond quickly to user
interactions with silky
smooth animations and no
janky scrolling.
Engaging
Feel like a natural app on
the device, with an
immersive user
experience.
Web Manifest
‣ allows app to be launched in full-screen mode
‣ control over screen orientation
‣ define the Splash Screen
‣ define icons and theme colors
Manifest File
Service Workers
Service Worker Support
PWA Optimization
PRPL Pattern
‣ Push critical resources for the initial URL route
‣ Render initial route.
‣ Pre-cache remaining routes.
‣ Lazy-load and create remaining routes on demand.
PRPL Pattern
RAIL - performance model
Application shell architecture
Lighthouse - Google Chrome Extension
Lighthouse Optimization Report
Study Cases
Twitter
‣ 65% increase in pages per session
‣ 75% increase in Tweets sent
‣ 20% decrease in bounce rate
Alibaba
‣ 76% higher conversions across browsers
‣ 14% more monthly active users on iOS; 30% on Android
‣ 4X higher interaction rate from Add to Homescreen
Moldova Guide PWA
‣ Build with Ember.js
‣ Deployed on Firebase
Thank you :)

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