Polymer

Useful resources

Architecture

webcomponents

Instant Loading Web Apps with An Application Shell Architecture this article describes the application shell

Progressive Web Apps

What is a Service Worker

Promises

PRPL pattern

Service Worker Precache

Service Worker resources

The offline cookbook this is useful when working with Service Worker Precache  to provide the best experience for your users. Service worker lifecycle is explained in the second chapter of the udacity course Offline Web Applications which explains how to use IndexedDB & Service Worker

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