Progressive Web App

in my points of view

@IO Redux Beijing June 2016

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  <Huxpro zh='黄玄' en='Hux'>
    <Wepiao from="2015" team="Frontend Infrastructure" />
    <Taobao from="2016" team="AliTrip - Mobile Web" />


Progressive Web App?

Progressive Web Apps:

Escaping Tabs Without Losing Our Soul》

First introduced in

1. They progressively become “apps”.

Escaping the Tab: Progressive, Not Hybrid

2. it’s also possible to build this performance in as progressive enhancement.

“Progressive Web Apps”

Is an umbrella term. 


For modern, performant web apps that cleverly take advantage of technologies to provide a top-tier experience on mobile.

“Progressive Web Apps”

Deliver an app-like UX.


Native app store apps do things like send push notifications, work offline, look and feel like an app, load on the homescreen, and so on and so forth.

Mobile Web Apps accessed in a mobile browser, by comparison, historically haven’t done those things. 

1. Installability

Save to home screen/launch in full screen

iOS 1.1.3


Added section on specifying a web clip icon.

iOS 2.1.0


Bookmarked home screen apps open in full screen

  "short_name": "Manifest Sample",
  "name": "Web Application Manifest Sample",
  "icons": [
      "src": "launcher-icon-2x.png",
      "sizes": "96x96",
      "type": "image/png"
  "start_url": "/index.html",
  "display": "standalone",
  "orientation": "landscape"
<link rel="manifest" href="/manifest.json">

2. App Shell

Adopt a Shell + Content application model to create

appy navigations & interactions

  • Progressive Rendering.

  • Not fancy, rather a design approach.

  • Minimal HTML, CSS and JavaScript powering the user interface.

  • With..., the power unleash.

Shell (with mock data )


3. Offline

Work offline or on low quality networks.

Let's kill the dinosaur!


HTTP Caching

no way!

App Cache?

<html manifest="cache.appcache">



  • Web Worker.

  • Programmable proxy.

  • Work with Cache API & Fetch API & IndexedDB API & App Shell...

Intercept and reverse proxy

Alitrip Hybrid Architecture




4. Re-engageable

Make re-engagement easy through features like

push notifications.

  • Service Worker

  • Push API & Notification API

  • Google Cloud Messaging (GCM)

  • Web Push Protocol & HTTP Push

PWA Showcase


The only one PWA in the web "sentence" of keynote

Not only polymer.

We translate videos, I/O and beyond.

PWA Cons. 

In my POV.

  • High Entry Bar

    • HTTPS & HTTP/2

    • low-level nature of the service worker APIs

  • Browsers support

  • User habits

PWA Pros. 

In my POV.

  • New modern capabilities

  • High entry bar can build trust

  • Progressive Enhancement & Graceful Degradation

  • Web Standard

WHY Web?

or why not give up web?



Dicoverable, Linkable, Low Friction, Broad Reach...