Progressive Web Apps TLV

Progressive Web Apps
Tel Aviv
2016
g.co/progressivewebapps

Slack
Join
chromiumdev-slack.herokuapp.com
Login
chromiumdev.slack.com

Proprietary + Confidential
Ido Green
@greenido

Progressive Web Apps
Mobile has natively come to the Web

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML>
<HEAD>
<TITLE>Bach's home page</TITLE>
<STYLE type="text/css">
h1 { color: red }
</STYLE>
</HEAD>
<BODY>
<H1>Bach's home page</H1>
<P>Johann Sebastian Bach was a prolific composer.
</BODY>
</HTML>

Ajax was born to run desktop apps on the Web

How did the Web beat native
applications on the desktop?

Distribution Is The Hardest
Problem In Software
flickr.com/photos/blakespot/

Confidential & Proprietary
● Runs the “desktop Web”
● Pinch and zoom, Pan, etc
● Hitchhikers guide to the galaxy is in
your pocket!
The Mobile Internet came when it brought the Web

Access to the back catalog is great, but you want to
use the new affordances and power

What if the Web evolved those
capabilities, just as it did with
Ajax?

What's Missing?
1. Home Screen Access
2. Push Notifications
3. Offline

1. Home screen Access
Less typing, more tapping.

2. Push Notifications
How can we re-engage users at the right time?

1. Works If Browser Closed
2. Needs Permission

3. Offline That Works™
It isn't an app if it doesn't start when you tap.

example.com
GET /app.html HTTP/1.1
HOST example.com
...
HTTP/1.1 200 OK
Date: Thu, 19 Feb 2015 05:21:56 GMT
...

example.com
// sw.js
onfetch = function(e) {
if(e.request.url == "app.html") {
e.respondWith(
caches.match(e.request)
);
}
if(e.request.url == "content.json") {
// go to the network for updates,
// meanwhile, use cached content
fetch(...).then(function(r) {
r.asJSON().then(function(json) {
e.client.postMessage(json);
});
});
}
};
GET /app.html HTTP/1.1
HOST example.com
...
GET /content.json HTTP/1.1
HOST example.com
...
GET /content.json HTTP/1.1
HOST example.com
...
HTTP/1.1 200 OK
Date: Thu, 19 Feb 2015...
...

Service Workers Are
Network Progressive
Enhancement
A Programmable Network Proxy under your control.

Service Workers are to
Progressive Web Apps as
XMLHttpRequest was to Ajax
The foundational capability that was a tipping point for innovation

Impact of speed on bounce rates
Source: SOASTA; September, 2015
2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6.0 6.3 6.6 6.9 7.2 7.5 7.8 8.1 8.4 8.7 9.0 9.3 9.6 9.9
180,000
140,000
100,000
60,000
0
20,000
58
45
32
19
0
6
Sessions
Load time (in seconds)
Bouncerate(%)
Sessions Bounce rate
13%
bounce
rate
20%
bounce
rate
58%
bounce
rate

RAIL: Instant loading and smooth navigation
● For first visitors, load pages in <10s on 3G
net
○ Aspirational goal: <3s to first paint
● For repeat visitors, loading of page in <500
ms
● Always scrolling at 60 frames/second
● Content shouldn’t jump as images are loaded

● Reliable: Fast loading, offline and on flaky
networks
● Fast: Smooth animation, scrolling and nav
● Engaging and integrated
○ On the home screen, no URL bar, icons,
splash
○ Re-engaging with push notifications
● Consistent experience across browsers
(still in progress, though)
The Progressive Web App Experience

The Progressive Web App - Examples
https://noter-1.firebaseapp.com/https://voice-memos.appspot.com

● Users time on Flipkart lite vs. previous
experience: 3.5 minutes vs 70 seconds.
● 3x more time spent on site
● 40% higher re-engagement rate
● 70% greater conversion rate among those
arriving via Add to Homescreen
● 3x lower data usage
● Read more on Flipkart case study

26%increase in average spend
per visit by members arriving
via a push notification
72%increase in time spent for users
visiting via a push notification
+50%repeat visits within 3 months

Code Time!
1. PWA - g.co/codelabs/pwa
2. Push Notifications - goo.gl/oFwPaV

Source: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis non erat sem

Enter Progressive Web Apps
● Fast loading
● One click away from accessing content
● Smooth animations and navigations
● Re-engages with push notifications
● Good experience on flaky network connections
● Consistent experience across browsers

Enabling app-like capabilities
Service Worker
● Client-side proxy written in JavaScript
● Access device capabilities to allow your
site to be “app like”

Enabling app-like capabilities
Service Worker
● Client-side proxy written in JavaScript
● Access device capabilities to allow your
site to be “app like”
Web App Manifest
● Rich presence on user’s Android
homescreen
● Launch in full-screen mode on Android
● Control the screen orientation
● Define “splash screen” launch, theme
color for site
{ "short_name": "My Cool App",
"name": "My Totally Cool Application",
"icons": [
{"src": "launcher-icon-3x.png",
"sizes": "192x192",
"type": "image/png"}],
"start_url": "index.html",
"display": "standalone",
"background_color" : "#aeaeae",
"theme_color" : "#aeaeae",
"orientation" : "landscape" }

Add to Homescreen & Full Screen
● User who visits 2x in a
within five minutes will
be prompted with
“add to homescreen”
● One tap to add to
homescreen
● Opens full screen - no
URL bar

A few tips before we start...
● Chapters 6 & 7 will take the longest
● Service Workers - Tips
○ Don't forget to change the cacheName
○ Use an incognito window to ensure a fresh start
○ Keep only one tab open at a time
○ chrome://serviceworker-internals & DevTools are your
new best friends
○ Read More tips on Noter PWA Example

Let’s build it!
g.co/codelabs/pwa
Questions?
Ask!

THANK YOU!
Ido Green
@greenido

Misc
Helpful links
● https://www.chromium.org/blink/serviceworker/service-worker-faq
● https://www.chromium.org/blink/serviceworker/getting-started

Let’s do better.

Final thoughts

Progressive Web Apps TLV

Recommandé

Contenu connexe

En vedette

En vedette (20)

Plus de Ido Green

Plus de Ido Green (20)

Progressive Web Apps TLV