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PWA Challenges
We need a
progressive
web app!
What is a
progressive
web app?
How do we
create a plan
for this?
Do we need a
progressive
web app?
How does the CEO even
know about progressive
web apps?
Cool. I’ve been wanting to play with
service workers… Maybe we can use
Vue.js here as well… I wonder if this
can be used as excuse to switch to
node js…
Progressive Web App Challenges
How does the CEO even
know about progressive
web apps?
Progressive Web App Challenges
Progressive Web App Challenges
Ola Cabs
• 68% increase in mobile traffic
• Tier 2 cities conversion rate same as
native app. Tier 3 cities, conversion
rate is 30% higher with PWA.
• PWA is 200KB which 300x smaller
than Android and 500x than iOS.
• 20% of users who book in the PWA
had previously uninstalled app.
Source: Google, http://bit.ly/2q9D4EA
Source: https://medium.com/dev-channel/a-pinterest-progressive-web-app-performance-case-study-3bd6ed2e6154
Progressive Web App Challenges
What is a
progressive
web app?
Original Definition by Frances Berriman and Alex Russell
Responsive 

Fit any form factor. RWD FTW!
Connectivity Independent

Offline features thanks to service workers.
App-like interactions

App shell for apps navigation.
Fresh

Up-to-date thanks to service workers.
Safe

Served on HTTPS.
Discoverable

Manifest files identify them as apps.
Re-engageable

Push notifications bring people back to apps.
Installable

Can be installed to the home screen w/o app stores.
Linkable

Still part of the web—URLs still work.
Progressive

Use progressive enhancement for better experience.
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
https://docs.google.com/presentation/d/14fBthXt3i3nRbi7vUrVXj3CjI1ILcYlKDAUMf1LXWpY/edit#slide=id.p22
PWA is a website that has been enhanced with:
{manifest}https service worker
Credit to Jeremy Keith for explicitly declaring a technical definition: https://adactio.com/journal/13098
{manifest}https service worker
service worker
Progressive Web App Service Worker
Cache
Network
Explicit control of network requests and cache
Service workers key to performance boon
Source: Google, http://bit.ly/2fpGrRr
Service workers key to performance boon
Source: Google, http://bit.ly/2fpGrRr
Service workers key to performance boon
Source: Google, http://bit.ly/2fpGrRr
Service workers are
also key to
providing an offline
experience and
push notifications
PWA is a website that has been enhanced with:
{manifest}https service worker
But PWAs can be much more…
Progressive web
apps allow us to
build experiences
that previously
required a native
application.
https://www.youtube.com/watch?v=3tb-1MWg44Y
The hype can be a turn off
https://twitter.com/elliotecweb/status/864070806569066497
The name isn’t for you and worrying about it is
distraction from just building things that work better for
everyone. The name is for your boss, for your investor,
for your marketeer.
—Frances Berriman, Naming Progressive Web Apps
Progressive Web App Challenges
Do we need a
progressive
web app?
If so, you would probably benefit from a PWA.
Does your organization have a website?
Does your organization make money on
your website via e-commerce,
advertising, or some other method?
If so, you definitely need a progressive web app.
FUDFear, Uncertainty, Doubt
We already
have a native
app, why do we
need a PWA?
Reach people who don’t have your native app
installed or are on a different device.
Your website is often a
customer’s first interaction
with your company. 

A better web experience will likely mean
more revenue and more native app installs.
The web can’t do
[insert thing here]
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
https://www.flickr.com/photos/ashleyrosex/2861690380
The web can do more
than we think.
But iOS
doesn’t
support
PWAs…
Progressive Web App Challenges
PWAs work
fine on older
browers.
They are
progressive.
AliExpress
• 104% for new users across all
browsers in conversion
• 82% increase in iOS conversion
Source: Google, http://bit.ly/2fq2ckc
Wego
• 50% increase in iOS conversion
• 35% increase in average iOS session
duration
Source: Google, https://bit.ly/2uOsoNM
The Washington Post saw 5x increase in user engagement
Why? Performance. PWA faster even without SW.
PWAs are a trojan horse
for performance.
LET’S DO THIS!
1. Making it feel like an app
2. Installation and Discovery
3. Offline mode
4. Push Notifications
5. Beyond PWAs
1. Making it feel like an app
2. Installation and Discovery
3. Offline mode
4. Push Notifications
5. Beyond PWAs
Making it feel like an app
Progressive Web App Challenges
Like obscenity and brunch, web apps can be
described but not defined.
—Jeremy Keith, By any other name
Make it look
native?
https://material.io/guidelines/platforms/platform-adaptation.html#platform-adaptation-when-to-adapt
Do you switch design language between platforms?
Material Design iOS Design
How many platforms will you adapt to?
What about desktop browsers?
Will you jump every time the platform changes?
Define your own design and be consistent.
Tripcase maintains same design across platforms.
More immersive experience
https://www.flickr.com/photos/taylorherringpr/33138630633/in/album-72157679764685922/
Manifest file display options
display: "standalone" display: "fullscreen"display: "browser" display: “minimal-ui”
We’re spoiled by our browsers
The warm comforts of the browser
navigation bar
status bar
address bar
The warm comforts of the browser
info, refresh,
download
tabs
downloads
find in page
The warm comforts of the browser
sharing
printing
email
Roughing it in app land
Adding a back button is harder than it seems
• Manage the browser history so back
button goes to right location.
• Back button in an app often implies
a hierarchy, not simply going to the
last screen you were on.
• Do you rearchitect your site to
create an app hierarchy?
Progressive Web App Challenges
Where does this button go?
Does it do the same thing as
the browser back button?
Should
there be an
app back
button?
Progressive Web App Challenges
.backButton {
display: none;
}
@media (display-mode: standalone), (display-mode: fullscreen) {
.backButton {
display: block;
}
}
Display mode media query
Not every customer or potential customer will add
your Progressive Web App to their home screen
…but every visitor will “install” your PWA!
Fast, Fluid Experience
Provide Immediate Feedback
Animate Transitions to
Support Wayfinding
Smooth Pages — Avoid Jumps, Use Skeleton Pages
App Shell model of PWAs
App Shell means first paint happens quickly
No PWA, No App Shell, 4G PWA with App Shell, 4G
WARNING: App Shell model often assumes
you’re building a single page application
Progressive Web App Challenges
PWA != SPA
Should feeling like an app be the goal?
Should feeling
like an app be
your goal?
Feel Like an App
Website with
Performance
Improvements
Full screen, app
shell with native
design language
Minimal-ui
Standalone
System Fonts Fullscreen
Animation and Polish App Shell
Native Design
MORE COMPLEXLESS COMPLEX
Offline Mode
Cache for performance and offline fallback
Offline Fallback Pages
Can Keep People
Engaged
• Trivago found that 67% of people
continue to browse the site when they
come back online.
Source: http://bit.ly/2GoXjCi
Many
Hidden
Challenges
DOMException: Quota exceeded.
Progressive Web App Challenges
WHAT? 

THE BROWSER ONLY
DOWNLOADED 15
THUMBNAIL IMAGES!
When 7 KB = 7 MB!
https://stackoverflow.com/questions/39109789/what-limitations-apply-to-opaque-responses
<img src='https://cors.example.com/path/to/image.jpg'
crossorigin=‘anonymous’>
<link rel='stylesheet' href='https://cors.example.com/
path/to/styles.css' crossorigin='anonymous'>
Cache recently viewed content for offline use
Cache recently viewed content for offline use
Highlight Stale Information
Display the Information You Have
Let User’s Choose What They Want Offline
Pre-cache Content and Apps
Give People Trasparency and Control
Offline Interactivity — Background Sync
https://developers.google.com/web/updates/2015/12/background-sync
Offline Interactivity — Or Disallow Editing
Progressive Web App Challenges
Progressive Web App Challenges
The goal isn’t offline; offline is just a special case
of flakiness (and the easiest one to detect
technically). PWAs and SWs give you the ability to
be reliable for your users. That’s the advantage
across all connection states (even online!)
—Alex Russell
Offline
Cache for
Performance
Only
Offline
Interactivity
Offline
Fallback
Offline
Indicator
Cache Recently
Viewed Pages
Disable
Interactivity
Pre-cache
Predetermined Pages
Pre-cache
Dynamic Items
User Choose
What to Cache
MORE COMPLEXLESS COMPLEX
Beyond PWAs
Accelerated Mobile Project
I have some opinions about AMP…
But if you must AMP, then AMP to PWA Install Path
https://developer.washingtonpost.com/pb/blog/post/2016/07/15/amp-up-with-progressive-web-apps/
Auto-login with
Credential
Management API
Payment Request API
Redefining Perceived Performance
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Progressive Web App Challenges
Beyond PWAs
Basic PWA Multiple New APIs
Autofill Support
AMP to PWA
Credential Management API
Camera, other sensors Payment Request API
AMP in PWA
MORE COMPLEXLESS COMPLEX
How do we
create a plan
for this?
PWAs are progressive because… Progressive Roadmap
{manifest}https
Jul 13
Redesign launches
Better security with HTTPS
Faster site via HTTP/2
Better bookmarks via manifest
Oct 3
Faster pages
Offline fallback
It’s a PWA!
service worker
Oct 18
Offline pages
Offline indicator
Improved font loading
Nov 22
Push notifications
HTTP/2 Link Preload
Dec 7
Small tweaks
PWA announced
Progressive Web App Blueprint
Planning &
Definition
Define Your Ideal
Progressive Web App
Offline
Interactivity
Cache for
Perf Only
Offline
Native App
Stores
Website with Perf
Improvements
Full Screen,
App Shell
New APIs
No Add to
Home Screen
Basic PWA
Feels Like An App
Installation and Discovery
No Push
Notifications
Personalized and
Integrated Push
Push Notifications
Beyond PWAs
Benchmark & Plan to Measure
Progressive Web App Blueprint
Planning &
Definition
Technical Debt
(if Necessary)
Baseline
PWA
Front-end
Additions
Larger
Initiatives
Gather team
Brainstorm Ideal PWA
Benchmarks and
measurement plans
Build roadmap
Assess current website
Fix performance issues
Fix usability issues
Manifest
HTTPS
Service worker for
performance
Offline Fallback
Cache recently viewed pages
Precache popular or
important pages
Add third-party push
notification service
CMS plugin for push
notifications
Payment Request API
Credentials Management API
Integrate notifications with
backend systems
Background sync
Move to app shell
Baseline
PWA
Front-end
Additions
Larger
Initiatives
Progressive Web App Blueprint
Planning &
Definition
Technical Debt
(if Necessary)
Gather team
Brainstorm Ideal PWA
Benchmarks and
measurement plans
Build roadmap
Assess current website
Fix performance issues
Fix usability issues
Manifest
HTTPS
Service worker for
performance
Offline Fallback
Cache recently viewed pages
Precache popular or
important pages
Add third-party push
notification service
CMS plugin for push
notifications
Payment Request API
Credentials Management API
Integrate notifications with
backend systems
Background sync
Move to app shell
Every step on
the path to a
PWA makes
sense on its
own.
Progressive Web App Challenges
Coming November 12th!
Preorders available now. Follow
@abookapart, @grigs or sign up for the
A Book Apart newsletter for updates.
https://abookapart.com/products/
progressive-web-apps
No
28
PROGRESSIVE
WEBAPPS
Jason Grigsby
Thank You!
Thank You!
White Blank Notebook by Tirachard Kumtanom
Woman Executive Holding Tablet by Pixabay
Schedule Planning by Startup Stock Photos
Hackers by Christopher Dombres
NSA by by Mario Antonio Pena Zapatería
Map Location Symbol by Tumisa
Smartphone on Bridge by Jeremy Levin
Hype by Kerry J
Instagram App on iPhone by Pixabay
Man in Fuzzy Hat by Gratisography
Southbank - Samsung Galaxy S8 (1) by TaylorHerring
Now THIS is comfort! by Garry Wilmore
Trojan Horse by Hsing Wei
Cold Snow Man Person
Asphalt Blur Car City by Pixabay
Woman Listening to Music by bruce mars
Woman and Dog by Tookapic 
Focus by Mark Hunter
Person Holding Silver iPhone by rawpixel.com
MacBook Air Beside Painting by rawpixel.com
Android Phone by freestocks.org
Smart Watch by Oliur Rahman
Apple Office Internet iPad by Pixabay
Woman Jumping by Quang Anh Ha Nguyen
SEM by Pixabay
Legs on Chair by kaboompics.com
In Hiding by Taylor McBride
Medusa Kill Switch by Scott Hart
White Auto Gauge by Mikes Photos
Blue and Silver Stethoscope by Pixabay
Tortoise by Frans Van Heerden
iPhone Photo on Railroad Tracks by Kaique Rocha
database by ✦ Shmidt Sergey ✦ from the Noun Project
Cloud by Blackwoodmedia.com.au from the Noun Project
Responsive Design by Delwar Hossain from the Noun Project
cogs by Gregor Cresnar from the Noun Project
Special thanks to these fabulous people who graciously
shared their work under Creative Commons.

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