Make your Polymer web app Progressive

Make your Polymer web-app Progressive Oleh Zasadnyy @ozasadnyy

Source (November 2016): https://goo.gl/XmjFRq

10% 90% Mobile web Apps Source (April 2016): https://goo.gl/paQFV Mobile
usage

Mobile web Apps Monthly unique visitors (MM) 8.9 3.3 Source
(June 2015): https://goo.gl/nArG5B 2.5x

53% of visits are abandoned if a mobile site takes
more than 3 seconds to load Source (September 2016): https://goo.gl/a3g4J5 1 out of 2 people expect a page to load in less than 2 seconds

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1 Waiting in line at retail store Watching a melodramatic TV show Standing at the edge of a virtual cliff Watching a horror movie Experiencing mobile delays Solving a math problem Source (2015): https://goo.gl/8v7bRG The level of stress caused by mobile delays was comparable to watching a horror movie Cognitive load associated with stressful situations

77% of mobile sites take longer than 10 seconds to
load on 3G networks Source (September 2016): https://goo.gl/a3g4J5 19 seconds is the average load time for mobile sites on 3G networks

1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 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 0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 3.9 Load time (seconds) Sessions Sessions Conversation rate Source (September 2015): https://goo.gl/qEcjDu 1.9% 1.5% 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.7 Conversion rate (%) 0.98% 1.9x Conversion rate

Source (September 2015): https://goo.gl/qEcjDu 1.2 1.5 1.8 2.1 2.4 2.7
3.0 3.3 3.6 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 0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 3.9 Load time (seconds) Sessions Sessions Bounce rate 56% 12.8% 0 6 13 19 26 32 39 45 51 58 Bounce rate (%) 20% Bounce rate

Instant Loading Add to Home Screen Push Notiﬁcations Fast Secure
Responsive

Instant loading

P R P L

Push critical resources for the initial URL route Render initial
route Pre-cache remaining routes Lazy-load and create remaining routes on demand

HTTP/2 Server Push

App shell Content

<app-drawer-layout fullbleed>  <app-drawer>  <app-toolbar>Menu</app-toolbar>  <iron-selector selected="[[page]]">  <a name="view1" href="/view1">View One</a> 
...  </iron-selector>  </app-drawer>    <app-header-layout>  ...  </app-header-layout>  </app-drawer-layout>

<iron-pages selected="[[page]]" attr-for-selected="name">  <my-view1 name="view1"></my-view1>  <my-view2 name="view2"></my-view2>  <my-view3 name="view3"></my-view3>  <my-view404
name="view404"></my-view404>  </iron-pages>

Polymer({  is: ‘my-app',   properties: {  page: {  type: String, 
observer: '_pageChanged'  }  },   _pageChanged: function (page) {  var resolvedPageUrl = this.resolveUrl('my-' + page + '.html');  this.importHref(resolvedPageUrl, null, this._showPage404, true);  },   _showPage404: function () {  this.page = 'view404';  }  });

Amsterdam, NL - Go Daddy - Chrome - 3G First
View (3.7s) Repeat View (0.6s)

if ('serviceWorker' in navigator) {  navigator.serviceWorker.register('/service-worker.js')  .then(function (reg) {  console.log('Service
Worker Registered', reg);  })  .catch(function (err) {  console.log('Error registering Service Worker', err);  });  } Register Service Worker

self.addEventListener('activate', function (e) {  e.waitUntil(  caches.keys().then(function (keyList) {  return Promise.all(keyList.map(function
(key) {  if (key !== cacheName) {  return caches.delete(key);  }  }));  }));  return self.clients.claim();  }); Remove Outdated Resources

self.addEventListener('fetch', function (e) {  e.respondWith(  caches.match(e.request).then(function (response) {  return response
|| fetch(e.request);  })  );  }); Return Resources from Cache

<platinum-sw-*></platinum-sw-*>

<platinum-sw-register  skip-waiting  clients-claim  auto-register  state="{{state}}"  on-service-worker-error="handleSWError"  on-service-worker-updated="handleSWUpdated"  on-service-worker-installed="handleSWInstalled"  >  <platinum-sw-*>
children which share the service worker registration...  </platinum-sw-register>

<platinum-sw-register  skip-waiting  clients-claim  reload-on-install  state="{{state}}"  >  <platinum-sw-cache  default-cache-strategy="networkFirst"  precache="{{precacheList}}"  ></platinum-sw-cache> 
</platinum-sw-register>

<platinum-sw-register auto-register>  <platinum-sw-import-script  href=“custom-fetch-handler.js" ></platinum-sw-import-script>   <platinum-sw-fetch  handler="customFetchHandler"  * path="/(.*)/customFetch" 
></platinum-sw-fetch>  </platinum-sw-register>

{  "entrypoint": "index.html",  "shell": "src/my-app.html",  "fragments": [  "src/my-view1.html",  "src/my-view2.html",  "src/my-view3.html", 
"src/my-view404.html"  ],  "sourceGlobs": [  "src/**/*",  "images/**/*",  "bower.json"  ],  "includeDependencies": [  "manifest.json",  "bower_components/webcomponentsjs/webcomponents-lite.min.js"  ]  }

Chrome Desktop and Mobile (version 40+) Firefox Desktop and Mobile
(version 44+) Opera on Mobile (version 27+)

Browser quota limits Chrome - 6% of free disk space
per origin Firefox - 10% of free disk space (shared across eTLD+1) Safari - at least 10% of free disk space Edge - <8GB: 10MB 8GB-32GB: 50MB 32GB-128GB: 250MB >128GB: 500MB

Add to Home Screen

<html lang="en">  <head>  <meta charset="utf-8">  <title>GDG DevFest Ukraine 2016</title>  <link
rel="manifest" href=“manifest.json"> ...

{  "name": “GDG DevFest Ukraine 2016",  "short_name": “GDG DevFest",  "icons":
[{  "src": "images/icons/splash-icon-128.png",  "sizes": "128x128",  "type": "image/png"  },{  "src": "images/icons/splash-icon-192.png",  "sizes": "192x192",  "type": "image/png"  },{  "src": "images/icons/splash-icon-384.png",  "sizes": "384x384",  "type": "image/png"  }],  "start_url": "/",  "display": "standalone",  "background_color": "#607d8b",  "theme_color": "#607d8b"  }

{  "name": “GDG DevFest Ukraine 2016",  "short_name": “GDG DevFest",  "icons":
[{  "src": "images/icons/splash-icon-128.png",  "sizes": "128x128",  "type": "image/png"  },{  "src": "images/icons/splash-icon-192.png",  "sizes": "192x192",  "type": "image/png"  },{  "src": "images/icons/splash-icon-384.png",  "sizes": "384x384",  "type": "image/png"  }],  "start_url": "/",  "display": "browser",  "background_color": "#607d8b",  "theme_color": "#607d8b"  }

Chrome Desktop and Mobile (version 38+) Opera on Mobile (version
32+)

Push Notiﬁcations

Timely Precise Relevant

{  "body": "Did you make a $1,000,000 purchase at Dr.
Evil...",  "icon": "images/ccard.png",  "vibrate": [200, 100, 200, 100, 200, 100, 400],  "tag": "request",  "actions": [  { "action": "yes", "title": "Yes", "icon": "images/yes.png" },  { "action": "no", "title": "No", "icon": "images/no.png" }  ]  }

Check if User is Subscribed Ask User To Subscribe User
Subscribes Send Subscription Save Subscription Browser Server Subscribing Users

Sending Messages Generate Message Send to End Point Send to
Browser Received by Browser Server Browser End Point

Receiving Messages Push Arrives SW Starts Handle Message Show Notiﬁcation
Browser

if ('serviceWorker' in navigator) {  navigator.serviceWorker.register('/service-worker.js')  .then(function (reg) {  reg.pushManager.getSubscription() 
.then(function (sub) {  console.log('Subscription Info', sub);  });  });  } else {  console.log('Subscription Info', 'Not Supported');  } Check for Subscriptions

JSONiﬁed Subscription Object {  "endpoint": "https://example.com/push/ddj4Sk3abw:A49b...",  "keys": {  "auth": "qLAYRzG9TnUwbprns6H2Ew==", 
"p256dh": "BILXd-c1-zuEQYXH_tc3qmLcqZclw7-Xs0Nlu/sG..."  }  }

navigator.serviceWorker.getRegistration().then(function (reg) {  reg.pushManager.getSubscription().then(function (sub) {  if (sub) {  sub.unsubscribe(); 
console.log('Update our server to remove subscription');  }  });  }).catch(function (error) {  console.log('Error while trying to unsubscribe', error);  }); Unsubscribe the User

self.addEventListener('push', function (event) {  var data;  if (event.data) {  data
= event.data.json();  } else {   // fetch data from server   }  self.registration.showNotification(data.title, {  body: data.body, icon: data.icon, tag: data.tag  });  }); Listen For Messages

self.registration.showNotification(data.title, {  body: data.body,  icon: data.icons,  tag: data.tag,  actions: [ 
{action: 'like', title: 'Like', icon: ic_li},  {action: 'reshare', title: 'Reshare', icon: ic_re}  ]  }); Add Action Buttons

Respond To The User self.addEventListener('notificationclick', function (event) {  if (event.action
=== 'like') {  event.waitUntil(fetch('/like-from-notification'));  } else if (event.action === 'reshare') {  event.waitUntil(fetch('/reshare-from-notification'));  } else {  clients.openWindow(event.srcElement.location.origin);  }  });

<platinum-push-messaging></platinum-push-messaging>

<platinum-push-messaging id="messaging"  title="Application updated"  message="The application was updated in the
background"  icon-url="icon.png"  click-url="notification.html"  ></platinum-push-messaging>

<platinum-push-messaging id="messaging"  message-url="notification-data.json"  ></platinum-push-messaging>

<platinum-push-messaging id="messaging"></platinum-push-messaging>

requestPermission: function () {  this.$.messaging.enable()  .then(function () {  // permission
was granted  }, function (err) {  // permission was denied  });  } Subscribe the User

listeners: {  'platinum-push-messaging-push': 'handleMessage'  } handleMessage: function (message) {  //
handle received message  } Listen for Messages

<firebase-*></firebase-*>

<firebase-app  name="dfua"  auth-domain="dfua.firebaseapp.com"  database-url="https://dfua.firebaseio.com"  api-key="AIzaSyBu9LI-hY4NfULOOOLuV3BfQm7edLr2-aE"  messaging-sender-id="1083195713896"  ></firebase-app>

<firebase-messaging  id="messaging"  token="{{token}}"  on-message="handleMessage"  ></firebase-messaging>

<firebase-messaging   token="{{token}}"  ></firebase-messaging>   <firebase-document   path="/users/[[user.uid]]/token"   value="[[token]]" 
></firebase-document>

requestPermission: function () {  this.$.messaging.requestPermission()  .then(function () {  // permission
was granted  }, function (err) {  // permission was denied  });  } Subscribe the User

handleMessage: function (message) {  // handle received message  } Listen
For Messages

Chrome Desktop and Mobile (version 50+) Firefox Desktop and Mobile
(version 44+) Opera on Mobile (version 37+)

60fps 1 SECOND / 60 = 16.66MS PER FRAME

JavaScript Style Layout Paint Composite

Live: https://csstriggers.com

Stick to transform and opacity changes for your animations Promote
moving elements with will-change or translateZ Avoid overusing promotion rules; layers require memory and management

transform: translate(npx, npx);  transform: scale(n);  transform: rotate(neg);  transform: skrew(X|Y)(ndeg);  transform:
matrix(3d)(...);  opacity: 0...1;

.moving-element {  will-change: transform;  transform: translateZ(0); /* For old browsers
*/  }

* {  will-change: transform;  transform: translateZ(0); /* For old browsers
*/  }

Avoid setTimeout or setInterval for visual updates; always use requestAnimationFrame
instead Move long-running JavaScript off the main thread to Web Workers Use micro-tasks to make DOM changes over several frames Use Chrome DevTools’ Timeline and JavaScript Proﬁler to assess the impact of JavaScript

16ms 16ms JavaScript RS Composite SetTimeout ﬁres

var dataSortWorker = new Worker("sort-worker.js");  dataSortWorker.postMesssage(dataToSort);    // The main
thread is now free to continue working on other things...    dataSortWorker.addEventListener('message', function (evt) {  var sortedData = evt.data;  // Update data on screen...  });

var taskList = breakBigTaskIntoMicroTasks(monsterTaskList);  requestAnimationFrame(processTaskList);    function processTaskList(taskStartTime) {  var
taskFinishTime;  do {  var nextTask = taskList.pop(); // Assume the next task is pushed onto a stack.    processTask(nextTask); // Process nextTask.    // Go again if there’s enough time to do the next task.  taskFinishTime = window.performance.now();  } while (taskFinishTime - taskStartTime < 3);    if (taskList.length > 0)  requestAnimationFrame(processTaskList);  }

<iron-media-query  query="(max-width:768px)"  query-matches="{{app.isPhoneSize}}"  ></iron-media-query> <template is="dom-if" if="[[app.isPhoneSize]]">  <drawer-block  app={{app}}  drawer 
></drawer-block>  </template>

Polymer.RenderStatus.afterNextRender(this, function () {  // Time consuming operation  });

Secure

Secure Trust Data integrity User privacy

HTTP attackers sensitive data

HTTP Best deal! Only today. inject advertisement

Responsive

<iron-flex-layout></iron-flex-layout>

Project page: https://github.com/Polymer/polymer-cli

Project page: https://github.com/PolymerLabs/polydev

Live: http://www.webpagetest.org

Project page: https://github.com/GoogleChrome/lighthouse

Showcase

Live: https://www.net-a-porter.com

Live: https://events.google.com/io2016

Live: https://devfest.gdg.org.ua

3.5 minutes vs 1.1 minutes 40% higher re-engagement rate 70%
greater conversion rate among those arriving via Add to Home Screen 3x lower data usage Live: https://www.flipkart.com

104% for new users across all browsers 82% increase in
iOS conversion rate 2X more pages visited per session 74% increase in time spent per session across all browsers Live: https://aliexpress.com

23% increase in mobile search users who return within 7
days 88% improvement in load time for AMP content versus traditional mobile web 1000+ articles The Washington Post publishes in AMP HTML daily Live: https://www.washingtonpost.com

Let’s create a better web together

Questions? Oleh Zasadnyy @ozasadnyy

Make your Polymer web app Progressive

Make your Polymer web app Progressive

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