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@onishiweb Best viewed with… Adam Onishi State of the Browser - September 2015

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@onishiweb A long time ago…

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@onishiweb @onishiweb

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@onishiweb

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@onishiweb “Browser wars!”

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@onishiweb @onishiweb

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@onishiweb – a website in 2015 “For best results view this page in Chrome.”

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@onishiweb Chrome Firefox IE Safari Opera UC Browser Safari (iOS) Opera Mini Android Browser Amazon Silk YaBrowser Maxthon Iron Nokia Browser Sea Monkey Avant Camino Epiphany OmniWeb Konqueror Galeon Swiftfox Edge

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@onishiweb Chrome (v44) - Cache.add() - Request.context() - Notiﬁcation.data Edge - img srcset - CSS Regions - Arrow functions Firefox (v40) - Improved Dev tools - IndexedDB transactions - Fetch API (v39) Safari (v9) - Backdrop ﬁlters - CSS scroll snapping - Content blocking

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@onishiweb

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@onishiweb A moratorium http://www.quirksmode.org/blog/archives/2015/07/stop_pushing_th.html

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@onishiweb Developer-ﬁrst development

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@onishiweb Cake or Death?

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@onishiweb Progressive enhancement

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@onishiweb “Vague, but exciting”

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@onishiweb Photo by Simon Collison - https://flic.kr/p/pbRdFm @onishiweb

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@onishiweb Photo by Pedro Ribeiro Simões - https://flic.kr/p/bvCA8 @onishiweb

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@onishiweb – Paul Robert Lloyd “By making fewer assumptions about context and interface, focusing more on users’ tasks and goals, we can create more adaptable products.” http://alistapart.com/article/thinking-responsively-a- framework-for-future-learning

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@onishiweb @onishiweb

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@onishiweb Control

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@onishiweb Defensive design

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@onishiweb What we do know

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@onishiweb Baseline

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@onishiweb Performance

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@onishiweb Perceived Performance

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@onishiweb

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@onishiweb

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@onishiweb Progressively enhanced performance

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@onishiweb Render blocking assets

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@onishiweb CSS, JS, & Fonts

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@onishiweb CSS

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@onishiweb CSS is still an enhancement

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@onishiweb CSS as an enhancement

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@onishiweb Critical Path CSS

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@onishiweb Tooling

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@onishiweb https://github.com/addyosmani/critical

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@onishiweb https://github.com/pocketjoso/penthouse

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@onishiweb loadCSS https://github.com/filamentgroup/loadCSS/

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@onishiweb Progressively enhancing CSS delivery

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@onishiweb Fonts

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@onishiweb We ❤ web fonts

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@onishiweb

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@onishiweb

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@onishiweb 3s 3s 3s ∞ -

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@onishiweb Asynchronous font loading

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@onishiweb Font loading API

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@onishiweb var f = new FontFace("open_sansbold", "url(/fonts/ opensans-bold-webfont.woff)", {}); f.load().then(function (loadedFace) { document.fonts.add(loadedFace); document.body.style.fontFamily = "open_sansbold, serif"; });

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@onishiweb var f = new FontFace("open_sansbold", "url(/fonts/ opensans-bold-webfont.woff)", {}); f.load().then(function (loadedFace) { document.body.className += ' fonts—loaded'; }); /* CSS */ p { visibility: hidden; } .fonts-loaded p { visibility: visible; }

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@onishiweb Progressively enhancing font loading

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@onishiweb Font loading API http://caniuse.com/#feat=font-loading 41 43 31 ❌ ❌

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@onishiweb CSS Font Rendering http://tabatkins.github.io/specs/css-font-rendering/

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@onishiweb JavaScript

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@onishiweb – Peter Herlihy, GDS Team “1.1% of people aren’t getting JavaScript enhancements (1 in 93).”

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@onishiweb http://kryogenix.org/code/browser/everyonehasjs.html

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@onishiweb

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@onishiweb – Jeremy Keith “Brilliant easter egg in the newly- redesigned nasa.gov — if JavaScript fails, you are immersed in the experience of deep space”

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@onishiweb Frameworks

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@onishiweb – Jake Archibald “Nothing should have a JavaScript dependant first render, it only punishes the user.”

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@onishiweb Is there a better way?

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@onishiweb Universal JavaScript

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@onishiweb Server Side rendering with Node.js

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@onishiweb React

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@onishiweb React.renderToString();

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@onishiweb app.get('/', function(req, res){ // React.renderToString takes your component // and generates the markup ReactApp = React.createFactory( require('../ components/index.js') ); reactHtml = React.renderToString( ReactApp({}) ); // Output html rendered by react res.render('index.ejs', { reactOutput: reactHtml }); });

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@onishiweb Client side too

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@onishiweb GoCardless

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@onishiweb – Jack Franklin, GoCardless “If you visit it in a ‘good’ browser with JS on, you get an incredibly snappy React app, if not, you hit the server on every click.”

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@onishiweb Progressively enhancing JavaScript frameworks

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@onishiweb Control

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@onishiweb The Network

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@onishiweb Assumption

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@onishiweb @onishiweb Photo by Paul Robertson - https://flic.kr/p/9qSizG

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@onishiweb Mobile connectivity

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@onishiweb Cake or Death?

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@onishiweb Enter Service Worker

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@onishiweb Web vs Native!

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@onishiweb The web is going oﬄine!

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@onishiweb Browser cache

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@onishiweb @onishiweb

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@onishiweb Register service worker Cache content Response Request Render Usable website

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@onishiweb Cache Request Render Usable website Service worker Network

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@onishiweb if ('serviceWorker' in navigator) { navigator.serviceWorker.register('/worker.js') .then(function(registration) { // Registration was successful console.log('ServiceWorker registered: ', registration.scope); }) .catch(function(err) { // registration failed :( console.log('ServiceWorker registration failed: ', err); }); }

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@onishiweb self.addEventListener('install', function(event) { // Perform install steps event.waitUntil( caches.open(‘content-cache-v1’) .then(function(cache) { return cache.addAll([ '/index.html', '/css/main.min.css', '/main.js' ]);

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@onishiweb self.addEventListener('install', function(event) { // Perform install steps event.waitUntil( caches.open(‘content-cache-v1') .then(function(cache) { return cache.addAll([ '/index.html', '/css/main.min.css', '/main.js' ]);

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@onishiweb self.addEventListener('fetch', function(event) { event.respondWith( caches.match(event.request) .then(function(response) { // Cache hit - return response if (response) { return response; } return fetch(event.request); } ) ); });

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@onishiweb

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@onishiweb https://jakearchibald.com/2014/offline-cookbook/

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@onishiweb Tricky bits

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@onishiweb Development ﬂow https://www.chromium.org/blink/serviceworker/getting-started#TOC- Development-flow

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@onishiweb chrome://inspect/#service-workers @onishiweb

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@onishiweb chrome://serviceworker-internals/ @onishiweb

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@onishiweb HTTPS only

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@onishiweb – MDN “Having modified network requests wide open to man in the middle attacks would be really bad.”

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@onishiweb How much can I cache?

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@onishiweb Progressively enhancing the network

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@onishiweb Browser support…

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@onishiweb https://jakearchibald.github.io/isserviceworkerready/

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@onishiweb Return of the browser wars

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@onishiweb Not really

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@onishiweb Stop assuming

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@onishiweb – Bruce Lawson “It never pays to make too many assumptions about your users.”