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@adunkman Executing JavaScript Across Browser Contexts

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@adunkman Standard Browser APIs

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@adunkman Between Tabs Outside Tabs

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Washington, DC

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Pittsburgh, PA

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Los Angeles, CA

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New Paltz, NY

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Mayne Island, BC

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@adunkman You need to write well to program

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@adunkman You don’t need to hear to program

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@adunkman Open access to learning resources

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@adunkman confa11y.com

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@adunkman confally.com

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@adunkman a11yconf.com

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@adunkman allyconf.com

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@adunkman Pull Request Opportunities

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@adunkman Standard Browser APIs

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@adunkman

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@adunkman

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@adunkman Cache-Control

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@adunkman

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@adunkman There’s more to the web than web pages

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@adunkman Browser Contexts

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@adunkman Window Sandbox

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@adunkman Domain-Level Objects

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@adunkman Why isn’t this better?

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@adunkman document.cookie

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Bob Dunkman c. 1977

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Bob Dunkman c. 2016

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@adunkman document.cookie

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In document.cookie = cookieName + "=" + encodeURIComponent(json);

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In Out document.cookie = cookieName + "=" + encodeURIComponent(json); var regex = new RegExp( "(?:(?:^|.*;)\\s*" + n + "\\s*\\=\\s*([^;]*).*$)|^.*$");

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In Out Detect document.cookie = cookieName + "=" + encodeURIComponent(json); var regex = new RegExp( "(?:(?:^|.*;)\\s*" + n + "\\s*\\=\\s*([^;]*).*$)|^.*$"); setInterval(checkForChanges, pollingInterval);

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@adunkman Please don’t.

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@adunkman document.cookie localStorage

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@adunkman QuotaExceededError

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@adunkman document.cookie localStorage

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In localStorage.setItem( keyName, json);

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In Out localStorage.setItem( keyName, json); localStorage.getItem( keyName);

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In Out Detect localStorage.setItem( keyName, json); localStorage.getItem( keyName); window.addEventListener( “storage", function (event) { ...

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var tabId = Math.random(); video.addEventListener("play", function () { localStorage.setItem("playing_tab", tabId); }); window.addEventListener("storage", function (event) { var isThisKey = event.key === "playing_tab"; var notThisTab = event.newValue !== tabId; if (isThisKey && notThisTab) { video.pause(); } });

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var tabId = Math.random(); video.addEventListener("play", function () { localStorage.setItem("playing_tab", tabId); }); window.addEventListener("storage", function (event) { if (event.key === "playing_tab" && event.newValue !== tabId) { video.pause(); } });

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var tabId = Math.random(); video.addEventListener("play", function () { localStorage.setItem("playing_tab", tabId); }); window.addEventListener("storage", function (event) { if (event.key === "playing_tab" && event.newValue !== tabId) { video.pause(); } }); 9

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@adunkman Between Tabs Outside Tabs

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@adunkman WebWorker

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@adunkman SharedWorker

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@adunkman Tab 1 Tab 2 Tab 3 worker.js 1 worker.js 2 worker.js 3

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@adunkman Tab 1 Tab 2 Tab 3 worker.js 1

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$

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External Page

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External Page Harvest Script

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External Page Harvest Script

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External Page Harvest Script

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External Page Harvest Script SharedWorker

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External Page Harvest Script SharedWorker WebSocket

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@adunkman SharedWorker

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@adunkman Great for sharing processing and resources Not great for 
 working in Safari

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@adunkman SharedWorker

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@adunkman ServiceWorker

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@adunkman Service workers essentially act as proxy servers that sit between web applications, and the browser and network (when available). … They will also allow access to push notifications and background sync APIs. –MDN

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@adunkman Service workers essentially act as proxy servers that sit between web applications, and the browser and network (when available). … They will also allow access to push notifications and background sync APIs. –MDN

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@adunkman A service worker is an event- driven worker registered against an origin and a path. –MDN

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@adunkman A service worker is an event- driven worker registered against an origin and a path. –MDN

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@adunkman Service workers are a new browser feature that provide event-driven scripts that run independently of web pages. –W3C

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@adunkman Service workers are a new browser feature that provide event-driven scripts that run independently of web pages. –W3C

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@adunkman A service worker is a process which is tied to domain events rather than to a browsing context. –me

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@adunkman Tab 1 worker.js 1 Domain Events worker.js 1

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@adunkman Domain Events worker.js 1 push sync fetch

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@adunkman “push” event

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@adunkman Notification Service

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); });

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1 (new version)

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1 Tab 2 (new version)

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 1 worker.js 1 Tab 2 (old) worker.js 1 (new version)

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); });

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Tab 2 (new) worker.js 1

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Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); Worker self.addEventListener("install", function (event) { self.skipWaiting(); });

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Worker Page navigator.serviceWorker.register("sw.js") .then(function (reg) { console.log("success", reg); }).catch(function (err) { console.log("fail", err); }); self.addEventListener("push", function (event) { console.log("message", event); }); self.addEventListener("install", function (event) { self.skipWaiting(); });

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@adunkman “push” event

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@adunkman Browser message server (like native app) Wakes ServiceWorker to process event

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@adunkman “sync” event

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Worker Page navigator.serviceWorker.ready .then(function (reg) { return reg.sync.register("syncTime"); }); self.addEventListener("sync", function (event) { if (event.tag === "syncTime") { event.waitUntil(stuff()); } });

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Tab 1 worker.js 1

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Tab 1 worker.js 1 sync “syncTime”

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Tab 1 worker.js 1 sync “syncTime” Browser

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worker.js 1 Browser

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worker.js 1 Browser

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@adunkman “sync” event

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@adunkman Great for backgrounding a sync process, even in limited or no connectivity

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@adunkman “fetch” event

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Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

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Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

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Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

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Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

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Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

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Worker self.addEventListener("fetch", function (event) { console.log(event.request.url); event.respondWith( caches.match(event.request) .then(function (response) { if (response) { return response; } return fetch(event.request) .then(function (response) { return response; }).catch(function (error) { throw error; }); }) ); });

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@adunkman “fetch” event

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@adunkman Programmatic access to browser cache Replaces AppCache Allows custom offline logic Is completely encapsulated

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@adunkman push, sync, fetch

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@adunkman ServiceWorker

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@adunkman HTTPS/localhost only Not persistent Not tied to browser context Domain events

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@adunkman There’s more to the web than web pages

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getharvest.com/careers dunkman.me/talks/ato @adunkman