Speak the Web 15.02.2010

The future of web technologies LET'S FIRE UP THE FLUX CAPACITOR... Patrick H. Lauke / Speak the Web / Liverpool / 15 February 2010

Web Evangelist at Opera

new technologies you can start using today

HTML5 <!DOCTYPE html>

history of HTML5 ● started at Opera – Web Applications 1.0 ● reaction to XHTML's direction ● Mozilla and Apple joined ● W3C HTML5 ● Microsoft involvement

HTML5 standardises current browser and authoring behaviour (e.g. relaxed coding rules)

HTML5 does not replace HTML 4.01

HTML5 has more bling!

“...extending the language to better support Web applications, since that is one of the directions the Web is going in and is one of the areas least well served by HTML so far. This puts HTML in direct competition with other technologies intended for applications deployed over the Web, in particular Flash and Silverlight.” Ian Hickson, Editor of HTML5 http://lists.w3.org/Archives/Public/public-html/2009Jan/0215.html

HTML5 is umbrella term: markup elements and JavaScript APIs

new elements for more accurate semantics

HTML5 elements for a typical blog

HTML5 – unambiguous and machine readable

current and old browsers “support” these (although some need a little extra help) header, footer, … { display: block; }

Internet Explorer needs extra training wheels document.createElement('header'); document.createElement('footer'); … http://html5doctor.com/how-to-get-html5-working-in-ie-and-firefox-2

webforms – more powerful form elements

rich form elements – without JavaScript <input type=”date”> <input type=”time”> <input type=”month”> <input type=”week”> <input type=”datetime” … > <input type=”range”> <input type=”number”> <input type=”file” multiple> <input … autofocus> <input … autocomplete>

rich form elements – without JavaScript <input type=”text” list=”mylist”> <datalist id="mylist"> <option label="Mr" value="Mr"> <option label="Ms" value="Ms"> … </datalist>

type and attributes for built-in validation (of course you should still validate on the server) <input type=”tel”> <input type=”email”> <input type=”url”> <input … pattern="[a-z]{3}[0-9]{3}"> <input … required> Demonstration of webforms

canvas = “scriptable images”

canvas has standard API methods for drawing ctx = canvas.getContext("2d"); ctx.fillRect(x, y, width, height); ctx.beginPath(); ctx.moveTo(x, y); ctx.lineTo(x, y); ctx.bezierCurveTo(x1, y1, x2, y2, c1, c2); …

canvas mixing things up with external graphics ctx = canvas.drawImage(…); Demonstration of canvas

canvas accessibility concerns

canvas appropriate use for enhanced visuals, special effects – not pure content Demonstration: http://www.filamentgroup.com/examples/charting_v2/

<video>

<video src="video.ogv" controls autoplay poster="poster.jpg" width="320" height="240"> <a href="video.ogv">Download movie</a> </video>

video as native object...why is it important? ● “play nice” with rest of the page ● keyboard accessibility built-in ● API for controls Demonstration of video

video format debates – H.264 vs OGG Theora <video controls autoplay poster="…" width="…" height="…"> <source src="movie.ogv" type="video/ogg" /> <source src="movie.mp4" type="video/mp4" />  </video> still include fallback for old browsers http://camendesign.com/code/video_for_everybody

canvas accessibility concerns

video and canvas on any device without plugins (Java / Flash / Silverlight not ubiquitous)

1.21 gigawatts? Great Scott! Patrick frantically mentions lots of other HTML5 goodies in a few minutes...

geolocation

find out your location via JavaScript navigator.geolocation.getCurrentPosition(success, error); function success(position) { /* where's Waldo? */ var lat = position.coords.latitude; var long = position.coords.longitude; ... }

offline support

detect if a browsers goes offline window.addEventListener('online', function(){ … }, true); window.addEventListener('offline', function(){ … }, true);

storage

localStorage/sessionStorage like cookies... document.cookie = 'key=value; expires=Thu, 15 Feb 2010 23:59:59 UTC; path=/' … /* convoluted string operations go here … */

localStorage/sessionStorage like cookies...on steroids! localStorage.setItem(key, value); localStorage.getItem(key); localStorage.clear(); localStorage.key = value; if (localStorage.key == '…') { … } …

Web Database – full relational DB / SQL var db = openDatabase(dbName, version, displayName, expectedSize); db.transaction(function(tx) { tx.executeSql(sqlStatement, [], function (tx, result) { /* do something with the results */ }); });

application cache

cache UI/resource files for offline use <html manifest=”blah.manifest”> CACHE MANIFEST # send this with correct text/cache-manifest MIME images/sprites.png scripts/common.js scripts/jquery.js styles/global.css

and more! (geolocation, drag and drop, server-sent events, web workers, …)

www.opera.com/developer people.opera.com/patrickl/presentations/speaktheweb_15.02.2010/speaktheweb_15.02.2010.pdf patrick.lauke@opera.com

Speak the Web 15.02.2010

by Patrick Lauke on Feb 15, 2010

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Speak the Web 15.02.2010 — Presentation Transcript

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