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HTML5 and friends - Institutional Web Management Workshop 2010
 

HTML5 and friends - Institutional Web Management Workshop 2010

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    HTML5 and friends - Institutional Web Management Workshop 2010 HTML5 and friends - Institutional Web Management Workshop 2010 Presentation Transcript

    • HTML5 and friends CONTEXTUALISING THE NEW TECHNOLOGIES Patrick H. Lauke / Institutional Web Managers Workshop IWMW2010 / Sheffield / 13 July 2010
    • Web Evangelist at Opera
    • ...should I use HTML5 today?
    • http://www.flickr.com/photos/24374884@N08/4603715307/
    • HTML5 … without the hype?
    • history of HTML5 ● 1999 HTML 4.01, 2000 XHTML 1.0 ● 2003 XForms specification > XML based ● Opera proof of concept: Web Forms 1.0
    • 2004 W3C focus on XHTML 2.0 and beyond... http://www.flickr.com/photos/craiga/17071467/
    • WHATWG Web Hypertext Application Technology Working Group
    • 2007 W3C HTML5 WG
    • “...extending the language to better support Web applications [...] This puts HTML in direct competition with other technologies[...] , in particular Flash and Silverlight.” Ian Hickson, Editor of HTML5 http://lists.w3.org/Archives/Public/public-html/2009Jan/0215.html
    • HTML5 does not replace HTML 4.01
    • HTML5 has more bling!
    • HTML5 specification aimed at browser developers (defines how browsers handle markup/code – no reverse engineering) for authors: HTML5 differences from HTML4 http://www.w3.org/TR/html5-diff/
    • HTML5 standardises current browser and authoring behaviour (e.g. “relaxed” coding rules)
    • HTML5 <!DOCTYPE html>
    • HTML5 brings new markup elements and JavaScript APIs
    • new elements for more accurate semantics
    • Top 20 class names 1. footer 11. button 2. menu 12. main 3. style1 13. style3 4. msonormal 14. small 5. text 15. nav 6. content 16. clear 7. title 17. search 8. style2 18. style4 9. header 19. logo 10. copyright 20. body http://devfiles.myopera.com/articles/572/classlist-url.htm
    • Top 20 id names 1. footer 11. search 2. content 12. nav 3. header 13. wrapper 4. logo 14. top 5. container 15. table2 6. main 16. layer2 7. table1 17. sidebar 8. menu 18. image1 9. layer1 19. banner 10. autonumber1 20. navigation http://devfiles.myopera.com/articles/572/idlist-url.htm
    • unambiguous and machine readable ...but what about current screenreaders?
    • 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
    • improved forms making common UI needs native
    • 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>
    • type and attributes for built-in validation (of course you should still validate on the server) <input … required> <input type=”tel”> <input type=”email”> <input type=”url”> <input … pattern="[a-z]{3}[0-9]{3}"> Demos: http://people.opera.com/patrickl/experiments/forms/newtypes.html http://people.opera.com/patrickl/experiments/forms/date-time.html http://people.opera.com/patrickl/experiments/forms/validation.html
    • <video>
    • Adobe Flash currently most common video delivery mechanism
    • <object width="425" height="344"> <param name="movie" value="http://www.youtube.com/v/9sEI1AUFJKw&hl=en &fs=1&"></param> <param name="allowFullScreen" value="true"></param> <param name="allowscriptaccess" value="always"></param> <embed src="http://www.youtube.com/v/9sEI1AUFJKw&hl=en&f s=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed> </object>
    • <video src="video.webm" controls autoplay poster="poster.jpg" width="320" height="240"> <a href="video.webm">Download movie</a> </video>
    • video as native object ● “plays nice” with rest of the page ● keyboard accessibility built-in ● API for controls: v = document.getElementById('myVideo'); v.play(); v.pause(); … Demos: http://people.opera.com/patrickl/experiments/webm/basic-controls/ http://people.opera.com/patrickl/experiments/webm/fancy-controls/ http://people.opera.com/patrickl/experiments/webm/fancy-swap/
    • video formats the big debate
    • MP4 / H.264 ubiquitous, patent encumbered, licensing/royalties
    • Ogg Theora “free and open”, no licensing/royalties not many tools for it, not web optimised
    • WebM open and royalty-free, web optimised support by software and hardware vendors
    • providing multiple sources <video controls autoplay poster="…" width="…" height="…"> <source src="movie.webm" type="video/webm" /> <source src="movie.ogv" type="video/ogg" /> <source src="movie.mp4" type="video/mp4" /> <!-- fallback content --> </video> still include fallback for old browsers http://camendesign.com/code/video_for_everybody
    • audio exactly the same as video <audio src=”music.mp3” controls autoplay></audio> [...] <audio controls autoplay> <source src="music.mp3" type="audio/mpeg" /> <source src="music.oga" type="audio/ogg" /> <!-- fallback content --> </audio> same format debacle: MP3 vs Ogg Vorbis
    • <canvas>
    • canvas = “scriptable images” <canvas width="…" height="…"></canvas>
    • 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); ctx.drawImage(…); Trivial demo: http://www.splintered.co.uk/experiments/archives/paranoid_0.2/
    • Demos: http://alteredqualia.com/canvasmol/ http://dwpe.googlecode.com/svn/trunk/charting/index.html
    • canvas accessibility concerns
    • video, audio and canvas on any device without plugins (Java / Flash / Silverlight not ubiquitous)
    • HTML5 (and friends) has lots more APIs for developers (for powerful client-side apps)
    • isgeolocationpartofhtml5.com
    • geolocation navigator.geolocation.getCurrentPosition(success, error); navigator.geolocation.watchCurrentPosition(success, error); function success(position) { /* where's Wally? */ var lat = position.coords.latitude; var long = position.coords.longitude; ... }
    • offline detection... window.addEventListener('online', function(){ … }, true); window.addEventListener('offline', function(){ … }, true); and application cache <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 data.xml and many more... (even beyond HTML5)
    • is it all safe to use, right now?
    • don't do browser sniffing http://www.flickr.com/photos/timdorr/2096272747/
    • feature-detection progressive enhancement, graceful degradation – or use shims http://diveintohtml5.org/everything.html
    • HTML5 as Flashkiller?
    • not a question of HTML5 replacing Flash...
    • giving developers a choice!
    • ...should I use HTML5 today?
    • www.opera.com/developer people.opera.com/patrickl/presentations/iwmw2010_13.07.2010/iwmw2010_13.07.2010.pdf patrick.lauke@opera.com