Transcript
The future of web technologies
Patrick H. Lauke / Speak the Web / Liverpool / 15 February 2010
LET'S FIRE UP THE FLUX CAPACITOR...
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 HTML5http://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 wheelsdocument.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>
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>
<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&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
<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" /><!-- fallback content -->
</video>
still include fallback for old browsershttp://camendesign.com/code/video_for_everybody
canvas accessibility concerns
video and canvas on any devicewithout 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/sessionStoragelike cookies...
document.cookie = 'key=value; expires=Thu, 15 Feb 2010 23:59:59 UTC; path=/'…/* convoluted string operations go here … */
localStorage/sessionStoragelike 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 MIMEimages/sprites.pngscripts/common.jsscripts/jquery.jsstyles/global.css
and more!(geolocation, drag and drop, server-sent events, web workers, …)
www.opera.com/developerpeople.opera.com/patrickl/presentations/speaktheweb_15.02.2010/speaktheweb_15.02.2010.pdf
patrick.lauke@opera.com
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