brave new world of html5
DESCRIPTION
In this, my talk for Webinale in Berlin, June 1st 2011, I give an overview of HTML5 history and main features, relating it all back to how possible it is use develop with these new features today. Thanks to Patrick Lauke for allowing me to steal a lot of his slides ;-)TRANSCRIPT
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(Brave new world of) HTML5
Chris Mills, Opera Software / Webinale 2011, Berlin, May 31st
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Open standards evangelist at OperaHTML5 / CSS3 wrangler
dev.opera.comslideshare.net/chrisdavidmills
Education agitator
Also heavy metal drummer
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...should I use HTML5 today?
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"there is already a lot of excitement for HTML5, but it’s a little too early to deploy it because we’re running into interoperability issues."
Philippe Le Hegaret, W3C interaction domain leader
blogs.techrepublic.com.com/hiner/?p=6369
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http://www.flickr.com/photos/24374884@N08/4603715307/
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HTML5…without the hype?
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A brief history of HTML5
1999 HTML 4.012000 XHTML 1.0
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2004 W3C focus on XHTML 2.0…the future is XML-based!
http://www.flickr.com/photos/craiga/17071467/
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WHATWGWeb Hypertext Application Technology Working Group
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2007 W3C HTML5 WG
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HTML5 does not replace HTML 4.01 / XHTML 1.0
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HTML5 has more bling!
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“...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 HTML5http://lists.w3.org/Archives/Public/public-html/2009Jan/0215.html
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HTML4.01 primarily definedmarkup elements
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HTML5 supercedesHTML 4.01, XHTML 1.0and DOM Level 2 HTML
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HTML5 adds/redefines markup elements
header, footer, nav, article …
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HTML5 extendsDOM Level 2
innerHTML / outerHTML getElementsByClassName()
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HTML5 aimed at browser devs
detailed algorithms for processing/error correction
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1. forms2. multimedia3. web apps
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1. forms2. multimedia3. web apps
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improved form elementsbecause the web is more interactive
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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>
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built-in validation without JavaScript<input … required><input type="tel"><input type="email"><input type="url"><input … pattern="[a-z]{3}[0-9]{3}"><input type="number" min="1" max="5">…
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people.opera.com/patrickl/experiments/forms/newtypes.html
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people.opera.com/patrickl/experiments/forms/validation.html
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validity checking with JavaScriptform.checkValidity()formelement.checkValidity()
formelement.setCustomValidity()
formelement.validity
interface ValidityState { readonly attribute boolean valueMissing; readonly attribute boolean typeMismatch; readonly attribute boolean patternMismatch; readonly attribute boolean tooLong; readonly attribute boolean rangeUnderflow; readonly attribute boolean rangeOverflow; readonly attribute boolean stepMismatch; readonly attribute boolean customError; readonly attribute boolean valid;};
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1. forms2. multimedia3. web apps
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<bling> ?
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<video>
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Adobe Flash currently most commonvideo delivery mechanism
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<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>
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<video src="video.webm"></video>
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<video src="video.webm" controls autoplay loop preload="none" poster="poster.jpg" width="320" height="240"> <a href="video.webm">Download movie</a></video>
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video as native object● behaves like any other HTML element● keyboard accessibility out-of-the-box
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powerful (simple) API
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controlling <video> with JavaScript
var v = document.getElementById('player');
v.play();v.pause();v.volume = … ;v.currentTime = … ;…
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events fired by <video>
var v = document.getElementById('player');
v.addEventListener('loadeddata', function() { … }, true)v.addEventListener('play', function() { … }, true)v.addEventListener('pause', function() { … }, true)v.addEventListener('timeupdate', function() { … }, true)v.addEventListener('ended', function() { … }, true)…
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people.opera.com/patrickl/experiments/webm/basic-controls
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people.opera.com/patrickl/experiments/webm/fancy-controls
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people.opera.com/patrickl/experiments/webm/fancy-swap
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HTML5 means all your old dHTML is cool again!
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video formatsthe big debate?
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HTML5 does not specify video container/codec
(same as with images in HTML 4.01)
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MP4/H.264or
Ogg Theoraor
WebM/VP8
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MP4 / H.264
ubiquitous, patent encumbered, licensing/royalties
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Ogg Theora
free and open, no licensing feesnot many tools for it, not web optimised
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WebM / VP8
open and royalty-free, web-optimisedsupport by hardware and software vendors
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providing multiple sources<video controls autoplay poster="…" width="…" height="…">
<source src="movie.mp4" type="video/mp4" /><source src="movie.webm" type="video/webm" />
<!-- fallback content --></video>
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flash fallback for older browsershttp://camendesign.com/code/video_for_everybody
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<video controls autoplay poster="…" width="…" height="…"><source src="movie.mp4" type="video/mp4" /><source src="movie.webm" type="video/webm" />
<object width="…" height="…" type="application/x-shockwave-flash" data="player.swf">
<param name="movie" value="player.swf" /><param name="flashvars" value=" … file=movie.mp4" /><!-- fallback content -->
</object>
</video>
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<audio>
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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>
formats: MP3 vs Ogg Vorbis (vs WAV)
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<canvas>
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canvas = “scriptable images”
<canvas width="…" height="…"></canvas>
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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);
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people.opera.com/patrickl/experiments/canvas/particle/3
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canvas drawing ready-made images
ctx = canvas.getContext("2d");
var logo = new Image();logo.src = 'logo.png';
ctx.drawImage(logo,x1,y1,w1,h1,x2,y2,w2,h2);
or call in an existing image already on the page
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www.splintered.co.uk/experiments/archives/paranoid_0.3
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canvas access to image data array
ctx = canvas.getContext("2d");canvasData = ctx.getImageData(x,y,w,h);
[R,G,B,A,R,G,B,A,R,G,B,A,R,G,B,A, … ]
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canvas also works with video
ctx = canvas.getContext("2d");v = document.getElementById('player');
ctx.drawImage(v,x1,y1,w1,h2,x2,y2,w2,h2);
grab currently displayed frame (update as appropriate)
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canvas accessibility?
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video, audio and canvas on any devicewithout plugins
(Java / Flash / Silverlight not ubiquitous)
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1. forms2. multimedia3. web apps
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HTML5 (and friends) haslots more APIs for developers
(for powerful client-side apps)
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geolocationnavigator.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;...
}
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application cache<html manifest="blah.manifest">
CACHE MANIFEST# send this with correct text/cache-manifest MIMEimages/sprites.pngscripts/common.jsscripts/jquery.jsstyles/global.css
NETWORK:# never cached (apart from normal caching mechanism)onlineonly.css
FALLBACK:# pattern matching. fallback file will also be cachedimages/ images/not-offline.png
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data storage
cookies and their limitations...
document.cookie = 'key=value; expires=Thu, 15 Feb 2010 23:59:59 UTC; path=/'…
/* convoluted string operations go here … */
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localStorage/sessionStoragelocalStorage.setItem(key, value);localStorage.getItem(key);localStorage.clear();localStorage.key = value;if (localStorage.key == '…') { … }…
localStorage – persistent per domainsessionStorage – current URL and window in session
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WebSQL
relational DB / SQL in browser
var db =openDatabase(dbName, version, displayName, expectedSize);
db.transaction(function(tx) {tx.executeSql(sqlStatement, [], function (tx, result) {
/* do something with the results */});
});
not being developed further (IE/Mozilla prefer IndexedDB) – nonetheless available right now in Opera+WebKit!
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etcFile API, Web Workers, History API, Web Messaging,Drag and Drop, Server-Sent Events…
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is it all safe to use, right now?
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don't do browser sniffing
http://www.flickr.com/photos/timdorr/2096272747/
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feature-detectionprogressive enhancement, graceful degradation
http://diveintohtml5.org/everything.html
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patching older browsersgithub.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills
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HTML5 as Flashkiller?
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not a question ofHTML5 replacing Flash...
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giving developers a choice!
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...should I use HTML5 today?
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“The future is already here – it's just not very evenly distributed”William Gibson
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http://[email protected]