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Schöne neue Welt von HTML5
NEUE TECHNOLOGIEN IM KONTEXT




Patrick H. Lauke / MultimediaTreff 28 / Köln / 3 Dezember 2011
Web Evangelist bei Opera
...ist HTML5 heute schon nutzbar?
www.textfiles.com/underconstruction
"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
http://www.flickr.com/photos/24374884@N08/4603715307/
HTML5…ohne Hype?
Geschichte von HTML5

1999 HTML 4.01
2000 XHTML 1.0
2004 W3C Fokus auf XHTML 2.0
    …die Zukunft ist XML!

      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 ersetzt nicht HTML 4.01
HTML5 hat mehr Bling!
HTML5 Spezifikation für
          Browserhersteller
(wie interpretieren Browser Markup/Code – kein “reverse engineering”)


für Autoren: HTML5 differences from HTML4
                  http://www.w3.org/TR/html5-diff/
1. Syntax/Semantik
2. Formulare
3. Multimedia
1. Syntax/Semantik
2. Formulare
3. Multimedia
HTML5 standardisiert
derzeitiges Browserverhalten
       (e.g. “relaxed” coding rules)
<b><i>Yo!</b></i>
software.hixie.ch/utilities/js/live-dom-viewer/
das schmutzige Geheimniss der
         Doctype
HTML5
<!DOCTYPE html>
<meta charset=”utf-8” />

<meta charset=utf-8>

<MeTa CHarSet=utf-8>
<style type=”text/css”>
</style>

<script type=”text/javascript”>
</script>
<style type=”text/css”>
</style>

<script type=”text/javascript”>
</script>
<!doctype html>
<title>Minimales HTML5</title>
neue Elemente für bessere Semantik
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
explizit und maschinenlesbar
   ...z.B. Screenreaders?
neue und alte Browser “unterstützen” die Elemente
(obwohl einige etwas Hilfe brauchen)

header, footer, … { display: block; }
Internet Explorer <9 braucht Stützräder
document.createElement('header');
document.createElement('footer');
…

http://html5doctor.com/how-to-get-html5-working-in-ie-and-firefox-2
1. Syntax/Semantik
2. Formulare
3. Multimedia
bessere Formelemente
  weil das Web interaktiver ist
jqueryui.com
rich form elements – ganz ohne 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>
Typen und Attribute mit
eingebauter Validierung
<input   … required>
<input   type=”tel”>
<input   type=”email”>
<input   type=”url”>
<input   … pattern="[a-z]{3}[0-9]{3}">
people.opera.com/patrickl/experiments/forms/newtypes.html
people.opera.com/patrickl/experiments/forms/validation.html
1. Syntax/Semantik
2. Formulare
3. Multimedia
making your site Fonzie compliant...
<video>
Adobe Flash derzeit meistbenutztes Art,
        Videos zu übermitteln
<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
  loop
  preload
  poster="poster.jpg"
  width="320" height="240">
    <a href="video.webm">Download movie</a>
</video>
Video als natives object
●
  verhält sich wie jedes andere HTML Element
●
  keyboard accessibility von Haus aus
people.opera.com/patrickl/experiments/video/hover+transition
mächtige (einfache) API
icant.co.uk/easy-youtube
<video> per JavaScript ansteuern
var v = document.getElementById('player');

v.play();
v.pause();
v.volume = … ;
v.currentTime = … ;
…
events vom <video> abfangen
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)
…
people.opera.com/patrickl/experiments/webm/basic-controls
people.opera.com/patrickl/experiments/webm/fancy-controls
people.opera.com/patrickl/experiments/webm/fancy-swap
Video Formate
  die grosse Debatte
MP4 / H.264




weitverbreitet, Lizenzen/Royalties
Ogg Theora




“free and open”, keine Lizengebühren
wenige Tools, nicht für's Web optimiert
WebM




   von Google, aber “open and royalty-free”
                Web-optimiert
Support von Software- und Hardware-Herstellern
Video mit multiple sources
<video controls autoplay poster="…" width="…" height="…">
   <source src="movie.webm" type="video/webm" />
   <source src="movie.mp4" type="video/mp4" />
   <!-- fallback content -->
</video>
Flash fallback für ältere browsers
 http://camendesign.com/code/video_for_everybody
<video controls autoplay poster="…" width="…" height="…">
   <source src="movie.webm" type="video/webm" />
   <source src="movie.mp4" type="video/mp4" />

   <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>
<audio>
Audio...genau das gleiche
<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>

Formate: MP3 vs Ogg Vorbis (vs WAV)
<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(…);
people.opera.com/patrickl/experiments/canvas/particle/3
mariuswatz.com/works/abstract01js
canvas und externe Bildformate
ctx = canvas.getContext("2d");

var logo = new Image();
logo.src = 'logo.png';

ctx.drawImage(logo,x1,y1,w1,h1,x2,y2,w2,h2);
www.splintered.co.uk/experiments/archives/paranoid_0.3
canvas zugriff auf Bilddaten
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, … ]
www.splintered.co.uk/experiments/archives/canvas-ambilight
github.com/mezzoblue/PaintbrushJS
canvas und video
ctx = canvas.getContext("2d");
v = document.getElementById('player');

ctx.drawImage(v,x1,y1,w1,h2,x2,y2,w2,h2);
html5doctor.com/video-canvas-magic
media.chikuyonok.ru/ambilight
canvas accessibility?
video, audio und canvas auch auf Devices
       ohne “Steck-eins” (plugins)
          (nicht jeder hat Java / Flash / Silverlight)
HTML5 (und Freunde) hat
viele APIs für Developer
     (für mächtige client-side Apps)
is it all safe to use, right now?
www.youtube.com/html5
vorsicht: browser sniffing



       http://www.flickr.com/photos/timdorr/2096272747/
caniuse.com
feature-detection
progressive enhancement, graceful degradation – or use shims
                    http://diveintohtml5.org/everything.html
modernizr.com
yepnopejs.com
alten Browser patchen
github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills
HTML5 als Flashkiller?
nicht die Frage ob
HTML5 als Ersatz für Flash gut ist...
giving developers a choice!
...ist HTML5 heute schon nutzbar?
“The future is already here – it's
just not very evenly distributed”
William Gibson
www.opera.com/developer
   patrick.lauke@opera.com

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