The Wonderful World of HTML5

Using and embracing the future of the web

What in the world is HTML5?

The inevitable successor to HTML4 and XHTML1› XHTML2 no longer the future, or alive for that matter

HTML over HTML as XML (XHTML)› Does not mean it’s SGML (HTML5 requires an XML Mime-type)› But you can still choose to write XHTML in HTML5 (XHTML5)

HTML made for web applications› Javascript APIs that implement new services› Ability to edit data online and offline› Many things we needed to use Javascript for, we no longer need to› New tags that improve semantics and expand content› Less dependent on plugins

HTML5 is set to become the norm in a few years We can use HTML5 today!

› Even in IE6-8 with a bit of Javascript & graceful degradation

The Same Old Story

We already know a bit about the most popular tags› <canvas>› <audio>› <video>

We’re going to demo these tags But that’s just the tipping point…

Did you know that HTML5… Allows you to insert inline SVG graphics?

› <svg> Insert in MathML math equations?

› <math> Points out where page elements are?

› <header>› <footer>› <nav>

We can create datasets?› data-fullpath in tag elements

Easily implement a plugin component?› <embed>

Yes, it is now part of the standard Add in date fields with calendars?

Wait, there’s more!

Validate form content without JavaScript?

Run applications offline? Store data in two different databases? Make any element draggable? And much more…

Every Direction is North

Every tag you could ever want› http://www.html-5.com/tags/index.xhtml

The Three Amigos

Wait, didn’t you just give a speech about these tags at a PHP User Group meeting?

All Demos: http://bit.ly/a5wXFE

Demonstration Code

All the demos henceforth can be viewed here› http://bit.ly/a5wXFE

<canvas>

An immediate-mode bitmap element we can draw to› tl;dr it’s a bitmap element we can alter using Javascript› Is not based on vector graphics› Lives in harmony with SVG

Perfect for fast rendering› We can even render video in it!

Currently exists in the form of a 2D Context – that is, we can only draw 2D shapes› 3D context proposed (WebGL)

Can be partially implemented in Javascript for Internet Explorer› excanvas.js

Reference: http://bit.ly/94Ycl1

Can

vas v

s. S

VG

Canvas

SV

G

Renders very quickly 2D Context (with 3D context proposed) Has no DOM Not yet accessible Interfaced strictly using Javascript

› This includes animations Bitmap Does not render as fast No real 3D context unless you want to get hacky Has a DOM Can be interfaced with using Javascript and SMIL

› Animated using both Accessible Vector

<audio>

An easier way to embed audio into a page Audio is just easier now, no need for any kind of plugin We can interface with this tag using Javascript Codecs used for audio

› MP3› PCM Wave (WAV)› Ogg Vorbis

Our Demo is a jukebox with music› Uses Ogg Vorbis› The music is also free to download!

Ogg Theora MP3 All Reference: http://bit.ly/bDkXOh

<video>

Video in a Flash (without that other thing) Can be interfaced with using Javascript

› And <canvas>› And SVG

No baseline codec for <video> Two generally accepted codecs

› H.264 AVC› Ogg Theora

Our Demo uses H.264 and Ogg› Safari and Chrome only

Ogg Theora QTKit Both Reference: http://bit.ly/bDkXOh

The Working Group APIs

This is where the magic happens

Geolocation

Not to be used for stalking› Spec requires all instances of geolocation to be initiated by the

user Agnostic to browser methods used to determine location

› GPS› 3G/Wifi triangulation› IP Traceroute› Opt-in location

Not just limited to W3C Implementation› Blackberry, Palm, Gears, et al have their own Geolocation

classes and methods› Lack of ubiquity between these methods

Geolocation Continued

Our demo uses the Geo.js library› Provides abstraction between all the

Geolocation methods at our disposal Gears is typically more accurate at

providing location› Google has been collecting location data

using Street View cars

Using Geolocation (W3C)

navigator.geolocation.getCurrentPosition();

To poll for location one-time

navigator.geolocation.watchPosition();

To continuously poll for location

navigator.geolocation.getCurrentPosition(function(position) {    do_something(position.coords.latitude, position.coords.longitude);  });  

Demonstration function

Reference: http://bit.ly/c3i7nY

Using geo.js

if(geo_position_js.init()){   geo_position_js.getCurrentPosition(success_callback,error_callback);}else{   alert("Functionality not available");}

To poll for location one-time

if(geo_position_js.init()){   geo_position_js.watchPosition(success_callback,error_callback);}else{   alert("Functionality not available");}

To continuously poll for location

Reference: http://bit.ly/b1EfnM

Web Storage

Considerably better than having to use a lot of cookies

We can store using two distinct database methods› Key-Value› SQL

Combine with offline support for epic win

Key-Value Web Storage

Quote @chrisdavidmills: “Cookies on Crack”

A better way to store persistence data› Works offline› Cookies can be moved back to being just

session data storage Easy to add and remove data from They even work in Internet Explorer 8!

K/V Web Storage Continued

Two distinct storage classes› sessionStorage

Global storage instance that lasts until the end of the session

› localStorage Storage isntance that lasts until either cleared by

the browser, the DOM, or the user For now we’ll demonstrate localStorage

› Methods to access sessionStorage are the same

localStorage

Reference: http://bit.ly/d4CaSL

Using K/V Web Storage

value = localStorage.setItem(name);

Store a value

value = localStorage.getItem(name);

Recover a value

localStorage.removeItem(name);

Remove a value

localStorage.clear();

Clear the entire database

SQL Web Storage

Meant for use in Offline web applications› Based on statements in HTML5 WG Drafts

Currently W3C Spec calls for featureset “similar” to Sqlite 3.6.19› Spec is frozen because not all user-agents

are expected to use Sqlite nor does the W3C give any baseline of what version of SQL to support

Reference: http://bit.ly/dwNL80

Web Workers

We can use Web Workers to run JavaScript in OS threads

Abstracting intense algorithms or functions to web workers can significantly improve web app function and decrease risk of failure

Workers can’t interface with the DOM, so they should be treated like software libraries Reference: http://bit.ly/btoTEl

The Relative Future of HTML5Codec and patent trolls, and that company that makes Photoshop

The reality of licensing fees

Thankfully, the MPEG-LA has chosen to extend its current licensing rates on H.264 AVC until 2018 (???)› Free for the first 100,000 views› $.35 USD per individual view from content provider after 100,000

views Still, no patent-free codecs has been approved by the W3C

› Nokia and Apple lobbied Ogg Vorbis/Theora out over fears of submarine patents

Current proposals suggest using older ITU-T standards or Dirac Google acquired On2 Media, the supplier of VP6 & VP8 MP3 will be completely patent-free in 2017

› That is, if submarine patents don’t surface

An Adobe isn’t a Glass House

Much of HTML5 is split into Working Groups Canvas (or Context 2D) is a working group

that has gained a lot of traction Adobe has put this working group on hold

over claims revealed to be milestone related If Adobe is really doing this to slow down

Context 2D while they keep selling Flash, they aren’t being upfront about it

Any Questions?

The code is yours, take it Get the demo code used here

› git clone git://github.com/ghostfreeman/DevChatt-HTML5-Code.git› http://ghostfreeman.net/p2/devchatthtml5/DevChatt-HTML5-Code.tar.gz

Absorb Everything HTML5› http://doctype.tv

Has a series of podcasts covering HTML5, notably web storage› http://html5doctor.com› Search #HTML5 on Twitter› http://reddit.com/r/html5

Get this slideshow› http://slideshare.net/ghostfreeman keep pressing F5

Make My Life Difficult› http://ghostfreeman.net› @ghostfreeman on Twitter