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A Fast-Paced Overview of HTML5

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									    HTML5: The 30,000’ View
      A fast-paced overview of HTML5


                                                                By Peter Lubbers, Kaazing
                                                                       HTML5 User Group
                                                                           San Francisco
                                                                               May, 2010




1

          Copyright © 2010 - Kaazing Corporation. All rights reserved.
Thanks to the Sponsors!
• Twilio (event venue)
  Twilio’s software allows your web application to easily
  make and receive phone calls and SMS text messages
  using a simple web service API.
  Kaazing (event pizza and drinks)
  Kaazing WebSocket Gateway features patent-pending,
  ultra high-performance HTML5 WebSocket Acceleration™
  technology that enables companies to quickly deliver
  massively scalable, real-time web applications
• Marakana (event organization)
  Marakana provides cutting-edge open source software
  training in San Francisco, New York, Toronto, and on-
  demand corporate training
 2
                    Copyright © 2010 - Kaazing Corporation. All rights reserved.
About Peter Lubbers
• Director of Documentation and Training, Kaazing
• Co-Founder San Francisco HTML5 User Group
  http://www.sfhtml5.org/
• Co-author Pro HTML5 Programming
    o Alpha Release: www.prohtml5.com
    o Special 50% Off Coupon Code:
      APRESSPROHTML5WR
     (expires May 31st)
• Ultra Distance Runner
• Twitter: @peterlubbers

3
                          Copyright © 2010 - Kaazing Corporation. All rights reserved.
Agenda
•       HTML5 History and Vision
•       HTML5 Markup
•       HTML5 Forms
•       HTML5 APIs
•       Other HTML5 features
•       Developing HTML5 Applications
•       Q&A



    4
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
    Verbatim
    “The world is moving to HTML5”
      —Steve Jobs, Apple
    “The Web has not seen this level of
     transformation, this level of acceleration,
     in the past ten years… we're betting big on
     HTML5”
      —Vic Gundotra, VP of Engineering, Google
     “In a nutshell, we love HTML5, we love it so much we want
     it to actually work.
      —Dean Hachamovitch, General Manager for Internet Explorer,
       Microsoft
      “I had no idea there was so much HTML5 already in play”
5
      —Tim O’Reilly
                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
    HTML Timeline




6
      Copyright © 2010 - Kaazing Corporation. All rights reserved.
    HTML Timeline 1980-1990




7
            Copyright © 2010 - Kaazing Corporation. All rights reserved.
    HTML Timeline 1991-2000




8
            Copyright © 2010 - Kaazing Corporation. All rights reserved.
    HTML Timeline 2001-2011




9
            Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML Timeline 2012-2022




10
             Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Standards Bodies and
         Specifications




11
          Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML5 Standards Bodies
• Web Hypertext Application Technology Working
  Group (WHATWG)
     o Founded in 2004 (by individuals working for browser
       vendors Apple, Mozilla, Google, and Opera)
     o Develops HTML and APIs for web application
       development
     o Unofficial and open collaboration of browser vendors
       and interested parties
• World Wide Web Consortium (W3C)
     o Created draft of HTML5 in 2008
• Internet Engineering Task Force (IETF)
     o Protocols (HTTP, WebSocket)
12
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Specifications
     • WHATWG
        o http://www.whatwg.org/specs/web-apps/current-work/
     • W3C
        o http://dev.w3.org/html5/spec/Overview.html
     • IETF (WebSocket specification)
        o http://tools.ietf.org/html/draft-hixie-
          thewebsocketprotocol




13
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Is This HTML5?
     • Many pieces of the HTML5 effort (for example,
       Local Storage, WebSocket, and Geolocation)
       were originally part of the HTML5 specification
     • Moved to a separate standards document to
       keep the specification focused
     • Industry still refers to the original set of features,
       including Web Sockets, as "HTML5“
     • See:
       http://www.whatwg.org/specs/web-apps/current-
       work/multipage/introduction.html#is-this-html5?
14
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Vision and
     Design Principals




15
          Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Design Principal #1
     Compatibility
     • Pave the cow paths
     • Degrade gracefully
     • Research common
       behavior; solve real
       problems
     • Support existing
       content
     • Evolution not revolution
     • Don’t reinvent the wheel (or at least make a
16
       better one!)
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Design Principal #2
     Utility
     • Priority of Constituencies:
        o When in doubt… value users over authors, over
          implementers (browsers), over specifiers
          (W3C/WHATWG), over theoretical purity.
     • Secure by design
     • DOM consistency
       (HTML5 and XHTML5)
     • Separation of
       presentation and
       content
17
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Presentation vs. Content
     • HTML5 strives to separate content from
       presentation where possible (use CSS)
     • Most of the presentational features from
       earlier versions of HTML are no longer
       supported
     • This was already in the works (HTML4
       Transitional, XHTML1.1)
     • Problems with presentational markup:
       o Poor accessibility
       o Unnecessary complexity
18
       o Larger document size
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Design Principal #3
     Interoperability
     • Specify well-defined behavior
       o Specific instead of vague
     • Handle errors well
       o Improved and ambitious error
         handling plans
       o Prefer graceful error recovery to
         hard failure
     • Avoid needless complexity
       o Simple is better

19
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Simple is Better
     • Simplify wherever possible
     • Examples:
       o Native browser ability instead of complex
         JavaScript code
       o New doctype
       o Character set
       o HTML5 APIs




20
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
•
         HTML4/XHTML
     HTML 4.01 Strict
                              Simplified Doctype
•    HTML 4.01 Transitional
•    HTML 4.01 Frameset
•    XHTML 1.0 Strict
•    XHTML 1.0 Transitional
•    XHTML 1.0 Frameset
•    XHTML 1.1




    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML
    4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">


                                                                                             HTML5


    21
                                                                              <!DOCTYPE html>
                              Copyright © 2010 - Kaazing Corporation. All rights reserved.
 Simplified Character Set
                                  HTML4

<meta http-equiv="Content-Type"
 content="text/html; charset=utf-8">




                                    HTML5

           <meta charset="utf-8">


22
              Copyright © 2010 - Kaazing Corporation. All rights reserved.
     More Detail (Where Needed)
• HTML5 is more detailed than previous specs to
  avoid misinterpretation
• Aim to define
  things thoroughly,
  especially web
  applications
• ~900 Pages
  spread over
  multiple
  specifications
23
                Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Design Principal #4
     Universal Access
     • Support for all world
       languages
        o For example, <ruby>
          (Ruby annotations, used
          in East Asian typography)
     • Accessibility
        o Support users with disabilities
        o Web Accessibility Initiative (WAI) Accessible Rich
          Internet Applications (ARIA)
        o WAI-ARIA roles can be added today
24
        o Supported by screen readers
                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Plugin-Free Paradigm
     • HTML5 provides native support for many
       features that were only possible with plugins
       or complex hacks
       o Plugins may not be installed
       o Plugins can be disabled or blocked (iPad does not
         ship with Flash plugin)
       o Plugins are a separate attack vector
       o Plugins are difficult to integrate with the rest of an
         HTML document (plugin boundaries, clipping, and
         transparency issues)
       o Plugins are crash prone
25
                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML5 Features




26
        Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Features
     • HTML5 Markup
       o New and removed HTML elements
       o New content types
     • HTML5 Forms
     • HTML5 APIs
     • Other HTML5 Features




27
                    Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Markup




28
       Copyright © 2010 - Kaazing Corporation. All rights reserved.
New HTML5
Tags
                <article>           <aside>                                  <audio>            <canvas>


           <command>        <datalist>                                       <details>             <dialog>


      <embed>      <figure>             <footer>                                 <header>        <hgroup>


                <keygen>        <mark>                                 <meter>                             <nav>


       <output>        <ruby>                     <rt>                       <rp>            <section>


                 <source>                         <video>



 29
                              Copyright © 2010 - Kaazing Corporation. All rights reserved.
Removed Tags in HTML5
                            <acronym>

                                     <applet>                              <basefont>

     <big>                                                     <dir>              <font>

       <center>
                                                                               <s> <strike>

     <frame>                                                                         <u>
                <frameset>

               <noframes>                                  <tt>



30
                Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML5 Cheat Sheet




By Antonio Lupetti
http://woorkup.com/wp-content/uploads/2009/12/HTML5-Visual-Cheat-Sheet.pdf
31
                         Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Content Types
     • Metadata content
       o Elements—commonly found in the head section—
         that set up the presentation or behavior of the rest
         of the document, for example script, style,
         title
     • Flow content
       o Elements used in the body of documents and
         applications, for example form, h1, small
     • Sectioning content
       o Elements that define sections in the document, for
         example article, aside, title
32
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Content Types (Continued)
     • Heading content
       o Section headers, for example h1, h2, hgroup
     • Phrasing content
       o Text and text markup elements, for example mark,
         kbd, sub, sup, b
     • Embedded content
       o Content that imports other resources into the
         document, for example audio, video, canvas,
         iframe
     • Interactive content
       o Content that users interact with, for example
33       audio or video controls, button, textarea
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Anatomy of an
     HTML5 Page




34
       Copyright © 2010 - Kaazing Corporation. All rights reserved.
Anatomy of an HTML5 Page
     HTML code (head section)
     <!DOCTYPE html>
     <html>
       <head>
         <meta charset="utf-8" />
         <title>HTML 5</title>
         <link rel="stylesheet" href="html5.css">
       </head>




35
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
Anatomy of an HTML5 Page
     HTML code body section (part 1)
      <body>
        <header>
          <h1>Header</h1>
        </header>

        <div id="container">
          <nav>
            <h3>Nav</h3>
          </nav>



36
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
Anatomy of an HTML5 Page
     HTML code body section (part 2)
     <section>
       <article>
         <header>
           <h1>Article Header</h1>
         </header>
         <footer>
           <h2>Article Footer</h2>
         </footer>
       </article>
     </section>


37
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
Anatomy of an HTML5 Page
     HTML code body section (part 3)
           <aside>
             <h3>Aside</h3>
           </aside>
           <footer>
             <h2>Footer</h2>
           </footer>
         </div>
       </body>
     </html>



38
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
Anatomy of an HTML5 Page




39
        Copyright © 2010 - Kaazing Corporation. All rights reserved.
Anatomy of an HTML5 Page




40
        Copyright © 2010 - Kaazing Corporation. All rights reserved.
Anatomy of an HTML5 Page




41
        Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 and CSS Level 3
     • CSS level 2 (W3C)
       o published as a Recommendation1998
       o Candidate Recommendation 2007
     • CSS Level 3 (W3C)
       o Like HTML5, under development
       o Modularized with sub-specifications for easier
         browser uptake (transformation, animation,
         transition)
     • Some CSS Level 3 examples:
       o http://www.zurb.com/playground/
       o http://www.zachstronaut.com/
42
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Forms




43
       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Forms
     • Formerly called Web Forms 2.0
     • Native functionality (no scripting for validation)
       means less coding, for example:
       Regular expression for a valid e-mail address:
      (?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-
      9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-
      \x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-
      \x7f]|\\[\x01-\x09\x0b\x0c\x0e-
      \x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-
      9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-
      9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-
      9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-
      9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-
      \x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-
      \x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])
44
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Forms
     • New form functionality:
       o   Date and color pickers
       o   Search, e-mail, web address input types
       o   Validation
       o   Spin boxes and Sliders
       o   More
     • Backward compatible
     • Features degrade gracefully (unknown input
       types are treated as text-type) input

45
                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Example HTML5 Forms




46
            Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Browser Support for
     Forms
     • Opera 9.6+
     • Chrome (Partial)
     • Safari (Partial)




47
                    Copyright © 2010 - Kaazing Corporation. All rights reserved.
              Demo



48

     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 APIs




49
      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 APIs
     •   Canvas and SVG
     •   Audio and Video
     •   WebSocket
     •   Server-Sent Events
     •   Communication
         o Cross Document Messaging
         o XMLHttpRequest Level 2
     • Web Workers
     • Geolocation
     • Web Storage
50
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5
     Canvas
       &
      SVG



51
      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     About Canvas and SVG
     • Previously possible with Flash, VML,
       Silverlight
     • Very complex to do in JavaScript without
       plugins (for example, rounded corners or
       diagonal lines)
     • Provide native drawing functionality on the
       Web
     • Completely integrated into HTML5 documents
       (part of DOM)
     • Can be styled with CSS
52   • Can be controlled with JavaScript
                    Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Canvas vs. SVG
     • Not a matter of good or bad
     • Both can be used and they can also be
       combined
                   Canvas                                                                  SVG
      Low level                                             High level
      Immediate mode                                        Retained mode
      Fixed size                                            Scalable
      Best for keyboard-based apps                          Best for mouse-based apps
      Animation (no object storage)                         Medium animation
      Pixels                                                XML object model
      No interaction                                        User interaction (hit detection,
                                                            events on the tree)
53
                            Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Canvas
     • HTML5 element and plugin-free 2D drawing
       API that enables you to dynamically generate
       and render
       o   Graphics
       o   Charts
       o   Images
       o   Animation
     • Canvas was originally introduced by Apple to
       be used in Mac OS X WebKit to create
       dashboard widgets

54
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Canvas
     • Canvas is a scriptable bitmap canvas (images
       that are drawn are final and cannot be resized
     • No object tree
     • Can be manipulated with JavaScript and styled
       with CSS
     • 2D Context
     • 3D Context (Web GL)




55
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Example: Canvas Animation




            http://www.canvasdemos.com
56
              Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Browser Support for
     2D Canvas
     •   Chrome 2.0+
     •   Firefox 3.0+ (3.5+)*
     •   Opera 9.6+ (10.5+)*
     •   Safari 3.1+ (4.0+)*

     * Additional support for Canvas Text API



57
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Browser Support for
     3D Canvas (Web GL)
     • Chrome 5.0+
     • Nightly builds of Safari
     • Planned for Firefox 3.7
     * Additional support for Canvas Text API




58
                    Copyright © 2010 - Kaazing Corporation. All rights reserved.
     SVG
     • “Scalable” Vector
       Graphics—not bitmaps




59
                   Copyright © 2010 - Kaazing Corporation. All rights reserved.
     SVG
     • Modularized, XML-based language for describing
       2D vector and mixed vector/raster graphics
     • SVG has been around on the Web since 2002
       (using plugins)
     • SVG provides high fidelity graphics at any zoom
       level
     • Until now mostly used for static content (maps,
       org charts, floor plans, etc.)
     • HTML5 now allows native SVG content in the
       browser (control with JavaScript, style with CSS)
60
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Example SVG Game




        http://ie.microsoft.com/testdrive/Graphics/35SVG--oids/
61
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Browser Support for
     SVG
     The percentages shown are based on
       combined support for all SVG modules
       (for example Basic, Inline, filters):
     • Chrome 2.0+ (58%)
     • Firefox 3.0 (33%) 3.6 (46%)
     • Opera 9.6+ (83%)
     • Safari 3.1 (13%) 3.2 (46%) 4.0 (58%)

     Note: IE 9 Will provide full support
62
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
              Demo



63

     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Audio and Video




64
           Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Audio and Video
     • New HTML5 media elements
       o <audio>
       o <video>
     • Control using Audio/Video API
     • Native support in the browser (embedded
       codecs)
     • Originally, the HTML5 specification was going to
       require codec support…



65
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     AV Containers and Codecs
     • Audio and Video containers:
       o H264 and Ogg
     • Audio and video codecs (algorithms used to
       encode and decode an audio or video stream):
       o Audio: AAC, MP3, Vorbis
       o Video: H264, MP4, Theora
     • Stalemate over patented/free codec inclusion
     • You can add multiple formats per (audio/video)
       element to fallback

66
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
Example:
YouTube HTML5 Channel




      http://www.youtube.com/user/rocpoc
67
            Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Browser Support for
     Audio and Video
     •   Chrome 3.0+ (Ogg + H264)
     •   Firefox 3.5+ (Ogg)
     •   Safari 3.2 (H264)
     •   Opera 10.5 (Ogg)




68
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
              Demo



69

     Copyright © 2010 - Kaazing Corporation. All rights reserved.
          Using
     HTML5 WebSocket




70
         Copyright © 2010 - Kaazing Corporation. All rights reserved.
About HTTP
• HTTP was originally designed for document
  transfer
• HTTP is half-duplex (traffic flows in only one
  direction at a time)
• Hard to achieve real-time,
  bi-directional communication
• Tons of unnecessary HTTP
  header information sent
  with each HTTP request
  and response and added latency

71
                   Copyright © 2010 - Kaazing Corporation. All rights reserved.
Comet and Polling:
Tin-Can Communication
• Comet and (Reverse) Ajax
  o Great toilet cleaners
  o Bad for real-time communication
  o Polling and Long-Polling




72
                 Copyright © 2010 - Kaazing Corporation. All rights reserved.
Example HTTP Request Headers
     POST /gwt/EventService HTTP/1.1
     Host: gpokr.com
     Connection: keep-alive
     User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US)
        AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249.1064 Safari/532.5
     Referer: http://gpokr.com/gwt/7F5E66657B938E2FDE9CD39095A0E9E6.cache.html
     Content-Length: 134
     Origin: http://gpokr.com
     Content-Type: text/plain; charset=utf-8
     Accept: */*
     Accept-Encoding: gzip,deflate,sdch
     Accept-Language: en-US,en;q=0.8
     Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
     Cookie:
        __utmz=247824721.1273102477.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd
        =(none); JSESSIONID=E7AAE0E60B01FB88D1E3799FAD5C62B3;
        __utma=247824721.1247485893.1273102477.1273104838.1273107686.3;
        __utmc=247824721; __utmb=247824721.4.10.127


73
                           Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTTP Response Headers
      200 OK
      Server: Apache-Coyote/1.1
      Expires: Thu, 06 May 2010 01:06:51 GMT
      Content-Type: text/plain;charset=UTF-8
      Content-Length: 303
      Date: Thu, 06 May 2010 01:06:50 GMT


     • Total (unnecessary) HTTP request and
       response header information overhead:
       871 bytes (example)
     • Overhead can be as much as 2000 bytes

74
                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
75
     Copyright © 2010 - Kaazing Corporation. All rights reserved.
WebSocket and Model Trains




76
         Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML5 WebSocket
• W3C API and IETF Protocol
• Full-duplex, text-based socket
• Enables web pages to communicate with a
  remote host
• Traverses firewalls, proxies, and routers
  seamlessly
• Share port with existing HTTP content
  (80/443)
• Cross-domain ready (leverages Cross-Origin
  Resource Sharing)
77
                Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML5 WebSocket
     • Connection established by upgrading from the
       HTTP protocol to the WebSocket protocol
       using the same TCP connection
     • Once upgraded, WebSocket data frames can
       be sent back and forth between the client and
       the server in full-duplex mode
     • Frames can be sent full-duplex, in either
       direction at any the same time
     • Each frame of data:
       o Starts with a 0x00 byte and End with a 0xFF byte
78
       o Contains UTF-8 data in between
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
Dramatic Overhead Reduction




79
         Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Overheard…
      “Reducing kilobytes of data to 2 bytes…and
      reducing latency from 150ms to 50ms is far
      more than marginal. In fact, these two factors
      alone are enough to make WebSocket
      seriously interesting to Google.”
       —Ian Hickson (Google, HTML5 spec lead)




80
                     Copyright © 2010 - Kaazing Corporation. All rights reserved.
Beyond WebSocket
• Once you have WebSocket, you can
  communicate with WebSocket Servers and back-
  end servers and directly with message brokers
• You can extend client-server protocols to the web:
     •   XMPP, Jabber
     •   Pub/Sub (Stomp/AMQP)
     •   Gaming protocols
     •   Any TCP-based protocol
• Browser becomes a
  first-class network
81
  communication citizen
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
Example: WebSocket-
Based Quake II Game Port




82    http://code.google.com/p/quake2-gwt-port
              Copyright © 2010 - Kaazing Corporation. All rights reserved.
Browser Support for
WebSocket
     •   Chrome 4.0+
     •   WebKit Nightly builds
     •   Support planned for Firefox 3.7, Opera
     •   Note: Full HTML4 Emulation available
         o Kaazing WebSocket Gateway (supports
           native WebSocket and provides emulation
           for older browsers)



83
                      Copyright © 2010 - Kaazing Corporation. All rights reserved.
              Demo



84

     Copyright © 2010 - Kaazing Corporation. All rights reserved.
           HTML5
     Server-Sent Events




85
          Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Server-Sent Events
     • Server-Sent Events (SSE) standardizes and
       formalizes how a continuous stream of data
       can be sent from a server to a browser
     • Effectively standardizes Comet and Reverse
       Ajax
     • EventSource API for broadcasting data from
       server to client




86
                    Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Example: News Broadcast




                    http://kaazing.me/
87
             Copyright © 2010 - Kaazing Corporation. All rights reserved.
Browser Support for
Server-Sent Events
     • Opera 9.0+ partial support
     • Development in Firefox Trunk
     • Note: With WebSocket support, SSE
       support is not as important




88
                  Copyright © 2010 - Kaazing Corporation. All rights reserved.
              Demo



89

     Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Communication




90
           Copyright © 2010 - Kaazing Corporation. All rights reserved.
     HTML5 Communication
     HTML5 defines two improved document
       communication features
     • Cross Document Messaging
     • XMLHttpRequest Level 2




91
                   Copyright © 2010 - Kaazing Corporation. All rights reserved.
     Cross Document Messaging
     • Enables secure cross-origin communication
       across iframes, tabs, and windows (using
       origin security)
     • Defines the PostMessage API as a standard
       way to send messages
     • Provides asynchronous message passing
       between JavaScript contexts
     • HTML5 clarifies and refines domain security
       by introducing the concept of an origin

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Origin Concept
     • An origin is a subset of an address used for
       modeling trust relationships on the Web
     • Origins are made up of a scheme, a host,
       and a port—different origin:
       o https://www.example.com
       o http://www.example.com
     • The path is not considered in the origin
       value—same origin:
       o http://www.example.com/index.html
       o http://www.example.com/page2.html
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     PostMessage Architecture




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Browser Support for
Cross Document
Messaging
     •   Chrome 2.0+
     •   Firefox 3.5+
     •   IE 8.0+
     •   Opera 9.6+
     •   Safari 4.0+



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     XMLHttpRequest Level 2
     • XMLHttpRequest Level 2
     • XMLHttpRequest is the API that made Ajax
       possible
     • XMLHttpRequest Level 2 significantly
       enhances XMLHttpRequest
       o Progress events
       o Cross-origin XMLHttpRequest
     • XMLHttpRequest Level 2 allows for cross-
       origin XMLHttpRequests using Cross Origin
       Resource Sharing (CORS)
       http://www.w3.org/TR/access-control/
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     Example XHR2 Architecture




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Browser Support for
XMLHttpRequest Level 2
     • Chrome 2.0+
     • Firefox 3.5+
     • Safari 4.0+




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     HTML5 Web Workers




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      Web Workers
      • Provide background processing capabilities to
        web applications
      • Typically run on separate threads so apps can
        take advantage of multicore CPUs
        o Background number-crunchers
        o Background price updates from server
        o Search queries




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      Example: Prime Numbers




101      http://htmlfive.appspot.com/static/primes-good.html
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Browser Support for
Web Workers
      • Chrome 4.0+
      • Firefox 3.5+
      • Safari 4.0+




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               Demo



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      HTML5 Geolocation




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      HTML5 Geolocation
      • Allows users to share their location for
        location-aware services
         o   Show user's position on map
         o   Tag content (photos/sound/video)
         o   Turn-by-turn navigation
         o   Alert users of nearby points of interest
         o   Social networking
      • Users must be allowed to opt in to
        location sharing


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                           Copyright © 2010 - Kaazing Corporation. All rights reserved.
Location Data
      • Location information consists of a pair of
        latitude and longitude coordinates and
        accuracy information
        o Latitude is the numerical value indicating distance
          north or south of the equator
        o Longitude is the numerical value indicating distance
          east or west of Greenwich, England
        o For Example, Lake Tahoe:
          Latitude: 39.17222, Longitude: -120.13778
      • Coordinates are always returned in decimal
        format
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Additional Location Metadata
      • Depending on the device, additional
        meta data can be provided:
        o   Altitude
        o   altitudeAccuracy
        o   Heading
        o   Speed
      • If this additional metadata is not
        available it will be returned as a
        null value.
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      Location Sources
      • A device can use any of the following
        sources:
        o IP address
        o Coordinate triangulation
        o Global Positioning System (GPS)
        o Wi-Fi with MAC addresses from RFID, Wi-Fi, and
          Bluetooth
        o GSM or CDMA cell phone IDs
        o User defined
      • Each have pros and cons
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      Geolocation Architecture
                                                                             Server that hosts
                                                                             the Geolocation
                                                                               Application




                                                                             External Location
                                                                                  Service




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Example: Privacy Explanation




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      Example: Geolocation App




111     http://maxheapsize.com/static/html5geolocationdemo.html
                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
Map Integration
      • Coordinates are not easy to decipher, easier to
        see on a map
      • Google Maps has built support for HTML5
        Geolocation into its user interface (Show My
        Location button)




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Browser Support for
Geolocation
      •   Firefox 3.5+
      •   Safari 4.0+ on iPhone
      •   Chrome (Dev channel)
      •   Support planned in Opera
      •   Also available in Gears



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               Demo



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      HTML5 Web Storage




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      Web Storage
  • Web Storage a.k.a “cookies on steroids”
  • Three types:
  1. Session Storage Area
  2. Local Storage Area
  3. Web SQL Database




Cookies
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             Session                                    Local                     SQL DB
                   Copyright © 2010 - Kaazing Corporation. All rights reserved.
      Cookies vs. Web Storage
      • Cookies are limited in size
      • Cookies are transferred back and forth on
        every request (bandwidth)
      • Cookies are visible on the network (security)
      • Data leaks (while switching tabs)
      • Web Storage provides a simple API for storing
        values in easily retrievable JavaScript objects
        which persist across page loads


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      Example: Storage Demo




118         http://html5demos.com/storage
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Browser Support for
Web Storage
      •   Chrome 3.0+
      •   Firefox 3.0+
      •   Safari 4.0+
      •   Opera 10.5+
      •   IE 8.0+




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Browser Support for
Web SQL Database
      •   Chrome 3.0+
      •   Safari 3.2+
      •   Opera 10.5+
      •   Note: Web SQL Database is based on
          SQLite and listed as stalled in the WHATWG
          spec. Indexed Database (a.k.a WebSimpleDB)
          is simpler and with no specific SQL database
          version, but not implemented yet.
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               Demo



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      Other HTML5 Features




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      Offline Web Applications




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      Offline Web Applications
      • Offline Web Applications
        o HTML5 allows detection of online/offline mode
        o Users can continue to interact with web
          applications and documents when their network
          connection is unavailable
        o Example: Gmail (Moving away from Gears)
      • Use a cache manifest file with details about
        files to be cached
      • Browsers cache data is in the application
        cache

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Browser Support for
Offline Web Applications
      • Chrome 4.0+
      • Firefox 3.5+
      • Safari 4.0+




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                       Copyright © 2010 - Kaazing Corporation. All rights reserved.
      Other HTML5 Features
      • Drag and Drop Mechanism,
        o Currently only in Firefox 3.5+
      • History
        o Includes nested browsing contexts
        o Not widely supported yet
      • ContentEditable
        o Editable elements
        o HTML5 provides a formalization of what is already
          implemented in HTML4 (all browsers)


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                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
      Developing HTML5
        Applications




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      HTML5 Application Assets
      • Typical HTML5 Application
        o   HTML
        o   CSS
        o   JavaScript
        o   Images
        o   Manifest (for caching offline applications)




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                          Copyright © 2010 - Kaazing Corporation. All rights reserved.
      HTML5 IDEs and Tools
 • Currently limited HTML5 IDE support
       o SEEdit (Text editor)
 • HTML5 simplicity reduces work
 • Advanced browser development tools allow for
   “semi-rapid” development and live coding
       o Safari Web Inspector
       o Chrome Developer console
       o Firefox Firebug Add-on and Opera Firefly
 • more IDE support as specification solidifies
 • In the meantime, browser detection and feature
   emulation is growing
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                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
      HTML5 Helper Tools
      • modernizr
        o Small, simple JavaScript library that checks
          support for HTML5 and CSS3 features
        o Moves away from user-agent sniffing and uses
          feature detection instead
        o http://www.modernizr.com/
      • html5shiv
        o Creates the new HTML5 DOM elements in Internet
          Explorer so that styles can be applied to them
        o http://code.google.com/p/html5shiv/

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      HTML5 Feature Emulation
      • Google Gears
      • Flash plugins
      • JavaScript-based emulations
      • Exporercanvas—Canvas emulation for
        Internet Explorer:
        http://code.google.com/p/explorercanvas/
      • SVG Web Toolkit—SVG in Internet Explorer:
        http://code.google.com/p/svgweb/
      • WebSocket emulation for HTML4 browsers:
        Kaazing WebSocket Gateway
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      Moving Away From Flash
      • Reasons: iPad does not support Flash
      • Flash content can in some cases be
        converted
      • Various HTML5 Canvas converters:
        o Flash CS5 Export to Canvas:
          http://www.9to5mac.com/Flash-html5-canvas-
          35409730
        o Opacity: http://likethought.com/opacity/
        o Illustrator to Canvas:
          http://webdev.stephband.info/canvas/convert.html

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      Testing and Deploying
      • Testing HTML5 Applications is not much
        different from HTML4 testing
      • Check for feature support in target browsers
      • Recent browsers provide better debugging
        capabilities (extensive debug consoles)
        o Firebug
        o Webkit-based inspector
        o Dragonfly
      • Additional QA tools
        o Dynatrace (performance)
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        o Wireshark (wire traffic inspection)
                        Copyright © 2010 - Kaazing Corporation. All rights reserved.
      Mobile HTML5 Applications
      • HTML5 applications served in a browser,
        therefore essentially not any different
      • Feature support may be different for mobile
        devices (for example, Geolocation on Safari
        Desktop vs. iPhone)
      • Widgets and iAd developments




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      What’s Next?




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      Microsoft IE and HTML5
• IE8 implementations for some parts of HTML5
• Recently joined HTML5 graphics working group
  (12/09)
• “Doubling down” in IE9 (9th time’s a charm)
       o   Audio
       o   Video
       o   SVG
       o   CSS3
       o   2D Acceleration
       o   Does not run on XP
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                         Copyright © 2010 - Kaazing Corporation. All rights reserved.
      What’s Next?
      • Candidate Recommendation 2012
      • Proposed Recommendation 2022
      • There are already various features on the
        roadmap that will not make it into HTML5
        o device element
        o ping attribute
      • Maybe just “HTML” (not version 6)?




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138
      Copyright © 2010 - Kaazing Corporation. All rights reserved.
 Resources
• “When Can I Use?” a website with up-to-date
  HTML5 Feature support matrix:
   http://a.deveria.com/caniuse
• WHATWG HTML5 Spec
      o http://www.whatwg.org/specs/web-apps/current-work/
• W3C HTML5 Spec
      o http://dev.w3.org/html5/spec/Overview.html




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      E-mail: peter.lubbers@kaazing.com
      Twitter: @peterlubbers
140
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      User Group Special!

                                                   HTML5ROCKS




           10% Off Any HTML5 Training
      With Coupon Code HTML5ROCKS
      http://tech.kaazing.com/training/index.html
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               Copyright © 2010 Kaazing Corporation, All rights reserved.
      All materials, including labs and other handouts are property of Kaazing Corporation. Except when
         expressly permitted by Kaazing Corporation, you may not copy, reproduce, publish, or display any
                              part of this training material, in any form, or by any means.




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