los angeles html5 user group meeting ask the expert session
DESCRIPTION
Slides from the HTML5 User Group Meeting in Los Angeles on 15 December 2010 (http://www.meetup.com/HTML5-CSS3-LA/)TRANSCRIPT
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Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML5 Overview and Q&A
By Peter Lubbers, KaazingLos Angeles HTML5 User Group
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about:peterlubbers
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Agenda• A little bit about HTML5• Overview of HTML5 Features• Q&A
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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
“If you want to do something universal, there is no question, the world is going HTML5. That is clear...The world is just pushing down this HTML5 path and so are we.
—Steve Ballmer, CEO Microsoft
"I had no idea there was so much HTML5 already in play"—Tim O'Reilly
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HTML5 Vision and Design Principles
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Compatibility• Pave the cow paths• Degrade gracefully• Research common
behavior; solve realproblems
• Support existing content
• Evolution not revolution• Don't reinvent the wheel (or at least make a
better one!)Copyright © 2010 - Kaazing Corporation. All rights reserved.
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Plugin-Free Paradigm• HTML5 provides native support for many
features that were only possible with plugins or complex hacks (drawing API, sockets)
• Problems with plugins:o Plugins may not be installedo Plugins can be disabled or blocked (iPad does not
ship with Flash plugin)o Plugins are a separate attack vectoro Plugins are difficult to integrate with the rest of an
HTML document (plugin boundaries, clipping, and transparency issues)
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Simple is Better• Simplify wherever possible• Examples:
o Native browser ability instead of complex JavaScript code
o New doctypeo Character seto HTML5 APIs
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Simplified Doctype
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
HTML5
<!DOCTYPE html>
HTML4/XHTML• HTML 4.01 Strict• HTML 4.01 Transitional• HTML 4.01 Frameset• XHTML 1.0 Strict• XHTML 1.0 Transitional• XHTML 1.0 Frameset• XHTML 1.1
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Simplified Character Set
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HTML4
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
HTML5
<meta charset=utf-8>
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Minimal HTML5 Page
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HTML5
<!DOCTYPE html> <meta charset=utf-8> <title>HTML5</title> <h1>HTML5!</h1>
DOM
70 characters!
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HTML5 Readiness• HTML5 is still under development• Lots of support already
o Browser support matrix: http://caniuse.com o Browser test: http://html5test.com o IE support coming
"HTML5 should not be considered as a whole. You should cherry-pick the technology that suits the solution to your problem.”—Remy Sharp (Co-Author Introducing HTML5)
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Microsoft at Disruptive Code, Stockholm, 2010 Copyright © 2010 - Kaazing Corporation. All rights reserved.
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Useful HTML5 Resources• 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 insteadhttp://www.modernizr.com/
• html5shivo Creates the new HTML5 DOM elements in Internet
Explorer so that styles can be applied to themhttp://code.google.com/p/html5shiv/
• html5boilerplateo http://html5boilerplate.com
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HTML5 Validation• Experimental at this stage:
o http://html5.validator.nu/o http://validator.w3.org/
• Firefox HTML5 modeo html5.enable true
• HTML5 outline algorithm test pageo http://gsnedders.html5.org/outliner/
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HTML5 Features• New Markup• Canvas• Audio and Video• Geolocation• Web Workers• Web Storage• X-Doc Messaging• XMLHttpRequest Level 2• Server-Sent Events• WebSocket
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• Microformats• Math ML• SVG• Forms• Offline Web Apps• Drag and Drop
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<nav>
<header>
<canvas>
<ruby>
<article>
<video>
<audio>
<command>
<hgroup>
<dialog><details><datalist>
<footer><figure><embed>
<keygen> <mark>
<output>
<meter>
<section>
<source>
New HTML5 Tags
<aside>
<rp><rt>
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http://dev.w3.org/html5/markup/elements.html#elements
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<s> <strike>
<big>
<acronym>
<basefont>
<center>
<frame>
<font><dir>
<noframes>
<frameset>
<tt>
<u>
Removed Tags in HTML5
<applet>
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HTML5 Forms
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<form method="post" enctype="application/x-www-form-urlencoded" action="http://localhost:9999/signup.cgi"> <p><label for="runnername">Runner:</label> <input id="runnername"name="runnername" type="text" placeholder="First and last name" required></p> <p><label for="phone">Tel #:</label> <input id="phone" name="phone" type="tel" placeholder="(xxx) xxx-xxx" required></p>
<p><label for="dob">DOB:</label> <input id="dob" name="dob" type="date" placeholder="MM/DD/YYYY"></p> Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML
Example Form
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Offline Web Applications
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CACHE MANIFEST# manifest version 1.0.1 # Files to cacheindex.htmlcache.htmlhtml5.cssimage1.jpgimg/foo.gifhttp://www.example.com/styles.css
# Use from network if availableNETWORK:network.html
# Fallback contentFALLBACK:/ fallback.html
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Manifest File
The Manifest File
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<!DOCTYPE html><html manifest="offline.manifest"> <head> <title>HTML5 Application Cache</title>
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HTML
Using a Manifest File in HTML• Reference the manifest file:
o <name>.manifest – it must match the name of the manifest file
o Add as attribute to HTML element
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HTML5 SVGand
Canvas
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HTML
5
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Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML
<!--Basic SVG example, see http://www.alistapart.com/articles/get-ready-for-html-5/-->
<!DOCTYPE html><title>SVG</title><h1>SVG</h1>
<svg xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 200 100" width="200px" height="100px">
Basic SVG Element
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Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML
<circle cx="50" cy="50" r="30" style="stroke:none; fill:#ff0000;"/>
<g transform="translate(100, 20) scale(1.65)"> <polygon points="36 25, 25 36, 11 36, 0 25, 0 11, 11 0, 25 0, 36 11" style="stroke:none; fill:#0000ff;" /></g>
<rect x="60" y="20" height="60" width="60" style="stroke:none; fill:#00ff00; fill-opacity: 0.5;" /> </svg>
Basic SVG Element
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Copyright © 2010 - Kaazing Corporation. All rights reserved.
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Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML
<!--Basic canvas element-><canvas></canvas>
<!—Sized canvas element-><canvas height="200" width="200"></canvas>
<!--canvas element with fallback text-><canvas> Update your browser to enjoy canvas!</canvas>
Basic Canvas Element
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Example: 3D Canvas-Based Quake II Game Port
http://code.google.com/p/quake2-gwt-port Copyright © 2010 - Kaazing Corporation. All rights reserved.
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HTML5 Audio and Video
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Copyright © 2010 - Kaazing Corporation. All rights reserved.
HTML
//Basic Video<video controls src="rocpoc.mp4"> A movie by Rocky Lubbers</video>
// Add some attributes<video id="movies" controls preload="auto" width="400px" height="300px" poster="lake-tahoe.JPG“ > <source src="rocpoc.mp4"> <source src="rocpoc.ogv"> A movie by Rocky Lubbers</video>
The Video Element
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HTML5 Geolocation
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//One shot requestvoid getCurrentPosition( in PositionCallback successCallback, in optional PositionErrorCallback errorCallback, in optional PositionOptions options);
//Access user's positionnavigator.geolocation.getCurrentPosition( updateLocation, handleLocationError);
JavaScript
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Position Request
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//Show coordinates on a Google Map// Create a Google Map//See Google API for more detailvar map = new google.maps.Map2(document.getElementById("map")); function updateLocation(position) { //pass the position to the Google Map and center it map.setCenter(new google.maps.LatLng( position.coords.latitude, position.coords.longitude, 13); // zoom level} navigator.geolocation.getCurrentPosition( updateLocation, handleLocationError);
JavaScript
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Google Map Integration
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HTML5 Web Workers
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//Check if Web Workers are supportedif (typeof(Worker) !== "undefined") { document.getElementById("support").innerHTML = "Your browser supports HTML5 Web Workers";}
//Create a new worker//The URL for the JavaScript file can be a relative or //absolute URL with the same origin //(the same scheme, host, and port) as the main pageworker = new Worker("echoWorker.js");
//to load additional JavaScriptimportScripts("helper.js, "anotherHelper.js");
JavaScript
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Web Workers
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HTML5 Web and Database Storage
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HTML5 Web Storage
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Cookies Session Local Database
• Web Storage a.k.a "cookies on steroids"• Two types:
1. Key Value Storage(Session and Local Storage)
2. Database Storage
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//Set a valuewindow.sessionStorage.setItem('myFirstKey', 'myFirstValue');
//Get a valuealert(window.sessionStorage.getItem('myFirstKey'));
JavaScript
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Setting and Retrieving Values
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Inspecting Browser Storage
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// open a database by namevar db = openDatabase('db', '1.0', 'my first database', 2 * 1024 * 1024);
//Select *db.transaction(function (tx) { tx.executeSql('SELECT * from racers',[], function(tx, result)}
//Create Tabledb.transaction(function (tx) { tx.executeSql('CREATE TABLE IF NOT EXISTS racers (id integer primary key autoincrement, name)');}
JavaScript
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Web SQL Database
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HTML5 WebSocket
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Polling vs. WebSocket
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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)
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Other HTML5 Features• Cross Document Messaging• XHR Level 2 • Drag and Drop Mechanism
o Currently only in Firefox 3.5+
• Historyo Includes nested browsing contextso Not widely supported yet
• ContentEditable o Editable elementso HTML5 provides a formalization of what is already
implemented in HTML4 (all browsers)Copyright © 2010 - Kaazing Corporation. All rights reserved.
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Questions and Answers
This work is licensed under a Creative Commons Attribution 3.0 License.
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THANKS
!E-mail: [email protected]
Twitter: @peterlubbers
LinkedIN: Peter Lubbers
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Learn More…• HTML5 User Groups:
o San Francisco: http://www.sfhtml5.org/o New York: http://www.meetup.com/web-86/
• Apress book: Pro HTML5 Programmingo (Peter Lubbers, Brian Albers, & Frank Salim)
http://www.prohtml5.com/
• HTML5 WebSocket:o http://www.websockets.org
• Kaazing Corporation–Training:o E-mail us: [email protected] Web site: http://tech.kaazing.com/training/
This work is licensed under a Creative Commons Attribution 3.0 License.
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Resources• "When Can I Use?" a website with up-to-date
HTML5 Feature support matrix:o http://caniuse.com
• Browser HTML5 Support Testo www.html5test.com
• HTML5 Boilerplateo www.html5boilerplate.com
• WHATWG HTML5 Speco http://www.whatwg.org/specs/web-apps/current-work/
• W3C HTML5 Speco http://dev.w3.org/html5/spec/Overview.html
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Contact UsQuestions about the course or need more training?• Email: [email protected]• Website: http://tech.kaazing.com/training/
Meet (us and) other HTML5 users in:• San Francisco: http://www.sfhtml5.org/• Silicon Valley:
http://www.meetup.com/Silicon-Valley-HTML5-User-Group/
• New York: http://www.meetup.com/NY-HTML5-User-Group/
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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.
Copyright © 2010 - Kaazing Corporation. All rights reserved.