Introduction to html 5

Introduction to HTML 5.0
Part 1 - Markup
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HTML 5 - WHAT IS IT AND HOW DID
IT GET STARTED?
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Intro
The hottest technology!
More than just a
presentation markup language
Mobile
Google
Apple
MS WinRT
Mozilla
Facebook
Cross platform

Intro
• HTML 5 - The new standard for HTML
Moving to HTML 5.0 >> What Is It And How Did It Get Started?
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HTML 2
November 1995
HTML 4.01
December 1999
1995 20091999
XHTML 1.1
May 2001
2001
W3C
XHTML 2
WHATWG
Web Forms API
???
W3C:
HTML OUT
XML IN
Definition
December 2012
2012
HTML 5 1st Final Draft
October 2009
WHATWG
2004
2004 2006

Intro
• Plan 2014
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Intro
“
Require at least two browsers to completely
pass HTML 5 test suites
”
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Intro
• HTML 5 rules:
– New features should be based on HTML, CSS,
DOM, and JavaScript
– Reduce the need for external RIA plugins (like
Flash*, Silverlight etc.)
– Better error handling (backwards compatibility)
– More markup tags to replace scripting
– HTML5 should be device independent
– Dev. process should be visible to the public (ML)
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What’s New in HTML 5?
• Less header code
• More semantic HTML elements
• New / obsolete HTML elements & attributes
• Form validation
• Deprecated HTML elements & attributes
• Cross device
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• New APIs:
– Integrated APIs:
• Video & Audio
• Inline Editing
• Offline Application
• History API
• Web Protocol
• Drag & Drop
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Relies (heavily) on JavaScript
– Associated APIs:
• Geolocation
• Local Storage
• Web Workers
• Web Sockets
• Messaging
http://ie.microsoft.com/testdrive/

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GETTING STARTED WITH HTML5
Moving to HTML 5.0
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HTML5 Page Structure
Moving to HTML 5.0 >> Getting Started With HTML5
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• HTML 4 page structure 

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!
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!
!
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• HTML 5 page structure 
NppPlates

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• Migrating from HTML 4 to HTML 5
1. Change the Doctype
2. Shorten HTML tag
3. Change the charset meta tag
4. Shorten SCRIPT & STYLE tags
5. Shorten LINK tags
6. Convert DIVs to semantic elements (not all of them)
7. Use new elements / attributes
8. Remove obsolete elements & attributes
9. Fix CSS rules

Semantic Elements
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Semantic elements are Not design elements!
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Semantic Elements
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• Why is it good for?
– Code Standardization
– Accessibility
– SEO (Search Engine Optimization)
&
– Semantic Web 3.0
Easy to consume

Semantic Elements
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Semantic Elements
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• More semantic HTML tags
– Results: <output name="result"></output>
– Progress bar: <progress id="p" max=100>0%</progress>
– Measurement gauge: <meter value=6 max=8>6 blocks (out of 8)</meter>
– Details & summary: <details><summary>…</summary></details>
– Images & captions: <figure><img src=“…” /><figcaption>title</figcaption></figure>
– Dates & times: <time pubdate datetime="2012-06-10T14:28-08:00"></time>
– Menus & commands: <menu type="toolbar"><command type=“radio” /></menu>
– Highlights: Task requires 3 programmers.

Semantic Elements
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semanticElements.html

Semantic Elements
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• DOs & DONTs
1. Don’t use section as a wrapper for styling
2. Only use header and hgroup when they’re
required
3. Don’t wrap all lists of links in nav
4. Not every image is a figure
5. Figure can be more than an image

Semantic Elements
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• The role of DIV element
– Only use section and article elements when
sectioning content is appropriate
– Only use the aside for related content
– Headers and footers are for grouping heading or
footer content
– nav elements should not be used for every
navigation grouping
– DIVs can be used to group related content

Error Handling
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• Spec defines what browsers should do while
• Processing well-formed markup
• Processing badly formed markup! new! new! new!
• Not that interesting if you’re writing valid
• An HTML5 (text/html) browser will be flexible
in handling incorrect syntax
– designed so that old browsers can safely
ignore new HTML5 constructs
– browsers will produce the same result in the case
of incorrect syntax

Page & Form Elements and Attributes
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forms.html

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• New elements & attributes (highlights)
– Input types
• tel – phone numbers
• search – search bars
• email – email addresses
• range – range of numbers
• color – color picker
• date – picker (datetime TZ, date-local, week, time, month)
• time – time picker
• file – upload multiple files
• url - links

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– Input types
Unsupported browsers default to text. Implementation is different between supported browsers!

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– Attributes
• placeholder – sets place holder string for input elements
• data-* – custom element attributes
• autofocus – focus control during page load
• autocomplete (on / off) – stores input for future use
• multiple – allows multiple values in file / email inputs
• list – offers predefined values but accepts free text
• form – allows placing an input outside the form

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• Obsolete tags & attributes (highlight)
– Presentation elements such as , <center>,
<blink>, <dir>, <basefont>, <big>, <strike>
– Presentation attributes including align, border,
hspace, vspace
– <frame>, <frameset>, <layer>, <ilayer>
– <applet>
– <marquee>, <bgsound>, <noscript>

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• Form validation (1 of 4)
– required – valueMissing
– type – typeMismatch
– pattern – patternMismatch
– maxLength – tooLong
– min – rangeUnderflow
– max – rangeOverflow
– step – stepMismatch
– setCustomValidity(message) – customError

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– Custom validation is possible by JS checking
– Turning form validation off
• novalidate form attribute
• Empty value formonvalidate submit button attribute
forms.html

– Customized validation error messages
• Error message can be modified using the invalid input
event handler:
• Appearance can be modified just a little (:invalid, :required)
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– JavaScript to the rescue:
• elem.checkValidity (method, bool)
• elem.willValidate (attribute, bool)
– The control is an input, select, or textarea
– The control is not disabled and not readonly
– The control is not of type hidden, button, reset, or submit
• elem.validity.valid (attribute, bool)
• elem.validationMessage (attribute, string)
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validatity.html

Part 2 – APIs
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NEW APIS
Advanced Client Side Programming
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• Empowering web applications:
– Dozens of WGs working on new APIs
– We don’t need any plugin – HTML 5 is enough!
– As HTML 5 itself, not all APIs are final
Intro to HTML 5 APIs
Moving to HTML 5.0 >> New APIs
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Intro to HTML 5 APIs
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• Key features
– Web pages container for 2D graphics
– Pixel-by-pixel rendering resolution dependent
– Manipulated via scripting (Javascript)
– Supported in IE 9+ & all other popular browsers
– Once drawn, it is “forgotten” by the browser
Canvas Element
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• Canvas basic template
Canvas Element
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canvasBasicTemplate.html

• Canvas reference surface
• Drawing rectangles
fillRect(x, y, width, height);
strokeRect(x, y, width, height);
clearRect(x, y, width, height);
Canvas Element
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Set colors:
fillStyle = “color” || “rgba()”
strokeStyle = “color” || “rgba()”
canvasShapes.html
Line style:
lineWidth = 1.0
lineCap = “butt” || “round” ||”square”
lineJoin = “round” || “bevel” ||”miter”

• Drawing stuff
– Rectangles
– Shapes
– Arcs
– Quadratic & Bezier curves
– Text
– Images
Canvas Element
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canvasShapes.html

• Manipulating images
– Get the image data using
getImageData(x, y, width, height)
– Extract the array out of the image data
– Modify the image data array imageData.data
– Re-draw the modified image data using
putImageData(imageData, x, y)
Canvas Element
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The getImageData() method requires that the image is hosted on a web server
with the same domain as the code executing it
canvasShapes.html http://localhost:82/demo/

• Styling
– Global alpha
– Shadows
– Gradient
• Linear, Radial, Pattern
Canvas Element
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• Canvas composition
Canvas Element
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• Canvas transformation
– Translate
– Rotate
– Scale
– Transform
Canvas Element
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• Canvas animation
– Determine optimal FPS
– Draw a shape on canvas
– Clear canvas
– Redraw a shape on canvas
Canvas Element
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Canvas Element
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• Key features
– Web pages container for 2D graphics
– Vector graphics - resolution independent
– Manipulated via scripting & CSS
– Supported in IE 9+ & all other popular browsers
SVG Element in a Nutshell
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• SVG vs. Canvas comparison
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Canvas SVG
Pixel based (similar to image element) Vector based (similar to Flash technology)
Single HTML element (the whole canvas) Multiple graphical elements which become
part of the Document Object Model (DOM)
Modified through script only Modified through script and CSS
API does NOT support accessibility SVG markup and object model directly
supports accessibility
Resolution dependent Resolution independent
No API for animation Good support for animations via scripting &
CSS animations

• So… SVG or Canvas?
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Video & Audio Elements
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Text-only Web
Midi & GIFs
MP3
Real Player &
Windows Media
Bandwidth
Flash
Plugins…Plugins…Plugins…Plugins…

• The history of HTML 5 video element
– You had to use the ugly <object> element in order
to include videos
• You had to add the <embed> element, too
• The right plugin must be installed in order to play the file
• Plugins are the cause of instability issues
• Poor display when layout overlaps the plugin area
• The media data is inaccessible (dom)
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• 1st class citizens – no plugins needed!
• Full access to file’s data
• Multiple codecs supported & integrated fallback
plan to support all major browsers:
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• Video formats
• Audio formats

• Codecs & old browsers support
– we can add links to other formats of the same file,
so that it can be played in any browser, using the
source tag
– We can add to the source tags the object element,
in order to support old browsers as well
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• Samples
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video.html
audio.html
Video & canvas Adding subtitles to video file

Inline Editing
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• contenteditable
– Attr, turns an element into an editable area
– Can be applied to almost any element
– No need to build several views for view & editing
– Can be applied even to <style> element
– Save / undo changes can be done by JavaScript
contentEditable.html

• Introduction
– More people are experiencing the web in motion
– This increase the likelihood of connectivity issues
– Offline API allows creation of websites that give
your users a continuous experience
• App Cache: HTML, CSS, JS & images
• Storage: local/sessionStorage, Web SQL
Offline
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• Benefits
– Offline browsing - users can navigate your full site
when they're offline
– Speed - cached resources are local, and therefore
load faster.
– Reduced server load - browser will only download
resources from the server that have changed.
Offline
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• Going offline (1 of 2)
– Manifest – simple text file which specifies the files
that browser should store in cache
• A manifest can have three distinct sections:
– CACHE – listed files will be explicitly cached after they're
downloaded for the first time
– NETWORK - listed files require a connection to the server and
hence all requests to these resources bypass the cache
– FALLBACK - specifies fallback pages if a resource is
inaccessible (1st URI is the resource, the 2nd is the fallback)
Offline
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Your web server must have the extension .manifest
MIME TYPE: text/cache-manifest

Offline
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First line (mandatory)
First section is CACHE
(default)
Allows URL paths
Use # to comment

• Going offline (2 of 2)
– To tell the browser to look for a manifest, add the
manifest attribute to the html element
Offline
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<!DOCTYPE html>
<html lang="en" manifest="/offline.manifest">

• How it really works? (1 of 2)
Offline
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Browser
• Requests “http://www.mysite.com/index.html
Server
• Returns index.html
Browser
• Parses index.html and requests all assets in page, including the manifest
Server
• Returns all requested assets
Browser
• Processes the manifest and requests all assets ONCE AGAIN
Server
• Returns all requested assets
Browser
• Application cache has updated, triggers an event stating so

• How it really works? (2 of 2)
Offline
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Browser
• Re-requests “http://www.mysite.com/index.html
Browser
• Detect that it has local cache for this page and serves it locally
Browser
• Parses index.html and requests all assets in local cache
Browser
• Requests the manifest file from the server
Server
• Returns 304 code notifying the browser that it hasn’t changed

• Introduction
– History API allows developer to browse and
manipulate the URL collection user has visited
– It is not a new concept. Existing methods:
// Check the length of the history stack
console.log(history.length);
// Send the user agent forward
console.log(history.forward());
// Send the user agent back
console.log(history.back());
// Send the user agent back (negative) or forward (positive)
// by a given number of items
console.log(history.go(-3));
History API
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• The problem
– URL identifies a unique resource
• You can directly link to it
• You can bookmark it
• You can share it
– Dynamic Ajax web applications (SPA architecture)
refresh page fragments w/o URL change
• URL change will refresh the whole page
History API
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• The solution
– Push / pop history items to the browser
– Attach data to each entry
– Manipulate URL in browser’s location bar w/o refresh
– Listen to browser’s Back button
History API
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Essential for SPA!

• Introduction
– There are several non-http protocols, such as the
mailto: protocol
• Web authors can use a mailto: link when they want
to provide a convenient way for users to send an email
• browser should launch the default desktop application
for handling email
• Web-based protocol handlers allow web-based
applications to participate in the process too
Web-Based Protocol Handlers
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• Introduction
– Same idea as the protocol handler, just for content
(MIME types)
– The code below will open all *.playtech links using
pt.html web page (handler)
Web-Based Content Handlers
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• Introduction
– An old concept which was first introduced in IE
– Adopted by all other browsers
– Allows to drag items and drop them anywhere
Drag & Drop
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Magnetic Poetry
8p

• Key features
– Get the geographical position of a user (appx)
– Requires user’s approval (safety)
– Great for providing location based services
– Supported by IE 9+, Firefox, Safai, Chrome, Opera
Geolocation
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• How does it work
– IP based: old-fashion, inaccurate & unreliable but
always available
– GPS: Very accurate but is only available on open
spaces
– Wi-Fi based: Very accurate and available even in
buildings but requires several Wi-Fi spots
– Cellphone: Location is set by its distance from
cellular antenas
Geolocation
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• Introduction
– Storing data associated with an application is
fundamental in nearly all applications
– Up until now
• Store on the server side (database server)
– Extra resources
– Split between locations
• Store in cookies
– Very limited
Data Storage
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• localStorage & sessionStorage (1 of 6)
– Key features
• Store string typed key-value pairs on client side
• Unlike cookies, data is not sent to server
• ~5MB per domain (4KB per cookie)
• sessionStorage: short-term, tab (window)
• localStorage: long-term, browser
• Doesn’t work in private-mode
• Don’t use for sensitive data store!
• Supported in IE 8+ & all other popular browsers
Web Storage
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8+
webStorage.html

• Introduction
– Working with web database
• There are several proposals for we database
implementation:
– WebSQL DB (Deprecated)
» A real relational database, based on SQLite and uses
» Supported in Chrome, Safari & Opera
– IndexDB (Settled down few months ago)
» SQL implementation independent
» Supported in FF, Chrome & IE 10
Web SQL
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webSQL.html
indexDB.html

• Introduction
– API for posting messages between domains
– Not restricted by the same origin policy
Messaging
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Messaging API
Web Sockets API Web Workers API

• The problem
– When executing scripts in an HTML page, the page
becomes unresponsive until the script is finished
– This is a major bottleneck preventing applications
from being ported to client-side JavaScript
Web Workers
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• Introduction
– A JavaScript that runs in the background (isolated thread)
– Runs independently of other scripts – no affect on UI!
– The code needs to be contained in a separate file
– Workers have the ability to spawn child workers
– Workers must follow the same-origin policy
– There are two kinds of web workers:
• Dedicated Workers
• Shared Workers
Web Workers
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Web Workers
Workers HAVE access to
• The navigator object
• The location object (R)
• XMLHttpRequest
• setTimeout()/setInterval()
• The Application Cache
• Importing external scripts
using importScripts()
• Spawning other workers
• All core JS function
• Web sockets
Workers do NOT have access to
• The DOM (not thread-safe)
• The window object
• The document object
• The parent object
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webWorkers.html

• Introduction
– Web sockets give a full duplex connection
between server and client
– Connection is real time, constantly open 
messages are sent immediately
– Crucial for real-time applications
– Polling  Pushing
Reactive  Proactive
Web Sockets
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Web Sockets
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Very low latency in comparison to XMLHttpRequest
+ tiny data packets (no headers required)

• Stream API
• Orientation
• Crypto
• WebNotifications
• requestAnimationFrame
• Halt on page visibility
• Contacts
Additional APIs
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And many more…!
• CSS 3
• Vibration
• WebCL
• SVG
• Web Audio

BROWSERS COMPATIBILITY &
SUPPORT
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• Work still in progress
– None of the browsers support 100% HTML 5
– Many APIs, elements & attributes are still drafts
Current Status
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http://beta.html5test.com

• Define the browsers you wish to support
• Check browsers’ support status occasionally
(HTML5Test, FindMeByIP, ringmark, CanIUse…)
• Choose features according to the LCD rule
• Consider using polyfills – HTML5PLEASE,
HTML5 Cross Browser Polyfills
• Don’t ignore your old-fashioned users – Always
provide fallback!
• Use the Modernizr & yepnope
Using HTML 5 Wisely
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HTML 5
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Appendix: Flash vs. HTML5
Use HTML5
• Business application
• Accessibility websites
• SEO
• General websites
• Branded microsites
• Play public video files
Use Flash
• Advanced 3D gaming
• Content that requires DRM
• Display complex animations
• High-end entertainment
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Appendix: Media Queries
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• Display optimization per device
– specifies what media/device the element is
optimized for
– Supported in all major browsers
– This attribute can accept several values
<element media=“value”>

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• Operators
• Devices

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• Values (1 of 2)

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• Values (2 of 2)

Appendix: Same Origin Policy
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Source page URL: http://store.company.com/dir/page.html

• http://www.w3.org
• http://html5doctor.com
• http://html5demos.com
• https://developer.mozilla.org
• http://blogs.msdn.com/b/dorischen
• http://www.html5rocks.com
• http://www.w3schools.com
• http://diveintohtml5.info
Appendix: Resources
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Introduction to html 5