HTML5

Report
HTML5 (HYPER TEXT MARKUP
LANGUAGE)
Lab 223
潘建廷 [email protected]
何偉聖 [email protected]
INTRODUCE
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Today, some elements in HTML 4.01 (1999)are
obsolete, never used, or not used the way they
were intended to. These elements are deleted or
re-written in HTML5.
HTML5 is the next generation of HTML.
HTML5 will be the new standard for HTML,
XHTML, and the HTML DOM.
HTML5 is still a work in progress. However,
most modern browsers have some HTML5
support.
GOALS
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Document real-world browser behaviour
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Document and standardise useful extensions
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Develop practical new features
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Ensure backwards compatibility
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Define robust error handling
DESIGN PRINCIPLES
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Foundation of Design and Development
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Organised into 3 Categories
Compatibility
 Utility
 Interoperability
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DESIGN PRINCIPLES: COMPATIBILITY
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Support Existing Content
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Degrade Gracefully
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Don't Reinvent the Wheel
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Pave the Cow paths
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Evolution, not Revolution
DESIGN PRINCIPLES: UTILITY
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Solve Real Problems
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Priority of Constituencies
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Media Independence
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Universal Access
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Support World Languages
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Secure By Design
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Separation of Concerns
DESIGN PRINCIPLES: INTEROPERABILITY
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Well-Defined Behaviour
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Avoid Needless Complexity
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Handle Errors
BENEFITS OF HTML
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Backwards compatible with legacy UAs
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Author familiarity
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Lenient and forgiving syntax
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Convenient shorthand syntax
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Can omit some tags and attribute values
BENEFITS OF XHTML
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Strict XML Syntax
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Integrate directly with other XML vocabularies
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SVG, MathML
Use XML Processing
DOCUMENT REPRESENTATIONS
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HTML5 will be the new standard for HTML,
XHTML, and the HTML DOM.
HTML5 WERE ESTABLISHED
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New features should be based on HTML, CSS, DOM,
and JavaScript
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Reduce the need for external plugins (like Flash)
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Better error handling
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More markup to replace scripting
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HTML5 should be device independent
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The development process should be visible to the
public
VIDEO
•Ogg = Ogg files with Theora video codec and Vorbis audio codec
•WebM = WebM files with VP8 video codec and Vorbis audio codec
•MPEG4 = MPEG 4 files with H.264 video codec and AAC audio
codec
VIDEO
H.264 SUPPORT IN THE “BIG-5”
VIDEO --VIA HTML5
Example
•The video element allows multiple source elements. Source elements can
link to different video files.
• The browser will use the first recognized format
VIDEO – UI CONTROLS
AUDIO
• Until now, there has never been a standard for playing audio on a web page.
• Today, most audio are played through a plugin (like flash). However, not all
browsers have the same plugins.
• HTML5 specifies a standard way to include audio, with the audio element.
• The audio element can play sound files, or an audio stream.
WEB STORAGE
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HTML5 offers two new objects for storing data on
the client:
localStorage - stores data with no time limit
 sessionStorage - stores data for one session
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