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HTML5 ( Hyper Text Markup Language)

HTML5 ( Hyper Text Markup Language). Lab 223 潘建廷 chp32324@hotmail.com 何偉聖 administratorEx@hotmail.com. Introduce. 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.

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HTML5 ( Hyper Text Markup Language)

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  1. HTML5 (HyperText Markup Language) Lab 223 潘建廷 chp32324@hotmail.com 何偉聖administratorEx@hotmail.com

  2. Introduce • 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.

  3. Goals • Document real-world browser behaviour • Document and standardise useful extensions • Develop practical new features • Ensure backwards compatibility • Define robust error handling

  4. Design Principles • Foundation of Design and Development • Organised into 3 Categories • Compatibility • Utility • Interoperability

  5. Design Principles: Compatibility • Support Existing Content • Degrade Gracefully • Don't Reinvent the Wheel • Pave the Cow paths • Evolution, not Revolution

  6. Design Principles: Utility • Solve Real Problems • Priority of Constituencies • Media Independence • Universal Access • Support World Languages • Secure By Design • Separation of Concerns

  7. Design Principles: Interoperability • Well-Defined Behaviour • Avoid Needless Complexity • Handle Errors

  8. Benefits of HTML • Backwards compatible with legacy UAs • Author familiarity • Lenient and forgiving syntax • Convenient shorthand syntax • Can omit some tags and attribute values

  9. Benefits of XHTML • Strict XML Syntax • Integrate directly with other XML vocabularies • SVG, MathML • Use XML Processing

  10. Document Representations • HTML5 will be the new standard for HTML, XHTML, and the HTML DOM.

  11. HTML5 were established • New features should be based on HTML, CSS, DOM, and JavaScript • Reduce the need for external plugins(like Flash) • Better error handling • More markup to replace scripting • HTML5 should be device independent • The development process should be visible to the public

  12. 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

  13. Video H.264 support in the “Big-5”

  14. 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

  15. Video – UI controls

  16. 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.

  17. Web Storage • 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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