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HTML 5


HTML5 is the latest evolution of the standard that defines HTML. The term represents two different concepts. It is a new version of the language HTML, with new elements, attributes, and behaviors, and a larger set of technologies that allows the building of more diverse and powerful Web sites and applications. This set is sometimes called HTML5 & friends and often shortened to just HTML5.
Designed to be usable by all Open Web developers, this reference page links to numerous resources about HTML5 technologies, classified into several groups based on their function.
  • Semantics: allowing you to describe more precisely what your content is.
  • Connectivity: allowing you to communicate with the server in new and innovative ways.
  • Offline and storage: allowing webpages to store data on the client-side locally and operate offline more efficiently.
  • Multimedia: making video and audio first-class citizens in the Open Web.
  • 2D/3D graphics  and effects: allowing a much more diverse range of presentation options.
  • Performance and integration: providing greater speed optimization and better usage of computer hardware.
  • Device access: allowing for the usage of various input and output devices.
  • Styling: letting authors write more sophisticated themes.

SEMANTICS

Sections and outlines in HTML5
A look at the new outlining and sectioning elements in HTML5: <section><article><nav><header><footer> and <aside>.
Using HTML5 audio and video
The <audio> and <video> elements embed and allow the manipulation of new multimedia content.
Forms improvements
A look at the constraint validation API, several new attributes, new values for the <input> attribute type and the new <output> element.
New semantic elements
Beside sections, media and forms elements, there are numerous new elements, like <mark><figure><figcaption><data><time><output><progress>, or <meter> and <main>, increasing the number of valid HTML5 elements.
Improvement in <iframe>
Using the sandbox and srcdoc attributes, authors can now be precise about the level of security and the wished rendering of an <iframe> element.
MathML
Allows directly embedding mathematical formulas.
Introduction to HTML5
This article introduces how to indicate to the browser that you are using HTML5 in your web design or web application.
HTML5 Cheat Sheet 
A handy HTML 5 cheat sheet for beginners who want to master HTML 5, its elements, event attributes and compatibility.
HTML5-compliant parser
The parser, which turns the bytes of an HTML document into a DOM, has been extended and now precisely defines the behavior to use in all cases, even when faced with invalid HTML. This leads to far greater predictability and interoperability between HTML5-compliant browsers.

CONNECTIVITY

Web Sockets
Allows creating a permanent connection between the page and the server and to exchange non-HTML data through that means.
Server-sent events
Allows a server to push events to a client, rather than the classical paradigm where the server could send data only in response to a client's request.
WebRTC
This technology, where RTC stands for Real-Time Communication, allows connecting to other people and controlling videoconferencing directly in the browser, without the need for a plugin or an external application.

OFFLINE & STORAGE

Offline resources: The application cache
Firefox fully supports the HTML5 offline resource specification. Most others have offline resource support at some level.
Online and offline events
Firefox 3 supports WHATWG online and offline events, which let applications and extensions detect whether or not there's an active Internet connection, as well as to detect when the connection goes up and down.
WHATWG client-side session and persistent storage (aka DOM storage)
Client-side session and persistent storage allows web applications to store structured data on the client side.
IndexedDB
IndexedDB is a web standard for the storage of significant amounts of structured data in the browser and for high performance searches on this data using indexes.
Using files from web applications
Support for the new HTML5 File API has been added to Gecko, making it possible for web applications to access local files selected by the user. This includes support for selecting multiple files using the <input> of type fileHTML element's new multiple attribute. There also is FileReader.

MULTIMEDIA

Using HTML5 audio and video
The <audio> and <video> elements embed and allow the manipulation of new multimedia content.
WebRTC
This technology, where RTC stands for Real-Time Communication, allows connecting to other people and controlling videoconferencing directly in the browser, without the need for a plugin or an external application.
Using the Camera API
Allows using, manipulating, and storing an image from the computer's camera.
Track and WebVTT
The <track> element allows subtitles and chapters. WebVTT is a text track format.

3D GRAPHICS AND EFFECTS

Canvas tutorial
Learn about the new <canvas> element and how to draw graphs and other objects in Firefox.
HTML5 Text API for <canvas> elements
The HTML5 text API is now supported by <canvas> elements.
WebGL
WebGL brings 3D graphics to the Web by introducing an API that closely conforms to OpenGL ES 2.0 that can be used in HTML5 <canvas> elements.
SVG
An XML-based format of vectorial images that can directly be embedded in the HTML.

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