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HTML5 : il linguaggio del WWW si evolve.

By titticimmino | Published: August 31, 2009

Il linguaggio del World Wide Web comincia a prendere le sue distanze dalla sua precedente versione HTML4, evolvendosi nell’HTML5.

Secondo l’ultimo working draft rilasciato il 26 agosto dall’HTML Working Group, pur essendo ancora in work in progress , l’HTML5  potenzialmente andrà ad impattare la Web Architecture delle seguenti Aree:

The use of the DOM as a basis for defining the language.
The concept of browsing contexts.
The distinction between user agent requirements and authoring requirements.
The use of imperative definitions rather than abstract definitions with the requirement of black-box equivalence in implementations.
The new content model concepts (replacing HTML 4’s block and inline concepts).
The focus on accessibility as a built-in concept for new features (such as the hidden attribute, the progress element, et cetera) instead of an add-on (like the alt attribute).
The focus on defining the semantics in detail (e.g. the outline algorithm, replacing the vague semantics in HTML 4).
The menu and command elements.
The origin concept.
Offline Web application caches.
The definition of the browsing context “navigation” algorithm and the related session history traversal algorithms.
The content-type sniffing and character encoding sniffing.
The very explicit definition of a parser.
The contentEditable feature and the UndoManager feature.
The Drag and Drop and Copy and Paste architecture.
The cross-document messaging feature (the postMessage API).
The new sandboxing features for iframe.
The definition of URL.

Qualche differenza tra HTML5 e HTML4, relativamente alla Sintassi, alla dichiarazione DOCTYPE, agli elementi

HTML 5 defines an HTML syntax that is compatible with HTML 4 and XHTML 1 documents published on the Web, but is not compatible with the more esoteric SGML features of HTML 4, such as processing instructions and shorthand markup. Documents using the HTML syntax must be served with the text/html media type.

….

The DOCTYPE declaration is <!DOCTYPE html> and is case-insensitive in the HTML syntax. DOCTYPEs from earlier versions of HTML were longer because the HTML language was SGML-based and therefore required a reference to a DTD. With HTML 5 this is no longer the case and the DOCTYPE is only needed to enable standards mode for documents written using the HTML syntax. Browsers already do this for <!DOCTYPE html>

…

The following elements are not in HTML 5 because their usage affected usability and accessibility for the end user in a negative way:

frame
frameset
noframes

…

The open issues include (this list is not exhaustive):

De facto semantic definitions for some formerly presentational elements.
Details of accessibility and media-independence features, such as the alt and summary attributes.

Ecco il draft completo.

Roberto ci racconta qualcosa di concreto sull’HTML circa il METAVID.org

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Updated 2999/09/04

See also HTML5 close to you at all times with this HTML5 pocket book:

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