The XML Schema Working Group invites implementation of the Candidate Recommendation s XML Schema Definition Language (XSD) 1.1 Part 1: Structures and XML Schema Definition Language (XSD) 1.1 Part 2: Datatypes. The first document specifies the XML Schema Definition Language, which offers facilities for describing the structure and constraining the contents of XML documents, including those which exploit the XML Namespace facility. The schema language, which is itself represented in an XML vocabulary and uses namespaces, substantially reconstructs and considerably extends the capabilities found in XML document type definitions (DTDs). This specification depends on XML Schema Definition Language 1.1 Part 2: Datatypes, which defines facilities for defining datatypes to be used in XML Schemas as well as other XML specifications. Learn more about the Extensible Markup Language (XML) Activity.

The Web Performance Working Group has published a Last Call Working Draft of Page Visibility. This specification defines a means for site developers to programmatically determine the current visibility state of the page in order to develop power and CPU efficient web applications. Comments are welcome through 18 August. Learn more about the Rich Web Client Activity.

The Web Applications Working Group has published the First Public Working Draft of The From-Origin Header. The Web platform currently has no limitations on embedding resources from different origins. This specification defines a wayfor resources to declare they are unavailable within an embedding context. Learn more about the Rich Web Client Activity.

The Authoring Tool Accessibility Guidelines Working Group has published updated Working Drafts of Authoring Tool Accessibility Guidelines (ATAG) 2.0 and the companion document Implementing ATAG 2.0. ATAG defines how authoring tools should help developers produce accessible web content that conforms to Web Content Accessibility Guidelines (WCAG) 2.0. It also defines how to make authoring tools accessible so that people with disabilities can use them. Comments are welcome through 15 September 2011. Please see the invitation to review the ATAG 2.0 Working Draft for more information. Learn more about the Web Accessibility Initiative (WAI).

The User Agent Accessibility Guidelines Working Group has published an updated Working Draft of the User Agent Accessibility Guidelines (UAAG) 2.0. UAAG defines how browsers, media players, and other "user agents" should support accessibility for people with disabilities and work with assistive technologies. The Working Group also published an updated Working Draft of Implementing UAAG 2.0. Read the invitation to review the UAAG 2.0 Working Draft and about the Web Accessibility Initiative (WAI).

The i18n checker is a free service from W3C that provides information about internationalization-related aspects of your HTML page and advice on creating markup that supports the multilingual Web. This latest release uses a new user interface and redesigned source code. It also adds a number of new tests, a file upload facility, and support for HTML5. This is still a 'pre-final' release and development continues. There are already plans to add further tests and features, to translate the user interface, to add support for XHTML5 and polyglot documents, to integrate with the W3C Unicorn checker, and to add various other features. At this stage we are particularly interested in receiving user feedback. Learn more about Web Internationalization.