Explanations, Examples, and Resources for User Agent Accessibility Guidelines 2. UAAG 2. 0 Reference provides supporting information for the User Agent Accessibility Guidelines (UAAG) 2. UAAG 2. 0 guides developers in designing user. User agents include browsers, media players and applications that. UAAG 2. 0 Reference provides explanation of the intent and best practices of UAAG 2.

The . UAAG is introduced in the User Agent Accessibility Guidelines (UAAG) Overview. May be. Superseded. This section describes the status of this document at the time of its. Other documents may supersede this document. A list of current. W3. C publications and. W3. C technical reports.

TR/. W3. C Working Group Note of UAAG 2. Reference. This is the W3. C Working Group Note of 1. December 2. 01. 5 from the User Agent Accessibility Guidelines Working Group (UAWG).

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The substantive change to UAAG 2. Reference: There are minor changes to UAAG 2. Reference: corrected spelling and grammar. Editor Notesupdated Reference links from ATAG 1.

ATAG 2. 0removed inactive link to Blackberry Smartphone keyboard shortcutsupdated Acknowledgments. A diff document of all changes is available.

Comments on the draft should be sent to public- uaag. Public Archive). Although the UAWG is closing, comments can provide useful input for future work in this area. The. goals of the User Agent Working Group (UAWG) are discussed in the Working Group charter. No. Endorsement. Publication as a Working Group Note does not imply endorsement by the W3. C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress. Patents. This document was produced by a group operating under the 5 February 2.

W3. C Patent Policy. W3. C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3. C Patent Policy. This document is governed by the 1 September 2. W3. C Process Document.

This document – UAAG 2. Reference: Explanations, Examples, and Resources for User Agent Accessibility Guidelines 2. User Agent Accessibility Guidelines (UAAG) 2. UAAG 2. 0 provides three layers of guidance for lowering barriers to accessibility: overall principles, general guidelines, and testable success criteria. The principles, guidelines and success criteria are normative, meaning user agent developers are required to follow them to claim conformance to UAAG 2. UAAG 2. 0 Reference is informative. It provides more detail for each success criterion, including explanatory intent, examples of how the criterion may apply in different user situations, and links to resources.

It also contains more detail on levels of conformance, the definition of user agent, the relationship between UAAG 2. WCAG 2. 0 requirements, and the role of user agents and web authoring. Levels of. Conformance. User agents can conform to UAAG 2. A (minimum), AA (recommended), and AAA (advanced). The three levels of UAAG 2.

A, AA, or AAA) of the individual success criteria (i. The user agent can conform to a level by meeting the success criteria of that level and the levels below it. Level A conformance: The user agent complies with all applicable level A success criteria. Level AA conformance: The user agent complies with all applicable level A and AA success criteria Level AAA conformance: The user agent complies with all applicable level A, AA, and AAA success criteria. UAAG 2. 0 has many options that can be managed through preference settings. The level designations of the individual success criteria balance the needs of people with disabilities with user agent implementation difficulty.

Generally: Level A success criteria address aspects of user agents that. Level AA success criteria address aspects of user agents that. Level AAA success criteria address aspects of user agents that. The level designation of individual success criteria is based on the overall situation considering all disabilities and all user agents. Even user agents that conform at the highest level (AAA) may not be accessible to individuals with all types, degrees, or combinations of disability. Using levels. Developers of user agents may want to use the levels to: Help prioritize accessibility improvements to their projects, giving more weight to the level A and AA success criteria. Help decide how to provide accessibility functionality in the user interface, for example, putting Level A functionality in a toolbar, Level AA in the main preference area, and Level AAA in an .

While this applicability is always part of the normative wording of each success criteria, for ease of understanding, this (informative) document provides one or more of the following . Note that the content user interface defintion includes the rendered content. Communication with platform accessibility services.

When the success criterion will be applicable to programmatic communication with one or more platform accessibility services. Configuration settings. When the success criterion requires that a particular configuration setting exist (e. On some platforms, configuration settings are known as preference settings. Configuration settings (optional)When the success criterion requires functionality, but lets the developer decide whether the functionality will always be turned on or whether it could be controlled by a configuration setting. A user agent is any software that retrieves, renders and facilitates end- user interaction with web content. See the Glossary definition of user agent for details.

The classic user agent is a browser. A media player, which only performs these functions for time- based media, is also user agent. Web applications and some mobile apps that render web content are also user agents.

For information on the difference between web applications and content see Relationship to the Web Content Accessibility Guidelines. The Role of User Agents in Web Authoring. The following is a list of several ways in which user agents are commonly involved in web content authoring and the relationship between UAAG 2. ATAG 2. 0. Preview tool: Authors often preview their work in user agents to test how the content will be appear and operate.

ATAG 2. 0 includes a special exception when previews are implemented with pre- existing user agents, so there are no additional requirements on user agent developers in this case. Checking tool: Authors often make use of user agent error panels (e. HTML validity, Java. Script errors) during authoring. ATAG 2. 0 Part A applies, but may not include additional accessibility requirements beyond the UAAG 2.

If a user agent includes an . In this mode, the user agent is acting as an authoring tool and all of ATAG 2.

Automatic content changes: Some user agents or plug- ins can automatically change retrieved web content before it's rendered. This functionality is not considered an authoring tool because changes are made to the user's own experience, not the experience of other users. Providing a platform for web- based authoring tools: Many web applications serve as authoring tools and make use of user agent features to deliver functionality (e. UAAG 2. 0 Guidelines. UAAG 2. 0 Conformance Applicability Notes: The Conformance Applicability Notes are a list of normative conditions that apply broadly to many of the success criteria in these guidelines. Generally, the notes clarify how the success criteria would apply under certain circumstances.

Retrieved Content Only: UAAG 2. For example, if a success criterion requires high contrast between foreground text and its background, the user agent can also provide choices with low contrast. While it is preferred to have a required behavior as a default option, it does not need to be, unless the success criterion explicitly says otherwise. RFC 2. 11. 9 language not used: UAAG 2.

RFC 2. 11. 9 language (must, may, should) as it is not an interoperable specifications. Note. even if these terms appear from time to time they do not have any RFC. Simultaneous satisfaction of success criteria: Users can access all behaviors required by UAAG 2. Install App On Ubuntu Touch Devices. Mongolian, Han), success criteria normally relating to horizontal rendering should be applied to vertical rendering instead. A required behavior can be provided by the platform, user agent, user agent add- ons, or potentially other layers. All are acceptable, as long as they are enumerated in the conformance claim. Platform limitations: If the platform (hardware or operating system) does not support a capability necessary for a given UAAG 2.

Components of UAAG 2. Conformance Claims #8. Override author settings for text configuration: All of the success criteria under guideline 1. PRINCIPLE 1 - Ensure that the user interface.

Reference for. Guideline 1. Provide access to alternative content. It's recommended that users can also choose at least one alternative, such as alt text, to be displayed by default (1. In these cases the user needs to be able to hide that element or replace it with alternative content or a placeholder. Other users can find specific elements are simply unusable (e.

In these cases the user needs to be able to access author- provided alternative content (e. Some users with disabilities need alternate languages or audio tracks (e. Users need the ability to choose tracks that best meet their accessibility needs (e. He can hide foreground images by right- clicking on them or pressing the Tab key to move focus to them, and then choosing a command from the element's context menu. However, the browser does not let him right- click or navigate to the background image. Therefore it provides a user preference setting to hide all background images or to hide the background image on the current site.