W3C

Authoring Tool Accessibility Guidelines 2.0

Jan & Tim's Draft 8 July 2003

This version:
http://www.w3.org/WAI/AU/2003/WD-ATAG20-20030606/
Latest version:
http://www.w3.org/TR/ATAG20/
Previous version:
http://www.w3.org/TR/2003/WD-ATAG20-20030314/
Editors:
Jutta Treviranus - ATRC, University of Toronto
Charles McCathieNevile
Jan Richards - University of Toronto
Matt May - W3C

Abstract

This specification provides guidelines for Web authoring tool developers. Its purpose is two-fold: to assist developers in designing authoring tools that produce accessible Web content and to assist developers in creating an accessible authoring interface.

Authoring tools can enable, encourage, and assist users ("authors") in the creation of accessible Web content through prompts, alerts, checking and repair functions, help files and automated tools. It is as important that all people be able to author content as it is for all people to have access to it. The tools used to create this information, therefore, must also be accessible. Implementation of these guidelines will contribute to the proliferation of Web content that can be read by a broader range of readers and authoring tools that can be used by a broader range of authors in a wider range of contexts with more devices.

This document is part of a series of accessibility documents published by the W3C Web Accessibility Initiative (WAI).

Status of this document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. The latest status of this document series is maintained at the W3C.

This is a Public Working Draft of a document which will supersede the W3C Recommendation Authoring Tool Accessibility Guidelines 1.0 [ATAG10]. It has been made available for review by W3C Members and other interested parties, in accordance with W3C Process. It is not endorsed by the W3C or its Members. It is inappropriate to refer to this document other than as a "work in progress".

This document has been produced by the Authoring Tool Accessibility Guidelines Working Group (AUWG) as part of the Web Accessibility Initiative (WAI). The goals of the Working Group are discussed in the AUWG charter.

The Working Group maintains a list of patent disclosures and issues related to ATAG 2.0.

A list of current W3C Recommendations and other technical documents including Working Drafts and Notes can be found at http://www.w3.org/TR/. The AUWG is part of the WAI Technical Activity.

This draft refers to the Web Content Accessibility Guidelines (WCAG) for specification of accessible content and refers non-normatively to the Techniques for Authoring Tool Accessibility [ATAG20-TECHS]. The working group has provided a reference called ATAG 2.0 References to WCAG [WCAG-REFS] mapping the ATAG checkpoints to WCAG 1.0 and the January 2003 draft of WCAG 2.0, currently a W3C Working Draft.

The AUWG expects the ATAG 2.0 to be backwards-compatible with ATAG 1.0, or at most to make only minor changes in requirements. Before this document reaches last call, the Working Group will publish a detailed analysis of the differences in requirements.

The working group maintains an ATAG 2.0 Issues List.

Please send comments about this document to the public mailing list: w3c-wai-au@w3.org (public archives). Please note that this document may contain typographical errors. It was published as soon as possible since review of the content itself is important, although noting typographical errors is also helpful.

For information about the current activities of the working group, please refer to the AUWG home page. This page includes an explanation of the inter-relation of each document as well as minutes and previous drafts.

Table of contents


1. Introduction

1.1 Definition of Authoring Tool

Any software or service that authors may use to create or modify Web content for publication. This includes software that enables authors to perform any of the following functions:
1. Text Editing: Authors manipulate plain text data (e.g. markup text, program code, etc.). [Example 1]
2. Symbol-Level Editing: Authors manipulate symbols (not WYSIWYG renderings) that represent low-level functional groups in the underlying plain text data (e.g. symbols in place of markup elements, programming code operations, multi-element placeholder, etc.) .[Example 2]
3. WYSIWYG Editing: Authors manipulate browser-like renderings of the underlying plain text data (e.g. rendered text, images, etc. in place of markup elements). [Example 3]
4. Graphics Editing: Authors manipulate renderings of object-oriented graphics (e.g. rendered lines, etc. in place of markup elements in a drawing program, animation tool stage, etc.). [Example 4]
5. Content Management: Authors exercise control of changes to Web content across whole documents or groups of documents, rather than at the level of individual instances of content (e.g. site building wizards, site management tools, courseware, content aggregators, etc.). [Example 5]
6. Constrained Editing: Authors make highly constrained inputs that are structured and styled according to static templates (e.g. guest books, message boards, etc.). [Example 6]
7. Timeline Editing: Authors manipulate time-dependent Web content (e.g. animation, music, etc.) using a user interface that represents a series of frames. [Example 7]
8. Format Conversion: Authors are assisted in causing Web content encoded in one format to become encoded in another (e.g. saving Web content created in one format in a different format, importing Web content from a different format, etc.) [Example 8]

1.2 Role of authoring tools in Web accessibility

Everyone should have the ability to create and access Web content.

Authoring tools are pivotal in achieving this principle. The accessibility of authoring tools determines who can create Web content and the output of authoring tools determines who can access Web content.

The guidelines set forth in this document will benefit people regardless of disability. This includes people who need to use their eyes for another task and are unable to view a screen, people in environments where the use of sound is not practical, and people who use small mobile devices with small screens, no keyboard, or no mouse.

The guidelines promote the following goals:

The accessibility of authoring tools is defined primarily by existing specifications for accessible software. The accessibility of authoring tool output is defined by the Web Content Accessibility Guidelines (WCAG).

1.3 How this document is organized

This document contains four guidelines that reflect the goals of accessible authoring tool design:

Each guideline includes:

Each checkpoint is intended to be sufficiently specific to be verifiable, while being sufficiently general to allow developers the freedom to use the most appropriate strategies to satisfy it. The checkpoints specify requirements for meeting the guidelines. Each checkpoint includes:

A separate document, entitled "Techniques for Authoring Tool Accessibility Guidelines 2.0" [ATAG20-TECHS], provides suggestions and examples of how to achieve the recommendations in this document. Another document [ATAG20-CHECKLIST] lists all checkpoints, ordered by priority, for convenient reference.

1.4 Checkpoint priorities

Each checkpoint in the specification has been assigned one of the following priority levels to indicate the importance of the checkpoint in satisfying the guidelines:

Priority 1
The checkpoint is essential.
Priority 2
The checkpoint is important.
Priority 3
The checkpoint is beneficial.
Relative Priority (Level 1, 2, or 3)
The importance of the checkpoint depends on the specific requirements of WCAG and is therefore relative to priorities assigned in those guidelines.

Note: The choice of priority level for each checkpoint is based on the assumption that the author is a competent, but not necessarily expert, user of the authoring tool, and that the author has little or no knowledge of accessibility. For example, the author is not expected to have read all of the documentation, but is expected to know how to turn to the documentation for assistance.

1.5 Conformance

An ATAG conformance claim for an authoring tool must indicate which of the following conformance levels has been met:

Conformance Level "A"
Tool has met all Priority 1 checkpoints and has also met all Relative Priority checkpoints to at least Level 1.
Conformance Level "Double-A"
Tool has met all Priority 1 and 2 checkpoints and has also met all Relative Priority checkpoints to at least Level 2.
Conformance Level "Triple-A"
Tool has met all checkpoints and has also met all Relative Priority checkpoints to Level 3.

For the purposes of ATAG 2.0 conformance claims, tools may be bundled together (e.g. a markup editor and a evaluation and repair tool or a multimedia editor with a custom plug-in), however, this has two important consequences:

  1. The bundled tools must be distributed together in order for each to maintain that conformance claim.
  2. Bundled tools may have more difficulty meeting the checkpoints in Guideline 4 (Integrate accessibility solutions into the overall "look and feel") than single, integrated tools.

Conformance Icons: There are currently no conformance icons available for this draft specification. If it becomes a Recommendation, it is expected that there will be conformance icons like those available for ATAG 1.0.

1.6 Accessible authoring processes

From the standpoint of accessibility, Web authoring is a process that may involve one or more tools in parallel or in sequence. In order to ensure that the Web content produced as a result of a Web authoring process is accessible, developers and purchasers should choose tools that are either ATAG 2.0 conformant or ATAG 2.0-"Friendly". ATAG-"Friendly" tools are tools which, although they do not conform with ATAG, are also very unlikely to degrade the accessibility of Web content. For example, an ATAG-friendly tool is one that converts the URI locations in a Web page from absolute to relative prior to publishing.

In some cases, strategic ordering of the tools in a Web authoring process may increase the likelihood of producing accessible content. For example, a markup editor that does not conform to ATAG might be used before an ATAG conformant evaluation and repair tool. While this is, of course, preferable to not addressing accessibility at all, the original markup tool is still considered ATAG non-conformant. Considering the markup editor and evaluation and repair tool together is possible, but due to the low likelihood of proper integration between the tools, the result is unlikely to be a high level of ATAG conformance.

2. Guidelines

GUIDELINE 1: Ensure that the tool itself is accessible

An authoring tool is a software program with standard user interface elements and as such must be designed according to relevant user interface accessibility guidelines. When custom interface components are created, it is essential that they be accessible through the standard access mechanisms for the relevant platform so that assistive technologies can be used with them.

Some additional user interface design considerations apply specifically to Web authoring tools. For instance, authoring tools must ensure that the author can edit (in an editing view) using one set of stylistic preferences and publish using different styles. Authors with low vision may need large text when editing but want to publish with a smaller default text size. The style preferences of the editing view must not affect the markup of the published document.

Authoring tools must also ensure that the author can navigate a document efficiently while editing. Authors who use screen readers, refreshable Braille displays, or screen magnifiers can make limited use (if any) of graphical artifacts that communicate the structure of the document and act as signposts when traversing it. Authors who cannot use a mouse (especially people with physical disabilities or who are blind) must use the slow and tiring process of moving one step at a time through the document to access the desired content, unless more efficient navigation methods are available. Authoring tools should therefore provide an editing view that conveys a sense of the overall structure and allows structured navigation.

Note: Documentation, help files, and installation are part of the software and need to be available in an accessible form.

1.1 Ensure that the authoring interface follows applicable software accessibility guidelines. ([Priority 1] for required elements of the software accessibility guidelines; [Priority 3] for recommended elements of the software accessibility guidelines.)

Rationale: If the authoring tool interface does not follow these conventions, the author who depends upon the techniques associated with the conventions is not likely to be able to use the tool.

Techniques: Implementation Techniques for Checkpoint 1.1, Evaluation Techniques for Checkpoint 1.1

Success Criteria:

  1. The authoring interface must pass the Software Accessibility Guidelines testing criteria. (Priority 1 for Required criteria; Priority 3 for Recommended criteria)

Specific considerations when designing an accessible authoring interface

@@ TEXT GOES HERE @@
1.2 Ensure that the authoring interface enables accessible editing of element and object properties. [Priority 1]

Rationale: Element or object properties displayed and edited through graphic means are not accessible to authors using screen readers, Braille displays or screen enhancers. The explicit property value should be accessible to those technologies which read text and support authors editing text.

Techniques: Implementation Techniques for Checkpoint 1.2, Evaluation Techniques for Checkpoint 1.2

Success Criteria:

  1. At least one editing method must pass the Software Accessibility Guidelines testing criteria for each element and object property editable by the tool. (Priority 1 for Required criteria; Priority 3 for Recommended criteria)
1.3 Allow the display preferences of the authoring interface to be changed without affecting the document markup. [Priority 1]

Rationale: Authors may require a set of display preferences to view and control the document that is different from the desired default
display style for the published document (e.g. a particular text-background combination that differs from the published version).

Techniques: Implementation Techniques for Checkpoint 1.3, Evaluation Techniques for Checkpoint 1.3

Success Criteria:

  1. All editing views must display text equivalents for any the non-text content
  2. The editing views must either respect the following operating system display settings or provide equivalent functions for displaying text content without affecting the display settings in the content markup:
  3. All editing views must either respect operating system display settings (for color, contrast, size, and font) or, from within the tool, provide a means of changing color, contrast, size and font, without affecting the content markup.
1.4 Ensure that the authoring interface enables the author to navigate the structure and perform structure-based edits. [Priority 2]

Rationale:
Efficient authoring requires that the author be able to move quickly to arbitrary locations in the content and, once there, make modifications beyond character-by-character edits. This is usually best accomplished by making use of any explicit structure that may have been encoded with hierarchy-based markup. When explicit structure is unavailable, the implicit structure in the visual look and layout of content may sometimes be used.

Techniques: Implementation Techniques for Checkpoint 1.4, Evaluation Techniques for Checkpoint 1.4

Success Criteria:

  1. In any element hierarchy, the author must be able to move editing focus from any structural element to any element (if any) immediately above, immediately below or in the same level in the hierarchy.
  2. In any element hierarchy, the author must be able to select, copy, cut and paste any whole element with its their content.
1.5 Ensure the authoring interface allows the author to search within the editing views. [Priority 2]

Rationale: Search functions, such as simple string matching or more complex mechanisms that take advantage of the structure (elements, attributes, etc.) inherent in marked-up content, facilitate author navigation of content as it is being authored.@@ revisit this in light of new success criteria. @@

Techniques: Implementation Techniques for Checkpoint 1.5, Evaluation Techniques for Checkpoint 1.5

Success Criteria:

  1. The authoring tool must have a search function for all every editing views.
  2. The author must be able to search for text within all text equivalents of any rendered non-text content.
  3. The author must be able to specify whether they wish to search content, markup, or both.

GUIDELINE 2: Ensure that the tool is designed to produce accessible content

The most basic determinant of the accessibility of Web content is the degree to which the authoring tool that produced it gives priority to markup validity and accessibility. Tools that generate and preserve high quality markup are well prepared to meet the other guidelines.

Generating standard markup:

Conformance with standards promotes interoperability and accessibility by making it easier to create specialized user agents that address the needs of users with disabilities. In particular, many assistive technologies used with browsers and multimedia players are only able to provide access to Web documents that use valid markup. Therefore, valid markup is an essential aspect of the accessibility compliance of an authoring tool.

Where applicable use W3C Recommendations, which have been reviewed to ensure accessibility and interoperability and which are relied upon by assistive technology developers. If there are no applicable W3C Recommendations, use a published standard that enables accessibility.

2.1 Ensure that markup which the tool automatically generates is valid for the language the tool is generating. [Priority 1]

Rationale: Following language specifications is the most basic requirement for accessible content production. When content is valid, it is easier to check and correct accessibility errors and user agents are better able to render the content properly and personalize the content to the needs of individual users' devices.

Techniques: Implementation Techniques for Checkpoint 2.2, Evaluation Techniques for Checkpoint 2.2

Success Criteria:

  1. All markup strings written by the tool must be valid, as defined by the relevant W3C Recommendation or other format specification. This does not apply where the markup itself has been authored "by hand".
  2. All markup strings written automatically by the tool (i.e. not authored "by hand") must conform to the applicable markup language specification.
2.2 Use the latest versions of W3C format Recommendations when they are available and appropriate for a task. [Priority 2] @@ed. group must decide whether to keep this checkpoint in its current form@@

Rationale: The W3C has implemented an accessibility review process for language recommendations that has resulted in addition of supports for accessibility within many of these languages as well as published Notes describing best use practices for some of the most popular languages. Because this process is ongoing, more recent versions of W3C language recommendations are likely to include better supports for accessibility than older ones.

Techniques: Implementation Techniques for Checkpoint 2.1, Evaluation Techniques for Checkpoint 2.1

Success Criteria:

  1. Provide an accessible reading of web content in available, relevant W3C recommended language format and provide accessible means for editing and writing in that language format.
  2. The tool may use non-W3C formats in addition to the W3C Recommendations.
  3. A W3C Recommendation is considered available to a specific version of an authoring tool, if the Recommendation has reached the Candidate Recommendation phase at least two (2) years before the version of the tool in question is released for use.
  4. Whether a W3C Recommendation is appropriate depends on the features of the tool. Critical relevance criteria will depend on the task, but may include support for media, scripting, or styling. When comparing the appropriateness of W3C recommendations with other, non-W3C formats for a particular task, accessibility must be included as a comparison criteria.
  5. Inform the author in marketing, packaging and other documentary material of the name and version of any W3C Recommendations used. This notice must specify whether the conformance with the Recommendation is full or partial.

Supporting accessible authoring practices:

If the tool automatically generates markup, many authors will be unaware of the accessibility status of the final content unless they expend extra effort to review it and make appropriate corrections by hand. Since many authors are unfamiliar with accessibility, authoring tools are responsible for automatically generating accessible markup, and where appropriate, for guiding the author in producing accessible content.

Many applications feature the ability to convert documents from other formats (e.g., Rich Text Format) into a markup format specifically intended for the Web such as HTML. Markup changes may also be made to facilitate efficient editing and manipulation. It is essential that these processes do not introduce inaccessible markup or remove other content intended to increase accessibility, particularly when a tool hides the markup changes from the author's view.

2.3 Ensure that the author can produce accessible content in the markup language(s) supported by the tool. [Priority 1]

Rationale: If it is at least possible for the author to produce accessible content, then well-informed authors may be able to work around any accessibility short-comings in the rest of the authoring tool.

Techniques: Implementation Techniques for Checkpoint 2.3, Evaluation Techniques for Checkpoint 2.3

Success Criteria:

  1. A method for authoring "by hand" is provided (e.g. code editing view).
  2. Tools must always meet at least one of the following:
    • generate accessible content automatically
    • provide a method for authoring "by hand"
    • provide the author with accessible options for every authoring task

If authoring "by hand" is not provided then:

  1. Tools that provide the author with choice as to how content will be marked up, must ensure accessible alternatives to every inaccessible choice.
  2. Tools that generate content automatically always generate accessible markup. (In other words, the tool meets Checkpoint 2.5 to Relative Priority Level 3).
2.4 Ensure that the tool preserves all accessibility information during transformations, and conversions. [Priority 1] @@ed. should this be Relative Priority???@@

Rationale: Authors will be discouraged from adding accessibility information if it is discarded during conversions (i.e. taking content encoded in one markup language and re-encoding it in another) or transformations (i.e. modifying the encoding of content without changing the markup language).

Techniques: Implementation Techniques for Checkpoint 2.4, Evaluation Techniques for Checkpoint 2.4

Success Criteria:

  1. During all transformations and conversions, any accessibility information must be preserved, unless prevented by limitations of the target format.
  2. When accessibility information cannot be preserved during a conversion or transformation, the author must notified beforehand.
  3. When transformations or conversions move content from grammatically-rich to grammatically-poor languages or markups entities, the structure of the content may be flattened to the point where it is insufficient to allow the reversal of the transformation. The tool must utilize as much structural richness of the target language or markup entity as is possible.
  4. When reversal of the transformation is not possible, the author is notified prior to the conversion or transformation.
  5. Equivalent alternatives (e.g. labels, descriptions, etc.) are preserved during every transformation or conversion and is still available and useful for the purpose of providing equivalent information for the non-text element.
  6. Structural information (e.g. heading, etc.) is preserved during every transformation or conversion and is still available and useful for navigation.
  7. Separation of content from presentation is preserved during every transformation or conversion and is still separate from presentation to the degree possible in the new format.
2.5 Ensure that when the tool automatically generates content it conforms to the WCAG. [Relative Priority] @@Ensure that any automatically generated content conforms to WCAG.@@

Rationale: Authoring tools that automatically generate content that does not conform to WCAG are an obvious source of accessibility problems.

Techniques: Implementation Techniques for Checkpoint 2.5, Evaluation Techniques for Checkpoint 2.5

Success Criteria:

  1. All markup strings written automatically by the tool (i.e. not authored "by hand") must conform to WCAG.
  2. All markup strings written by the tool are accessible as defined by WCAG (see Note on Relative Priority), unless the markup has been authored "by hand".
  3. Markup strings that the tool generates from author selections of elements and attributes by name (e.g. from lists. etc.) are accessible as defined by WCAG (see Note on Relative Priority).
  4. This applies to the choice of markup type, file type, and markup practices.
  5. The tool may provide the author with the option of disabling or altering the accessible defaults.
2.6 Ensure that all pre-authored content for the tool conforms to WCAG. [Relative Priority]

Rationale: Pre-authored content (e.g. templates, images, videos, etc.) is often included with authoring tools for the convenience of the author. Ensuring that pre-authored content is WCAG conformant increases that convenience by ensuring that authors can use any of the content without concern for the accessibility implications and relieving subsequent authors from having to compose their own version of alternative content.

Techniques: Implementation Techniques for Checkpoint 2.6, Evaluation Techniques for Checkpoint 2.6

Success Criteria:

  1. Any Web content (e.g. templates, clip art, multimedia objects, scripts, applets, example pages, etc.) preferentially licensed (i.e. better terms of use for users of tool than for others) for users of the tool, must conform to WCAG.
  2. Web content (e.g. templates, clip art, multimedia objects, scripts, applets, example pages, etc.) included with the distribution of the tool or provided preferentially to authors using the tool, must conform to WCAG (see Note on Relative Priority). Preferential offerings include those in the distribution file or media as well as those offered by the developer or its partners to which authors not using the tool would not have access, e.g., free clip art for registered owners.
  3. Objects that require alternative descriptions (see WCAG) have this information stored internally (e.g. as text tracks) or externally (e.g. as files, database entries in a management system - see Checkpoint 3.4, etc.).
2.7 Allow the author to preserve markup not recognized by the tool. [Priority 2]

Rationale: Markup that is not recognized by an authoring tool may have been added to enhance accessibility. Also, newer XML-based languages, such as XHTML 1.1, allow authors to include multiple languages in a single document, via namespaces. In the future, documents may contain metadata, including accessibility information, in another namespace. Authoring tools must not strip this information when it is encountered.

Techniques: Implementation Techniques for Checkpoint 2.7, Evaluation Techniques for Checkpoint 2.7

Success Criteria:

  1. When unrecognized markup (e.g. external entity, unrecognized element or attribute name) is detected, the tool must query the author for consent to modify the markup. If the author refuses, and the markup cannot be processed, the tool must refuse to open the markup for editing.
  2. All well-formed markup is preserved.
  3. The author is queried for their consent before any unrecognized markup is removed or changed.
  4. The tool does not interfere with content in namespaces it is not able to process.

GUIDELINE 3: Support the author in the production of accessible content

Most authoring tools provide the author with at least some measure of control over the produced content. This control may extend to the level of markup coding (e.g. authoring "by hand") or it may be limited to higher-level content, such as page layout and text content (e.g. WYSIWYG editing). In either case, the intervention of the author has the potential to effect the accessibility of content, either positively, if the author is purposefully following accessibility guidelines, or negatively, if the author is not. In order to manage these effects, authoring tools should support the author by guiding them to follow accessibility authoring practices as they produce that content that involves an element of human judgment or creativity, providing automated or semi-automated checking and correction facilities and by providing high quality accessibility-related documentation.

Guiding the author to produce accessible content:

Conformance with accessibility authoring practices is an authoring constraint that is little different, in principle, from the constraint to produce valid code or grammatical text. Since the role of authoring tools is to facilitate satisfaction of authoring constraints, it is natural that tools should include features to facilitate the process of creating accessible content. For example, tools may assist authors to follow specific practices by suggesting accessible authoring practices or prompting for information that cannot be generated automatically, such as equivalent alternatives (alternate text, descriptions, captions, etc.).

Many authoring tools already allow authors to create documents with little or no need for knowledge about the underlying markup. To ensure accessibility, authoring tools must be designed so that they can (where possible, automatically) identify inaccessible markup, and enable its correction when either the markup is hidden from the author or the author does not know how to correct it.

Authoring tool support for the creation of accessible Web content should account for different authoring styles. Authors who can choose how to configure the tool's accessibility features to support their regular work patterns are more likely to feel comfortable with their use of the tool and be receptive to interventions from the tool. (see guideline 4). For example, some authors may prefer to be alerted to accessibility problems when they occur, whereas others may prefer to perform a check at the end of an editing session. This choice is analogous to that offered in programming environments that allow authors to decide whether to check syntax during editing or at compilation.

3.1 Prompt and assist the author to create accessible content. [Relative Priority]

Rationale: Appropriate assistance should increase the likelihood that typical authors will create WCAG-conformant content. Different tool developers will accomplish this goal in ways that are appropriate to their products, processes and authors.

Techniques: Implementation Techniques for Checkpoint 3.1, Evaluation Techniques for Checkpoint 3.1

Success Criteria:

  1. When the actions of the author risk creating accessibility problems (e.g. image inserted, author typing invalid element into a code view, author initiating a page creation wizard, etc.), the tool must intervene to introduce the appropriate accessible authoring practice. This intervention may proceed according to a user-configurable schedule.
  2. The intervention must occur at least once before completion of authoring (e.g. final save, publishing, etc.).
  3. The authoring tool suggests accessible authoring practices where appropriate.
  4. The authoring tool prompts (Important Definition) the author for information that cannot be generated automatically (e.g. equivalent alternatives (see Checkpoint 3.4).
  5. Prompting may be combined with checking and repair, but must be made available to the author at least once prior to completion of authoring.
3.2 Check for and inform the author of accessibility problems. [Relative Priority] @@ed. Check for accessibility problems@@

Rationale: Authors may not notice or be able to identify accessibility problems.

Techniques: Techniques for checkpoint 3.2, Evaluation Techniques for Checkpoint 3.2.

Success Criteria:

  1. The tool must provide a check (automated check, semi-automated check or manual check) for detecting violations of each requirement of WCAG.
  2. Must provide at least one check (automated, semi-automated or manual) for each requirement of WCAG [WCAG].
  3. The author is made aware of accessibility problems within the document.
3.3 Assist authors in repairing accessibility problems. [Relative Priority]

Rationale: Assistance may expedite the task of correcting some authors' accessibility problems, while other authors may be unable to correct accessibility problems without this help.

Techniques: Techniques for checkpoint 3.3, Evaluation Techniques for Checkpoint 3.3

Success Criteria:

  1. The tool must provide a repair (automated repair, semi-automated repair or manual repair) for correcting violations of each requirement of WCAG.
  2. Context-sensitive help, semi-automated repairs or fully automated repairs are provided for each requirement of WCAG [WCAG].
  3. A typical author is able to successfully correct any identified accessibility problem.

Specific considerations when providing this guidance

3.4 Do not automatically generate equivalent alternatives or reuse previously authored alternatives without author confirmation, except when the function is known with certainty. [Priority 1]

Rationale: Improperly generated alternatives can create accessibility problems and interfere with accessibility checking.

Techniques: Implementation Techniques for Checkpoint 3.4, Evaluation Techniques for Checkpoint 3.4

Success Criteria:

  1. When the author inserts an unrecognized non-text object, the tool must not insert an automatically generated text equivalent (e.g. label generated from the file name).
  2. When the author inserts a non-text object for which the tool has a previously authored equivalent (i.e. created by the author, tool designer, pre-authored content developer, etc.), but the function of the object is not known with certainty, the tool must prompt the author to confirm insertion of the equivalent. However, where the function of the non-text object is known with certainty (e.g. "home button" on a navigation bar, etc.), the tool may automatically insert the equivalent.
  3. When a recognized non-text object is inserted by the tool, the tool must prompt the author to enter an appropriate text equivalent, but an automatically generated default entry may be offered.
  4. Only an alternative that has been explicitly associated with an object is offered as a default entry for the author to approve.
  5. For new non-text objects, the tool prompts the author to enter an appropriate equivalent alternative without providing a generated default entry.
  6. Only an alternative that has been explicitly associated with an object is offered as a default entry for the author to approve.
3.5 Provide functionality for managing, editing, and reusing alternative equivalents for multimedia objects. [Priority 3]

Rationale: Simplifying the initial production and later reuse of alternative equivalents will encourage authors to use them more frequently. In addition, such an alternative equivalent management system will facilitate meeting the requirements of Checkpoint 3.4.

Techniques: Implementation Techniques for Checkpoint 3.5, Evaluation Techniques for Checkpoint 3.5

Success Criteria:

  1. When non-text objects have been previously inserted using the tool, the tool must suggest any previously authored textual equivalents for that non-text object.
  2. The tool recognizes when non-text objects have previously-authored alternative equivalents.
  3. A typical author is able to reuse these previously-authored alternative equivalents when non-text content is reused.
3.6 Provide the author with a summary of the document's accessibility status. [Priority 3]

Rationale: This summary will prompt the author to: improve the accessibility status; keep track of problems; and monitor progress.

Techniques: Techniques for checkpoint 3.6, Evaluation Techniques for Checkpoint 3.6.

Success Criteria:

  1. The tool must provide the author with an option to view a listing of all current accessibility problems.
  2. A listing of the current accessibility problems is available.
  3. From the summary, the typical author will be able to tell whether their content meets the accessibility standard in question.

Promoting accessibility in help and documentation:

Some Web authors may not be familiar with accessibility issues that arise when creating Web content, while others may be authors familiar with these issues, but may not know how the tool can help to address them. Therefore, help and other supplied documentation must include explanations of accessibility problems, and should demonstrate solutions with examples.

3.7 Document all features of the tool that promote the production of accessible content. [Priority 1]

Rationale: Without documention of the features that promote accessibility (e.g. prompts for alternates, code validators, accessibility checkers, etc.) authors may not find or use them.

Techniques: Techniques for checkpoint 3.7, Evaluation Techniques for Checkpoint 3.7.

Success Criteria:

  1. All features that play a role in creating accessible content must be documented in the help system.
  2. All features that help create accessible content are documented in the help system.
  3. A typical author, following a review of help and other supplied documentation will be aware of and able to use features of the tool that promote accessibility.
  4. All markup code examples meets all requirements of WCAG, regardless of the purpose of the example.
  5. Only the WCAG requirements appropriate to code segments of the content section in question are required. For example, no navigation mechanism is required for an example comprised of only one element.
  6. All examples of the authoring tool interface, including screenshots of dialog boxes, code views, etc., included within the documentation must not violate any of the requirements of WCAG, regardless of the purpose of the example. For example, a screenshot of an image properties dialog that has been cropped so as to include a field for a short descriptive text label must ensure a text label is added to that field.
3.8 Ensure that accessibility is modeled in all documentation and help, including examples. [Priority 2]

Rationale: If authors must look somewhere special for information on accessible authoring practices, they may be unlikely to make the effort. Familiarity with these practices will be promoted by their integration.

Techniques: Implementation Techniques for Checkpoint 3.8, Evaluation Techniques for Checkpoint 3.8

Success Criteria:

  1. All examples of markup code and views of the user interface (dialog screenshots, etc.) must meet the requirements of WCAG, regardless of whether the examples are intended to demonstrate accessibility authoring practices.
  2. All markup code examples meet all applicable WCAG requirements. (This includes examples that are not meant to demonstrate accessibility.) For example, it is not required to show a navigation mechanism for an example comprised of only one element.
  3. All authoring tool interface examples, including screenshots of dialog boxes, etc., meet all applicable WCAG requirements. For example, a screenshot of an image properties dialog that includes a field for a short descriptive text label must include a value in that field.

Applicable WCAG requirements are those appropriate to the scope of the example.

3.9 Document the workflow process of using the tool to produce accessible content. [Priority 3]Note: The definition of "workflow" still needs definition.

Rationale: Authors will be more likely to use features that promote accessibility if they understand when and how to use them.

Techniques: Techniques for checkpoint 3.9, Evaluation Techniques for Checkpoint 3.9

Success Criteria:

  1. The documentation must contain suggested content creation workflow descriptions that include how and when to use the accessibility-related features of the tool.
  2. For tools that lack a particular accessibility-related feature, the workflow description must include a workaround for that feature.
  3. The documentation contains sample or suggested workflows which, if followed, are likely to increase the chance of higher levels of WCAG conformance. This should include the name and nature of the features and when and how they should be used.
  4. For tools that lack a particular accessibility-related feature, this workflow strategy will contain workarounds that are likely to achieve the same result.
  5. A typical author should be able to find and understand this workflow documentation.

GUIDELINE 4: Promote and integrate accessibility solutions

When a new feature is added to an existing software tool without proper integration, the result is often an obvious discontinuity. Differing color schemes, fonts, interaction styles, and even software stability can be factors affecting author acceptance of the new feature. In addition, the relative prominence of different ways to accomplish the same task can influence which one the author chooses. Therefore, it is important that creating accessible content be a natural process when using an authoring tool.

4.1 Ensure that accessibility prompting, checking, repair functions and documentation are always clearly available to the author [Priority 1]

Rationale: If the features that support accessible authoring are difficult to find, activate or use, they are less likely to be used. Ideally, these features should be turned on by default.

Techniques: Implementation Techniques for Checkpoint 4.1, Evaluation Techniques for Checkpoint 4.1

See Also: ATAG Checkpoints 3.1, 3.2, and 3.3.

Success Criteria:

  1. If accessibility prompting (see Checkpoint 3.1), checking (see Checkpoint 3.2), and repairing (see Checkpoint 3.3) functions are not already active by default, the mechanism for activating them must be available to the author at all times during authoring and, at most, one level down in the user interface (e.g. in the first level of a drop-down menu).
  2. The configuration mechanism (i.e. preferences, options, etc.) for these accessibility-related functions must be designed so that typical authors searching for the configuration mechanism will be likely to find it and that typical authors performing general configuration tasks will be likely to notice the configuration mechanism.
  3. When these accessibility-related functions are combined with other authoring functions (i.e. one accessibility-related field in a general purpose dialog box), the y must be designed so that typical authors searching for the function will be likely to find it and that typical authors performing other general purpose tasks will be likely to notice the function.
  4. If accessibility prompting (see Checkpoint 3.1), checking (see Checkpoint 3.2), and repairing (see Checkpoint 3.3) functions are not already active by default, the mechanism for activating them must be available to the author: (1) at all times during authoring and (2) at most, one level down in the user interface (e.g. in the first level of a drop-down menu).
  5. The configuration mechanism (i.e. preferences, options, etc.) for these accessibility-related functions must be designed so that (1) authors searching for the configuration mechanism will find it easily and (2) authors performing general configuration tasks will readily notice the configuration mechanism.
  6. When these accessibility-related functions are combined with other authoring functions (i.e. one accessibility-related field in a general purpose dialog box), the design must allow (1) authors searching for the function to find it easily and (2) authors performing the other general purpose tasks to readily notice the function.
4.2 Ensure that the most accessible option for an authoring task is given priority. [Priority 2]

Rationale: Authors are most likely to use the first and easiest options.

Techniques: Implementation Techniques for Checkpoint 4.2, Evaluation Techniques for Checkpoint 4.2

Success Criteria:

  1. When a tool provides a means for markup to be added with a single mouse click or keystroke, that markup must meet the requirements of WCAG unless the markup was authored "by hand".
  2. When an authoring action has several markup implementations (e.g. changing the color of text with presentation markup or style sheets), those markup implementation(s) that meet the requirements of WCAG must be equal to or higher on all of the following scales than those markup implementations that do not meet the WCAG requirements.
    • Prominence of location (in "power tools" such as floating menus, toolbars, etc.)
    • Position in layout (top to bottom and left to right in menus, dialog boxes, etc. )
    • Size of control (measured as screen area)
    • Actions to activate (number of mouse clicks or keystrokes)
  3. When an authoring action does not necessarily demand a particular markup implementation (ex. changing the color of text), the markup implementation(s) that meet the minimum requirements of WCAG must have at least the same user interface visibility and at least the same ease of function activation (in terms of mouse clicks and keystrokes) as markup implementations that do not meet those requirements.
  4. Whenever a tool provides a means for markup (that has not be authored "by hand") to be added into a document by one mouse click or keystroke, that markup must meet the minimum requirements of WCAG.
  5. Accessible documentation is available in the help subsystem.
4.3 Ensure that accessibility prompting, checking, repair functions and documentation are naturally integrated into the overall look and feel of the tool. [Priority 2]

Rationale: Most authors are reluctant to use features that depart from the conventions of a tool.

Techniques: Implementation Techniques for Checkpoint 4.3, Evaluation Techniques for Checkpoint 4.3

Success Criteria:

  1. The mechanisms for accessibility prompting, checking, repair and documentation must be similar to comparable mechanisms in terms the following characteristics:
    • visual design (design metaphors, artistic sophistication, sizes, fonts, colors)
    • operation (degree of automation, number of actions for activation)
    • configurability (number and types of features)
  2. The accessibility-related functionalities do not contrast with analagous functionality in the normal operation of the tool. For example, an accessibility checker is analagous to a spell checker, while a prompt for a accessibility-related label is analagous to a prompt for a document title. The following factors must be considered: (1) Visual Design: Design metaphors, artistic sophistication, sizes, fonts, colours, (2) Operation: The degree of automation, the approximate number of mouse clicks or keystrokes, (3) Complexity: The amount of author instruction required, and (4) Flexibility: The configurability of the functionality and its features.
  3. The separation of accessibility-related functionalities from the normal authoring process, should be minimized.

3. Glossary of Terms and Definitions

Accessibility (Also: Accessible)
Within these guidelines,"accessible Web content" and "accessible authoring tool" mean that the content and tool can be used by people regardless of disability. To understand the accessibility issues relevant to authoring tool design, consider that many authors may be creating content in contexts very different from your own:
  • They may not be able to see, hear, move, or may not be able to process some types of information easily or at all;
  • They may have difficulty reading or comprehending text;
  • They may not have or be able to use a keyboard or mouse;
  • They may have a text-only display, or a small screen.
Accessible design will benefit people in these different authoring scenarios and also many people who do not have a physical disability but who have similar needs. For example, someone may be working in a noisy environment and thus require an alternative representation of audio information. Similarly, someone may be working in an eyes-busy environment and thus require an audio equivalent to information they cannot view. Users of small mobile devices (with small screens, no keyboard, and no mouse) have similar functional needs as some users with disabilities.
Accessibility Information
"Accessibility information" is content, including information and markup, that is used to improve the accessibility of a document. Accessibility information includes, but is not limited to, equivalent alternative information.
Accessibility Problem (Also: Inaccessible Markup)
Inaccessible Web content or authoring tools cannot be used by some people with disabilities. The Web Content Accessibility Guidelines 2.0 [WCAG20] describes how to create accessible Web content.
Accessible Authoring Practice
"Accessible authoring practices" improve the accessibility of Web content. Both authors and tools engage in accessible authoring practices. For example, authors write clearly, structure their content, and provide navigation aids. Tools automatically generate valid markup and assist authors in providing and managing appropriate equivalent alternatives.
Alert
An "alert" draws the author's attention to an event or situation. It may require a response from the author.
Alternative Information (Also: Equivalent Alternative)
Content is "equivalent" to other content when both fulfill essentially the same function or purpose upon presentation to the user. Equivalent alternatives play an important role in accessible authoring practices since certain types of content may not be accessible to all users (e.g., video, images, audio, etc.). Authors are encouraged to provide text equivalents for non-text content since text may be rendered as synthesized speech for individuals who have visual or learning disabilities, as Braille for individuals who are blind, or as graphical text for individuals who are deaf or do not have a disability. For more information about equivalent alternatives, please refer to the Web Content Accessibility Guidelines WCAG 2.0 [WCAG20].
Attribute
This document uses the term "attribute" as used in SGML and XML [XML]: Element types may be defined as having any number of attributes. Some attributes are integral to the accessibility of content (e.g., the "alt", "title", and "longdesc" attributes in HTML).
Auditory Description
An "auditory description" provides information about actions, body language, graphics, and scene changes in a video. Auditory descriptions are commonly used by people who are blind or have low vision, although they may also be used as a low-bandwidth equivalent on the Web. An auditory description is either a pre-recorded human voice or a synthesized voice (recorded or automatically generated in real time). The auditory description must be synchronized with the auditory track of a video presentation, usually during natural pauses in the auditory track.
Authored "by hand"
When the author specifies the precise text string, as by typing into a text editor.
Authoring Tool
Any software or service that authors may use to create or modify Web content. This includes software that enables authors to perform any of the following functions:
1. Text Editing: Authors manipulate plain text data (e.g. markup text, program code, etc.). [Example 1]
2. Symbol-Level Editing: Authors manipulate symbols (not WYSIWYG renderings) that represent low-level functional groups in the underlying plain text data (e.g. symbols in place of markup elements, programming code operations, multi-element placeholder, etc.) .[Example 2]
3. WYSIWYG Editing: Authors manipulate browser-like renderings of the underlying plain text data (e.g. rendered text, images, etc. in place of markup elements). [Example 3]
4. Graphics Editing: Authors manipulate renderings of object-oriented graphics (e.g. rendered lines, etc. in place of markup elements in a drawing program, animation tool stage, etc.). [Example 4]
5. Content Management: Authors exercise control of changes to Web content across whole documents or groups of documents, rather than at the level of individual instances of content (e.g. site building wizards, site management tools, courseware, content aggregators, etc.). [Example 5]
6. Constrained Editing: Authors make highly constrained inputs that are structured and styled according to static templates (e.g. guest books, message boards, etc.). [Example 6]
7. Timeline Editing: Authors manipulate time-dependent Web content (e.g. animation, music, etc.) using a user interface that represents a series of frames. [Example 7]
8. Format Conversion: Authors are assisted in causing Web content encoded in one format to become encoded in another (e.g. saving Web content created in one format in a different format, importing Web content from a different format, etc.) [Example 8]
Captions
"Captions" are essential text equivalents for movie audio. Captions consist of a text transcript of the auditory track of the movie (or other video presentation) that is synchronized with the video and auditory tracks. Captions are generally rendered graphically and benefit people who can see but are deaf, hard-of-hearing, or cannot hear the audio.
Conversion Tool
A "conversion tool" is any application or application feature (e.g.,"Save as HTML") that transforms convert in one format to another format (such as a markup language).
Check for
As used in checkpoint 4.1,"check for" can refer to three types of checking:
  1. In some instances, an authoring tool will be able to check for accessibility problems automatically. For example, checking for validity (checkpoint 2.2) or testing whether an image is the only content of a link.
  2. In some cases, the tool will be able to "suspect" or "guess" that there is a problem, but will need confirmation from the author. For example, in making sure that a sensible reading order is preserved a tool can present a linearized version of a page to the author.
  3. In some cases, a tool must rely mostly on the author, and can only ask the author to check. For example, the tool may prompt the author to verify that equivalent alternatives for multimedia are appropriate. This is the minimal standard to be satisfied. Subtle, rather than extensive, prompting is more likely to be effective in encouraging the author to verify accessibility where it cannot be done automatically.
Document
A "document" is a series of elements that are defined by a markup language (e.g., HTML 4 or an XML application).
Editing View
An "editing view" is a view provided by the authoring tool that allows editing.
Element
An "element" is any identifiable object within a document, for example, a character, word, image, paragraph or spreadsheet cell. In [HTML4] and [ XML], an element refers to a pair of tags and their content, or an "empty" tag - one that requires no closing tag or content.
Inform
To "inform" is to make the author aware of an event or situation through alert, prompt, sound, flash, or other means.
Markup Language
Authors encode information using a "markup language" such as HTML [HTML4], SVG [ SVG], or MathML [MATHML].
Presentation Markup
"Presentation markup" is markup language that encodes information about the desired presentation or layout of the content. For example, Cascading Style Sheets [CSS1], [CSS2] can be used to control fonts, colors, aural rendering, and graphical positioning. Presentation markup should not be used in place of structural markup to convey structure. For example, authors should mark up lists in HTML with proper list markup and style them with CSS (e.g., to control spacing, bullets, numbering, etc.). Authors should not use other CSS or HTML incorrectly to lay out content graphically so that it resembles a list.
Prompt
In this document prompt does not refer to the narrow software sense of a "prompt," rather it is used as a verb meaning to urge, suggest and encourage. The form and timing that this prompting takes can be user configurable. "Prompting" does not depend upon the author to seek out the support but is initiated by the tool. "Prompting" is more than checking, correcting, and providing help and documentation as encompassed in guidelines 4, 5, 6. The goal of prompting the author is to encourage, urge and support the author in creating meaningful equivalent text without causing frustration that may cause the author to avoid access options. Prompting should be implemented in such a way that it causes a positive disposition and awareness on the part of the author toward accessible authoring practices.
Property
A "property" is a piece of information about an element, for example structural information (e.g., it is item number 7 in a list, or plain text) or presentation information (e.g., that it is marked as bold, its font size is 14). In XML and HTML, properties of an element include the type of the element (e.g., IMG or DL), the values of its attributes, and information associated by means of a style sheet. In a database, properties of a particular element may include values of the entry, and acceptable data types for that entry.
Structural Markup
"Structural markup" is markup language that encodes information about the structural role of elements of the content. For example, headings, sections, members of a list, and components of a complex diagram can be identified using structural markup. Structural markup should not be used incorrectly to control presentation or layout. For example, authors should not use the BLOCKQUOTE element in HTML [HTML4]to achieve an indentation visual layout effect. Structural markup should be used correctly to communicate the roles of the elements of the content and presentation markup should be used separately to control the presentation and layout.
Transcript
A "transcript" is a text representation of sounds in an audio clip or an auditory track of a multimedia presentation. A "collated text transcript" for a video combines (collates) caption text with text descriptions of video information (descriptions of the actions, body language, graphics, and scene changes of the visual track). Collated text transcripts are essential for individuals who are deaf-blind and rely on Braille for access to movies and other content.
Transformation
A "transformation" is a process that changes a document or object into another, equivalent, object according to a discrete set of rules. This includes conversion tools, software that allows the author to change the DTD defined for the original document to another DTD, and the ability to change the markup of lists and convert them into tables.
User Agent
A "user agent" is software that retrieves and renders Web content. User agents include browsers, plug-ins for a particular media type, and some assistive technologies.
View
Authoring tools may render the same content in a variety of ways; each rendering is called a "view". Some authoring tools will have several different types of view, and some allow views of several documents at once. For instance, one view may show raw markup, a second may show a structured tree, a third may show markup with rendered objects while a final view shows an example of how the document may appear if it were to be rendered by a particular browser. A typical way to distinguish views in a graphic environment is to place each in a separate window.

4. Acknowledgments

Many thanks to the following people who have contributed through review and comment: Giorgio Brajnik, Daniel Dardailler, Katie Haritos-Shea, Phill Jenkins, Len Kasday, Marjolein Katsma, William Loughborough, Matthias Müller-Prove, Graham Oliver, Chris Ridpath, Gregory Rosmaita, Heather Swayne, Carlos Velasco.

This document would not have been possible without the work of those who contributed to The Authoring Tool Accessibility Guidelines 1.0

5. References

For the latest version of any W3C specification please consult the list of W3C Technical Reports at http://www.w3.org/TR.

[ATAG10]
"Authoring Tool Accessibility Guidelines 1.0", J. Treviranus, C. McCathieNevile, I. Jacobs, and J. Richards, eds., 3 February 2000. This W3C Recommendation is http://www.w3.org/TR/2000/REC-ATAG10-20000203/.
[ATAG10-TECHS]
"Techniques for Authoring Tool Accessibility", J. Treviranus, J. Richards, I. Jacobs, and C. McCathieNevile editors. The latest version is available at http://www.w3.org/TR/ATAG10-TECHS.
[CONFORMANCE]
"Conformance icons for ATAG 1.0". Information about ATAG 1.0 conformance icons is available at http://www.w3.org/WAI/ATAG10-Conformance.
[CSS1]
" CSS, level 1 Recommendation ," B. Bos and H. Wium Lie, editors., 17 December 1996, revised 11 January 1999. This CSS1 Recommendation is http://www.w3.org/TR/1999/REC-CSS1-19990111. The latest version of CSS1 is available at http://www.w3.org/TR/REC-CSS1. Note: CSS1 has been superseded by CSS2. Tools should implement the CSS2 cascade in particular.
[CSS2]
" CSS, level 2 Recommendation ," B. Bos, H. Wium Lie, C. Lilley, and I. Jacobs, editors., 12 May 1998. This CSS2 Recommendation is http://www.w3.org/TR/1998/REC-CSS2-19980512. The latest version of CSS2 is available at http://www.w3.org/TR/REC-CSS2.
[HTML4]
"HTML 4.01 Recommendation," D. Raggett, A. Le Hors, and I. Jacobs, editors., 24 December 1999. This HTML 4.01 Recommendation is http://www.w3.org/TR/1999/REC-html401-19991224. The latest version of HTML 4 is available at http://www.w3.org/TR/html4.
[MATHML]
"Mathematical Markup Language," P. Ion and R. Miner, editors., 7 April 1998, revised 7 July 1999. This MathML 1.0 Recommendation is http://www.w3.org/1999/07/REC-MathML-19990707. The latest version of MathML 1.0 is available at http://www.w3.org/TR/REC-MathML.
[RDF10]
"Resource Description Framework (RDF) Model and Syntax Specification," O. Lassila, R. Swick, editors. The 22 February 1999 Recommendation is http://www.w3.org/TR/1999/REC-rdf-syntax-19990222. The latest version of RDF 1.0 is available at http://www.w3.org/TR/REC-rdf-syntax.
[SVG]
"Scalable Vector Graphics (SVG) 1.0 Specification (Working Draft)," J. Ferraiolo, editor. The latest version of the SVG specification is available at http://www.w3.org/TR/SVG.
[UAAG10-TECHS]
"Techniques for User Agent Accessibility Guidelines 1.0," J. Gunderson, and I. Jacobs, editors. The latest version of Techniques for User Agent Accessibility Guidelines 1.0 is available at http://www.w3.org/TR/UAAG10-TECHS/.
[WCAG20]
"Web Content Accessibility Guidelines 2.0 (Working Draft)," W. Chisholm, G. Vanderheiden, and J. White, editors. The latest version of the Web Content Accessibility Guidelines 2.0 is available at http://www.w3.org/TR/WCAG20/. Note: This document is still a working draft.
[WCAG-REFS]
ATAG 2.0 References to WCAG, J. Treviranus, J. Richards, and M. May, editors.
[WOMBAT-CHECKLIST]
Not available.
[WOMBAT-TECHS]
" Implementation Techniques for Authoring Tools Accessibility Guidelines 'Wombat'," Jutta Treviranus, Charles McCathieNevile, Jan Richards, Matt May. Note: ATAG20-TECHS supersedes this document. .
[ATAG20-TECHS]
" Implementation Techniques for Authoring Tools Accessibility Guidelines 2.0," Jutta Treviranus, Charles McCathieNevile, Jan Richards, Matt May. Note: This document is still a working group draft.
[XML]
"The Extensible Markup Language (XML) 1.0," T. Bray, J. Paoli, C. M. Sperberg-McQueen, editors., 10 February 1998. This XML 1.0 Recommendation is http://www.w3.org/TR/1998/REC-xml-19980210. The latest version of the XML specification is available at http://www.w3.org/TR/REC-xml.

Level Double-A conformance icon, W3C-WAI Web Content Accessibility Guidelines 1.0