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This document examines the impact of each checkpoint listed in the User Agent Accessibility Guidelines 1.0. For each checkpoint, we list the disabilities and technologies most affected.
This version of the impact matrix is derived from the 27 August 1999 User Agent Accessibility Guidelines.
This is a Draft W3C NOTE for review by the User Agent Accessibility Guidelines Working Group. It has not been approved for publication as a W3C Note.
A list of current W3C Recommendations and other technical documents can be found at http://www.w3.org/TR.
This document has been produced as part of the Web Accessibility Initiative. The goal of the User Agent Accessibility Guidelines Working Group is discussed in the Working Group charter.
Please send comments about this document to w3c-wai-ua@w3.org.
| In General (Priority 1) | Functional Limitation | Input | Output |
|---|---|---|---|
| 3.1 Ensure that the user has access to document content, including alternative representations of content. | All; especially blindness, low vision, deafness, hard of hearing, cognitive/learning, Photo sensitive (e.g. descriptions of animations) | All | All |
| 3.2 For dependent user agents only. Ensure that the user has access to the content of an element selected by the user. | All; especially blindness, low vision?? | All | All |
| 3.3 For dependent user agents only. Render content according to natural language identification. For unsupported natural languages, notify the user of language changes when configured to do so. | All | All | All |
| 4.5 Allow the user to turn on and off rendering of audio captions. | Deafness, Hard of Hearing, cognitive/learning [Low vision, blindness - to avoid interference] | NA | audio, visual [speech, braille, magnified/ small screen] |
| 12.1 Provide a version of the product documentation that conforms to the Web Content Accessibility Guidelines. | All | All | All |
| 12.2 Ensure that all user agent functionalities that promote accessibility are documented. | All | All | All |
| User Interface (Priority 1) |
Functional Limitation | Input | Output |
| 4.6 Allow the user to turn on and off animated or blinking text. | Blindness, low vision, cognitive/learning, photosensitive | NA | visual, braille, magnified/small screen |
| 4.7 Allow the user to turn on and off animations and blinking images. | Blindness, low vision, cognitive/learning, photosensitive |
NA | visual, braille, speech, magnified/small screen |
| 4.9 Allow the user to turn on and off support for user style sheets. | All | NA | All |
| 4.10 Allow the user to turn on and off support for author style sheets. | All | NA | All |
| 4.11 Allow the user to turn on and off support for spawned windows. | Blindness, low vision, cognitive/learning |
NA | Visual, speech, magnified/small screen |
| 5.1 Allow the user to control font family. | All; especially low vision | NA | visual, magnified/small screen |
| 5.2 Allow the user to control the size of text. | All, especially low vision | NA | visual, magnified/small screen, speech |
| 5.3 Allow the user to control foreground color. | Color deficit, low vision, cognitive/learning |
NA | visual, magnified/small screen |
| 5.4 Allow the user to control background color. | Color deficit, Low vision, cognitive/learning |
NA | visual, magnified/small screen |
| 5.5 Allow the user to control selection highlighting (e.g., foreground and background color). | Color deficit, Low vision, cognitive/learning |
NA | visual, magnified/small screen , speech |
| 5.6 Allow the user to control focus highlighting (e.g., foreground and background color). | Color deficit, Low vision, cognitive/learning |
NA | visual, magnified/small screen , speech |
| 5.14 Allow the user to control speech playback rate. | Blindness, cognitive/learning, hard of hearing | NA | Speech |
| 8.1 Allow the user to navigate viewports (including frames). | All | All | All |
| 8.2 For user agents that offer a browsing history mechanism, when the user returns to a previous view, restore the point of regard in the viewport. | All | NA | All |
| 9.1 Provide a mechanism for highlighting and identifying (through a standard interface where available) the current viewport, selection, and focus. | All; (or visual, magnified/small screen??) |
NA | All (Does highlighting imply visual only interfaces?) |
| Keyboard Support (Priority 1) | Functional Limitations | Input | Output |
| 2.1 By default and without additional customization, ensure that all functionalities offered by the user agent are accessible using the keyboard. | Blindness, physical, low vision |
keyboards, voice | NA |
| 2.2 Provide documentation on default keyboard commands and include with user agent documentation and/or user help system. | All; especially blindness, physical, low vision |
keyboards, voice | NA |
| 2.3 Provide information to the user about the current keyboard configuration. | All: especially blindness, physical, low vision |
keyboards, voice | NA |
| Device Independence (Priority 1) | Functional Limitations | Input | Output |
| 1.1 Ensure that all functionalities offered through the user interface may be operated through standard input device APIs supported by the operating system. | All | All | NA |
| 1.2 Ensure that the user can interact with all active elements of a document in a device independent manner. | All | All | All |
| 1.3 Ensure that the user can install the user agent software in a device independent manner. | All | All | All |
| 1.4 Ensure that the user can configure the user agent in a device independent manner. | All | All | All |
| 1.5 Ensure that the user can access user agent documentation in a device independent manner. | All | NA | All |
| 1.6 Ensure that all messages to the user (e.g., warnings, errors, etc.) are available through standard output device APIs supported by the operating system. | All | All | All |
| For Tables (Priority 1) | Functional Limitation | Input | Output |
| 8.3 For dependent user agents only. Allow the user to navigate just among table cells of a table (notably left and right within a row and up and down within a column). | Blindness, low vision, physical?? |
keyboards, voice | speech, braille, magnified/small screen |
| 9.8 For dependent user agents only. Provide access to header information for a selected table cell. | Blindness, low vision, physical |
NA?? | speech, braille, magnified/small screen |
| For Images, Animations, and Image Maps (Priority 1) | Functional Limitations | No | N/A |
| 4.1 Allow the user to turn on and off rendering of images. | Low vision, cognitive/learning, blindness |
NA | Visual, magnified/small screen, speech |
| 4.2 Allow the user to turn on and off rendering of background images. | Blindness, low vision, cognitive/learning | NA | Visual, magnified/small screen, speech |
| For Synchronized Multimedia (Priority 1) | Functional Limitations | No | N/A |
| 3.4 Provide time-independent access to time-dependent active elements or allow the user to control the timing of changes. | All | All | All |
| 3.7 Allow the user to specify that description tracks (e.g., caption, auditory description, video of sign language, etc.) be rendered at the same time as audio and video tracks. | Blindness, low vision, deafness, hard of hearing, cognitive/learning | NA | visual, magnified/small screen, speech, braille |
| 3.8 If a technology allows for more than one description track (e.g., caption, auditory description, video of sign language, etc.), allow the user to choose from among the tracks. | Blindness, low vision, deafness, hard of hearing, cognitive/learning (or All?? | NA | visual, magnified/small screen, speech |
| 3.9 If a technology allows for more than one audio track, allow the user to choose from among tracks. | All?? | NA | Audio |
| 4.3 Allow the user to turn on and off rendering of video. | Blindness, low vision, cognitive/learning |
NA | Visual, magnified/small screen, speech |
| 4.4 Allow the user to turn on and off rendering of sound. | All | NA | visual user agent with sound, audio, speech |
| 5.8 Allow the user to control video frame rates. | Low vision, cognitive/learning, photosensitive | NA | visual, magnified/small screen |
| 5.9 Allow the user to control the position of audio captions. | Deafness, Hard of hearing, cognitive learning, low vision | NA | visual, magnified/small screen |
| 5.11 Allow the user to control audio playback rate. | All; Blindness, low vision, cognitive learning | NA | Audio |
| For Events, Applets, and Scripts (Priority 1) | Functional Limitations | Input | Output |
| 4.8 Allow the user to turn on and off support for scripts and applets. | All | Akll | All |
| 10.1 Provide information about document and viewport changes (to users and through programming interfaces). | Blindness, low vision?? | NA | speech, magnified/small screen |
| For Standards and Conventions (Priority 1) | Functional Limitations | Input | Outupt |
| 6.1 Use and provide accessible interfaces to other technologies. | All | All | All |
| 6.2 Provide programmatic read and write access to user agent functionalities and user interface controls (including selection and focus) by using operating system and development language accessibility resources and conventions. | All | All | All |
| 6.3 Notify dependent user agents of changes to the document and user interface controls (including selection and focus) by using operating system and development language accessibility resources and conventions. | All | All | All |
| 6.4 For graphical desktop browsers only. Comply with W3C Document Object Model specifications and export interfaces defined by those specifications. | All | All | All |
| 7.1 Implement the accessibility features defined for supported specifications. | All | All | All |
| In General (Priority 2) | Functional Limitations | Input | Output |
|---|---|---|---|
| 3.5 When no alternative text representation has been specified, indicate what type of object is present. | Blindness, low vision | NA | Speech, magnified/small screen |
| 8.4 Allow the user to navigate just among all active elements in the document. | All | All | All (or NA??) |
| 8.5 Allow the user to search for rendered text content, including alternative text content. | All, especially blindness, low vision, cognitive learning | NA | All, especially speech, magnified/small screen, braille, (audio - closed captions??) |
| 8.6 Allow the user to navigate the document structure. | Blindness, low vision, phyiscal (cognitive/learning??) | keyboards, voice | visual, speech, braille, magnified/small screen |
| 9.4 Describe a selected element's context within a document (e.g., numerical or relative position). | Blindness, low vision | keyboard, voice | speech, braille, magnified/small screen |
| 12.3 Describe product features known to promote accessibility in a section of the product documentation. | All | NA | All |
| User Interface (Priority 2) | Functional Limitations | Input | Output |
| 5.15 Allow the user to control speech volume, pitch, gender and other articulation characteristics. | Blindness, low vision, cognitive/learning, Hard of hearing | NA | Speech |
| 9.3 For dependent user agents only. Allow the user to view a document outline constructed from its structural elements (e.g., from header and list elements). | Blindness, low vision, (cognitive learning??) | NA | visual, speech, braille, magnified/small screen |
| 10.2 Ensure that when the selection or focus changes, it is in the viewport after the change. | All | NA | Visual, magnified/small screen |
| 11.1 Allow the user to configure the user agent in named profiles that may be shared (by other users or software). | All | All | All |
| Keyboard Support (Priority 2) | Functional Limitations | Input | Output |
| 2.4 Allow the user to configure the keystrokes used to activate user agent functionalities. Wherever possible, allow single key activation of functions. | Blindness, low vision, physical | Keyboards, voice | NA |
| 2.5 Allow the user to turn on and off author-specified keyboard configurations. | Blindness, low vision, physical | Keyboards, voice | NA |
| 2.6 Use platform conventions to indicate which keys activate which user agent functionalities. | All | Keyboards, voice | All (Are there conventions for non-visual user agents???) |
| 2.7 Avoid default keyboard configurations that interfere with system conventions. | All | Keyboards, voice | NA |
| For Links (Priority 2) | Functional Limitations | Input | N/A |
| 9.5 For a selected link, indicate whether following the link will involve a fee. | All??; especially blindness, low vision, cognitive/learning | NA | All?? |
| For Frames (Priority 2) | Functional Limitations | Input | N/A |
| 4.12 Allow the user to turn on and off rendering of frames. | Blindess, low vision, cognitive/learning, (physical?? -efficiency) | keyboard, voice | magnified/small screen, speech, braille |
| 5.16 When new windows or user interface components are spawned, allow the user to control window size and position. | Low vision?? | NA | visual, magnified/small screen |
| 9.2 For dependent user agents only. Provide the user with information about the number of viewports. | Blindness, low vision |
NA | speech, braille, magnified/small screen |
| For Forms (Priority 2) |
Functional Limitations | Input | N/A |
| 9.10 Provide the user with access to any label explicitly associated with a form control. | Blindness, low vision | NA | speech, braille, magnified/small screen |
| 10.6 Prompt the user to confirm any form submission not explicitly initiated by the user. | Blindness, low vision, physical?? | All | All?? |
| For Images, Animations, and Image Maps
(Priority 2) |
Functional Limitations | Input | N/A |
| 5.7 Allow the user to control animation rate. | Low vision, cognitive/learning, photosensitive | NA | visual, magnified/small display |
| For Synchronized Multimedia (Priority 2) |
Functional Limitations | Input | N/A |
| 5.10 Allow the user to start, stop, pause, and rewind video. | All | NA | visual |
| 5.12 When the user agent renders audio natively, allow the user to control the audio volume. | All | NA | Audio |
| 5.13 Allow the user to start, stop, pause, and rewind audio. | All | NA | Audio |
| For Standards and Conventions (Priority 2) | Functional Limitations | Input | N/A |
| 6.5 For graphical desktop browsers only. Provide programmatic exchange of information in a timely manner. | All | All | All |
| 6.6 Follow operating system conventions and accessibility settings. In particular, follow conventions for user interface design, default keyboard configuration, product installation, and documentation. | All | All | All |
| 7.2 Support appropriate W3C Recommendations. | All | All | All |
| In General (Priority 3) | Functional Limitations | Input | Output |
|---|---|---|---|
| 3.6 When alternative text has been specified explicitly as empty (i.e., an empty string), render nothing. | Blindness, low vision, cognitive/learning | NA | All |
| 8.7 Allow the user to configure structured navigation. | Blindness, low vision, cognitive/learning?? | All | All |
| 9.7 Provide a mechanism for highlighting and identifying (through a standard interface where available) active elements of a document. | blindness, low vision, physical | NA | All |
| 10.4 When loading a resource (e.g., document, video clip, audio clip, etc.) indicate what portion of the resource has loaded and whether loading has stalled. | All; especially blindness, low vision?? | ||
| 10.5 Indicate the relative position of the viewport in a resource (e.g., the percentage of the document that has been viewed, the percentage of an audio clip that has been played, etc.). | All | NA | All |
| User Interface (Priority 3) | Functional Limitations | Input | Output |
| 4.13 Allow the user to turn on and off author-specified page forwards that occur after a time delay and without user intervention. | Blindness, low vision |
NA | All |
| 4.14 Allow the user to turn on and off automatic page refresh. | Blindness, low vision | ||
| 9.11 Maintain consistent user agent behavior and default configurations between software releases. Consistency is less important than accessibility and adoption of system conventions. | All | All | All |
| 11.2 Allow the user to configure the graphical arrangement of user interface controls. | Physical, low vision, blindness | NA | Visual, magnified/small screen |
| Keyboard Support (Priority 3) | Functional Limitations | Input | Output |
| 2.8 Provide a default keyboard configuration for frequently performed operations. | All; especially blindness, low vision, physcial | keyboards, voice | NA |
| For Links (Priority 3) | Functional Limitations | Input | Output |
| 9.6 For a selected link, provide information to help the user decide whether to follow the link. | All; especially blindness, low vision | NA | All |
| For Tables (Priority 3) | Functional Limitations | Input | Output |
| 9.9 For dependent user agents only. Indicate the row and column dimensions of a selected table. | Blindness, low vision | NA | speech, braille |
| For Events, Applets, and Scripts (Priority 3) |
Functional Limitations | Input | Output |
| 10.3 Allow the user to selectively turn on and off notification of common types of document and viewport changes. | Blindness, low vision?? |
NA | ??? |