- From: Gregg Vanderheiden <gv@trace.wisc.edu>
- Date: Tue, 04 Mar 2008 23:53:11 -0600
- To: w3c-wai-gl@w3.org
- Message-id: <003d01c87e85$32560ef0$0f6fa8c0@NC84301>
Based on last weeks discussion - a revised reorganization is provided below This version pulls language from TEITAC that makes our provisions read a bit better. Changes from our current text that are 1) MEDIA, TEST, SENSORY is broken into three clauses to make it easier to parse and understand [also matches TEITAC better] 2) Audio only and video only are moved to 1.2 which now covers all media alternatives (other than text alternative for descriptive identification) 3) the word "it" in each provision was changed to "non-text content" to make them stand alone better 4) 1.1.2 is moved to 1.2 series where it is now 1.2.9 It is also reworded to match new format but says the same thing. 5) 1.2 series is reworded to talk about audio or video "content in synchronized media" rather than just captions (or descriptions) "for synchronized media". Means the same thing but eliminates an ambiguity. 6) Other changes possible that I don't remember that were discussed last week and in previous proposals. 7) NEW DEFINITIONS are presented at the end. 1.1.1 Non-text Content: All <http://www.w3.org/WAI/GL/WCAG20/#non-text-contentdef> non-text content that is presented to the user has a <http://www.w3.org/WAI/GL/WCAG20/#text-altdef> text alternative that presents equivalent information, except for the situations listed below. (Level A) <http://www.w3.org/WAI/WCAG20/quickref/20071218/Overview.php#qr-text-equiv-a ll> How to Meet 1.1.1 <http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071218/text-equiv -all.html> Understanding 1.1.1 * Controls, Input: If non-text content is a control or accepts user input, then it has a <http://www.w3.org/WAI/GL/WCAG20/#namedef> name that describes its purpose. (See also Guideline 4.1 <http://www.w3.org/WAI/GL/WCAG20/#ensure-compat> .) * Media: If non-text content is media then text alternatives at least provide descriptive identification of the non-text content. (See Guideline 1.2 for additional requirements for media.) * Test: If non-text content is a test or exercise that <http://www.w3.org/WAI/GL/WCAG20/#must-nontextdef> must be presented in non-text format, then text alternatives at least provide descriptive identification of the non-text content. * Sensory: If non-text content is primarily intended to create a <http://www.w3.org/WAI/GL/WCAG20/#sensoryexpdef> specific sensory experience, then text alternatives at least provide descriptive identification of the non-text content. * <http://www.w3.org/WAI/GL/WCAG20/#CAPTCHAdef> CAPTCHA: If the purpose non-text content is to confirm that content is being accessed by a person rather than a computer, then text alternatives that identify and describe the purpose of the non-text content are provided, and alternative forms of CAPTCHA using output modes for different types of sensory perception are provided to accommodate different disabilities. * Decoration, Formatting, Invisible: If non-text content is <http://www.w3.org/WAI/GL/WCAG20/#puredecdef> pure decoration, or used only for visual formatting, or if it is not presented to users, then non-text content is implemented in a way that it can be ignored by <http://www.w3.org/WAI/GL/WCAG20/#atdef> assistive technology. Guideline 1.2 Media: Provide alternatives for media <http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071218/media-equi v.html> Understanding Guideline 1.2 1.2.X Audio-only and Video-Only (Prerecorded): A [text alternative] that presents equivalent information of [prerecorded] [audio-only] and [prerecorded] [video-only] content is provided except when media is already an <http://www.w3.org/WAI/GL/WCAG20/#multimedia-alt-textdef> alternative to text and is clearly labeled as such. (Level A) How to Meet 1.2.1 Understanding 1.2.1 1.2.1 Captions (Prerecorded): <http://www.w3.org/WAI/GL/WCAG20/#captionsdef> Captions are provided for all [prerecorded] [audio] content in <http://www.w3.org/WAI/GL/WCAG20/#synchronizedmediadef> synchronized media except when media is already an <http://www.w3.org/WAI/GL/WCAG20/#multimedia-alt-textdef> alternative to text and is clearly labeled as such. (Level A) How to Meet 1.2.4 Understanding 1.2.4 1.2.2 Audio Description or Full Text Alternative: A <http://www.w3.org/WAI/GL/WCAG20/#fullmultaltdef> full text alternative for synchronized media including any interaction or <http://www.w3.org/WAI/GL/WCAG20/#audiodescdef> Audio description of the [prerecorded] [video] content is provided for <http://www.w3.org/WAI/GL/WCAG20/#synchronizedmediadef> synchronized media except when media is already an <http://www.w3.org/WAI/GL/WCAG20/#multimedia-alt-textdef> alternative to text and is clearly labeled as such. (Level A) How to Meet 1.2.5 Understanding 1.2.5 1.2.3 Captions (Live): <http://www.w3.org/WAI/GL/WCAG20/#captionsdef> Captions are provided for all [live] [audio] content in <http://www.w3.org/WAI/GL/WCAG20/#synchronizedmediadef> synchronized media.. (Level AA) <http://www.w3.org/WAI/WCAG20/quickref/20071218/Overview.php#qr-media-equiv- real-time-captions> How to Meet 1.2.3 <http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071218/media-equi v-real-time-captions.html> Understanding 1.2.3 1.2.4 Audio Description: <http://www.w3.org/WAI/GL/WCAG20/#audiodescdef> Audio description is provided for all [prerecorded] [video] content in <http://www.w3.org/WAI/GL/WCAG20/#synchronizedmediadef> synchronized media (Level AA) <http://www.w3.org/WAI/WCAG20/quickref/20071218/Overview.php#qr-media-equiv- audio-desc-only> How to Meet 1.2.4 <http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071218/media-equi v-audio-desc-only.html> Understanding 1.2.4 1.2.5 Sign Language: <http://www.w3.org/WAI/GL/WCAG20/#sign-languageinterpdef> Sign language interpretation is provided for all [prerecorded] [audio] content in <http://www.w3.org/WAI/GL/WCAG20/#synchronizedmediadef> synchronized media. (Level AAA) <http://www.w3.org/WAI/WCAG20/quickref/20071218/Overview.php#qr-media-equiv- sign> How to Meet 1.2.5 <http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071218/media-equi v-sign.html> Understanding 1.2.5 1.2.6 Audio Description (Extended): <http://www.w3.org/WAI/GL/WCAG20/#extended-addef> Extended audio description is provided for all [prerecorded] [video] content in <http://www.w3.org/WAI/GL/WCAG20/#synchronizedmediadef> synchronized media (Level AAA) <http://www.w3.org/WAI/WCAG20/quickref/20071218/Overview.php#qr-media-equiv- extended-ad> How to Meet 1.2.6 <http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071218/media-equi v-extended-ad.html> Understanding 1.2.6 1.2.7 Full Text Alternative: A <http://www.w3.org/WAI/GL/WCAG20/#fullmultaltdef> full text alternative for synchronized media including any interaction is provided for [prerecorded] <http://www.w3.org/WAI/GL/WCAG20/#synchronizedmediadef> synchronized media. (Level AAA) <http://www.w3.org/WAI/WCAG20/quickref/20071218/Overview.php#qr-media-equiv- text-doc> How to Meet 1.2.7 <http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071218/media-equi v-text-doc.html> Understanding 1.2.7 1.2.9 [was 1.1.2] Live Audio-only: A <http://www.w3.org/WAI/GL/WCAG20/#text-altdef> text alternative is provided that presents equivalent information for [live] [audio-only] content. (Level AAA) How to Meet 1.2.8 Understanding 1.2.8 Definitions: audio the technology of sound reproduction Note: audio can be created synthetically (including speech synthesis), or recorded from real world sounds, or both. audio description narration added to the soundtrack to describe important visual details that cannot be understood from the main soundtrack alone Note 1: Audio description of video provides information about actions, characters, scene changes, on-screen text, and other visual content. Note 2: In standard audio description, narration is added during existing pauses in dialogue. (See also <http://www.w3.org/WAI/GL/WCAG20/#extended-addef> extended audio description.) Note 3: Where all of the video information is already provided in existing audio, no additional audio description is necessary Note 4: Also called "video description" and "descriptive narration." audio-only a time-based presentation that contains only [audio] (no [video] and no interaction) video-only a time-based presentation that contains only [video] (no [audio] and no interaction) live information captured from a real world event and transmitted to the receiver within 30 seconds of the occurrence of the event Note: If information is completely computer generated, it is not live. pre-recorded information that is not [live] synchronized media [audio] or [video] synchronized with another format for presenting information and/or with time-based interactive components, unless the media is an <http://www.w3.org/WAI/GL/WCAG20/#multimedia-alt-textdef> alternative to text which is clearly labeled as such video the technology of moving or sequenced pictures or images Note: video can be made up of animated or photographic images, or both. Gregg -- ------------------------------ Gregg C Vanderheiden Ph.D.
Received on Wednesday, 5 March 2008 05:53:37 UTC