- From: John M Slatin <john_slatin@austin.utexas.edu>
- Date: Wed, 5 Nov 2003 13:00:11 -0600
- To: <w3c-wai-gl@w3.org>
- Message-ID: <C46A1118E0262B47BD5C202DA2490D1A1DFBD1@MAIL02.austin.utexas.edu>
Plain language version of Guideline 1.7 plus success criteria, benefits, and examples This document contains a series of proposals for a "plain language_ rewording of WCAG 2.0 Checkpoint 1.7 with Success Criteria, Examples, and Benefits This is submitted in partial fulfillment of an action item taken by John Slatin, Katie Haritos-Shay, and Doyle Burnett during a call in late September or early October, to generate a plain-language version of WCAG 2. This message is partial in two ways: (1) It addresses only Guideline (now Principle) 1, Checkpoint (now Guideline) 1.7, and the relevant success criteria, examples, and benefits. Other guidelines, etc., will follow. (2) It is not really "plain language," in the sense that this text has not yet been compared to the 1500-word "special lexicon" used by Voice of America (or other similar lexicons). Thus it's actually best understood as an attempt to simplify and clarify. We're still working on the formal plain language issues, but wanted to put this out to start generating discussion. Items labeled "Current wording" are taken from the September document Reorg 4, available at http://www.w3.org/WAI/GL/2003/09/reorg4.html <http://www.w3.org/WAI/GL/2003/09/reorg4.html> . This document was current at the time Katie and Doyle and I took on the action item to attempt a plain language version. Of course the proposed rewordings will need to be correlated with later updates. Current wording for Checkpoint 1.7 1.7 [E3] Foreground content is easily differentiable from background for auditory default presentations. Proposed wording for Guideline 1.7 1.7 [E3] In default auditory presentations, make it easy to distinguish foreground speech and sounds from background sounds. Current wording for Checkpoint 1.7, SC 1 1. audio content does not contain background sounds OR the background sounds are at least 20 db lower than the foreground audio content. Note: A 20 db difference in sound level is roughly 4 times quieter (or louder). Proposed wording for Guideline 1.7, SC 1 1. Audio content does not contain background sounds OR the background sounds are at least 20 decibels lower than the foreground audio content. Note: Background sound that meets this requirement will be approximately four times (4x) quieter than the foreground audio content. Current wording for Best Practice Measures for Checkpoint 1.7 [None listed] Proposed wording for Best Practice Measures for Guideline 1.7 Current wording for Benefits of Checkpoint 1.7 * Individuals with hearing impairments that limit their ability to hear all of the frequencies of speech can make out the words from the sounds they can hear because they are not mixed with residual sounds from the music. Proposed wording for Who benefits from Checkpoint 1.7 (Informative) * People with hearing impairments that limit their ability to hear speech at all frequencies are better able to recognize the main audio content without interference from background noise. * People who do not have access to a text transcript can hear and understand audio presentations. * People with attentional disorders that make it difficult for them to pick out the important sounds in a noisy environment will be better able to hear the difference between what is important and what is not. * People with limited knowledge of the language of the audio content will find it easier to understand spoken material. [js note: I took the liberty of adding some more examples] Current wording for Examples of Checkpoint 1.7 * Example 1: a background image on a page. A background image and text are arranged so that there is no image behind the text or the image is so faint that the difference between the darkest part of the image and the text (which is dark) meets the standard foreground/background contrast requirements. The image behind the text also does not contain lines that are about the same width as the characters so they do not interfere with character recognition. * Example 2: speech over background sounds. Because speech is often naturally mixed with background sounds (movies, live news etc) and cannot be easily removed or separated, captions are provided (under checkpoint 1.2) to make dialog understandable. However not all people can see or read the captions. Where speech is mixed or recorded so that it is at least 20 db above any background sounds people do not need to rely on captions to understand the dialog. Proposed wording for Examples of Guideline 1.7 (Informative) * [Example 1:Text over background image Moved to 1.6 [E2] * Example 1: speech over background sounds. A video clip shows two people talking at a political meeting. In the soundtrack, their dialog is clearly audible and understandable above the buzz of other conversations in the background. [js note: I modified the example (a) to make it concrete and (b) to eliminate the potentially confusing reference to captions. I also added the example below] * Example 2. A Webcast of a live sporting event. A football match is broadcast over the Web in real time. The commentators' description of the action is clearly audible against the background cheers of the spectators. "Good design is accessible design." Please note our new name and URL! John Slatin, Ph.D. Director, Accessibility Institute University of Texas at Austin FAC 248C 1 University Station G9600 Austin, TX 78712 ph 512-495-4288, f 512-495-4524 email jslatin@mail.utexas.edu web http://www.utexas.edu/research/accessibility/ <http://www.utexas.edu/research/accessibility/>
Received on Wednesday, 5 November 2003 14:00:12 UTC