- From: Anne Pemberton <apembert@erols.com>
- Date: Wed, 01 Aug 2001 13:08:46 -0400
- To: Wendy A Chisholm <wendy@w3.org>, w3c-wai-gl@w3.org
- Message-Id: <5.1.0.14.0.20010801130514.00a0dbb0@pop.erols.com>
Wendy, I've been putting some thought to the sufficiency criteria for 3.4, and have written one that starts from scratch ... I also did a little re-write on the benefits so they seem more positive. The new parts are in red, bold & italic so everyone should be able to distinguish them. Hope pasting as a quote doesn't flummox anyone. Comments? Anne >3.4 Supplement text with non-text content. >Definitions >Non-text content is content that is not text, e.g. images, audio clips, >videos, animations, etc. >Benefits >Sounds, graphics, videos and animations can help make concepts presented >in a Web site easier to understand, especially for people with cognitive, >reading, or learning disabilities or those who are unfamiliar with the >language of the text of the site. >"Designers need to be cautious in deciding when to use illustrations. >Reading a picture is probably a learned activity that is easier for some >than others. Some users skip the pictures; others read only the pictures. >Designers must also recognize that visual conventions are not universal >and that individuals develop their own mental schema and expectations in >interpreting visual information. >For a detailed discussion of guidelines pertaining to illustrations, >consult Tufte (1983) and MacDonald-Ross (1977)." Robert W. Bailey, Ph.D., >Human Performance Engineering, 3rd edition. ]\pg 431. >Replace with: >Benefits: >Sounds, graphics, videos and animations are means at the author’s command >to make concepts presented on the web easier to understand. This is >especially so for people with reading, learning, and cognitive >disabilities, or those unfamiliar with the language of the text used on >the site. > >Designers should use care in choosing the illustrations to use on a site. >When possible provide images in a small and a full screen version. Size >images on a page so that needed details are easily noticed. Check visual >effect and add white space to separate elements, and clashing colors. >Minimize the number of animations showing at the same time on a screen. >Balance images and text on a page so a user is not needlessly scrolling or >clicking back and forth to view them together. > >Success criteria >· For any description of a process or of relationships, provide a >graphic equivalent or link to content that contains a graphic equivalent. >· For any page which has a concrete concept as a primary topic, >provide >· a graphic illustration and/or >· an audio clip and/or >· a virtual simulation and/or >· a video and/or >· link to content that contains illustrations >of the concrete concept. A concrete concept is a person, place or thing. >For example, an animal, a plant, or a product. It can also stand for a >class of nouns - cats, birds, computers, mountains, hotel rooms. >· For a page that describes an organization or concept for which >there is a well known symbol or logo, include that symbol or logo in the >content or link to content that contains the symbol or logo. >· For data information, provide a graph, chart, or some other common >visual representation of the data or link to content that illustrates it. >· When referencing sounds, link to a clip of the sound. > > >Replace with: >Success Criteria > >· For every page or major section of text, provide a graphic >equivalent (photo or drawing, sound clip, video clip, or multi-media >presentation) that illustrates the topic, the company or organization >(logo), or the concept/s presented. Until such time as the technology >permits an explicit association between the text content and it’s graphic >equivalent, include the appropriate redundant texts. >· For every page with a topical illustration or logo, the image >should be available to the user on the opening screen of a page. The alt >tag for such illustrations should be “Photo of xxx”, “Logo for XXX”, etc. >· For every page that describes a process or relationships, provide >a graphic equivalent (a series of photos or drawings, one or more sound >clips, a video clip, or a multi-media presentation) that illustrates the >steps or relationships. Until such time as the technology permits an >explicity association between the text steps and the graphic, auditory, or >multi-meida equivalent, include the appropriate redundant texts. >· For every page that describes a concrete person, place or thing, >provide a photo if it is specific, and a generic drawing or clip art if >the person, place or thing is generic. Include an alt tag that identifies >the specific or generic person, place or thing. >· For every page that describes one or more sounds, provide a link >to the sound and use a standard sound file marker to designate the sound >file on the page. If the sound file contains words, these should made >available on the page. >· For every page that include more than a single animation or >element that moves, insure that the animations are distant enough from >each other to avoid distracting people who like animations. >· For every page that includes photographs and detailed drawings >which need to be see in full size, provide two sizes of the image, one >small to be viewed with the text. Attach a link to the picture so the user >can click on the picture for a full-sized view. Don’t forget to add alt >tags to the small image and consider adding a long description from a D link. >· For every page that includes drawings with text, consider using >SVG technology to make the drawing scalable >· For every page that includes video or multi-media, provide a >synchronized script when possible. >
Received on Wednesday, 1 August 2001 13:14:14 UTC