Access To Electronic Resources
- World Wide Access: Accessible Web Design
- Meet the Speakers in the Videotape -- World Wide Access: Accessible Web Design
- cannot see graphics
- cannot hear audio
- have difficulty with unorganized sites
- use older equipment, slow connections
- use adaptive technology
The development of sophisticated multi-media electronic and World Wide Web resources has extended the reach of computers. Increasingly, however, these resources are not fully accessible to people with some types of disabilities. For example, screen reader software with a speech synthesizer used by a student who is blind cannot interpret tables, graphics, or video clips.
Some people cannot see graphics because of a visual impairment or cannot hear audio because of a hearing impairment. Some have difficulty when screens are unorganized, inconsistent, and cluttered and when descriptions and instructions are unclear. These difficulties may occur because they have learning disabilities, speak English as a second language, or are younger than the average user. Other people use older equipment, have slow connections or modems that limit their access to multimedia features.
As more information is delivered using computer and network technologies, schools and businesses play an increasingly important role in ensuring access to electronic information resources for all potential interns and employees.
When evaluating the accessibility of electronic resources, remember to consider online catalogs; career and cooperative education resources; electronic indexes and full text resources such as encyclopedias, available through stand-alone stations or networked terminals; and Internet resources on the World Wide Web.
Accessibility should also be considered when purchasing new electronic resources for your career services office. Ask the vendor if the product has been tested for accessibility and, specifically, if the product is compatible with screen reading software. Develop a policy that electronic products in your office be reviewed for accessibility before purchase.
Electronic resources designed or developed in-house, such as career services and cooperative education Web pages, online catalogs, and local digital library projects, should be developed with universal access as a goal. Accessibility guidelines should be incorporated into Web page standards.
Then, as a backup, make it a priority to buy and develop accessible resources. Be prepared to assist people with electronic resources that they cannot access independently.Web Accessibility Initiative (WAI) of the World Wide Web Consortium (W3C). Contact information can be found in the Computing Resources section of this notebook.
Design of products and environments to be usable by all people, without the need for adaptation or specialized design.
Typically, organizations design their electronic services for the average user. Universal design means that you design them for people with a broad range of abilities and disabilities. The Trace Research and Development Center has defined universal design as: "The design of products and environments to be usable by all people, to the greatest extent possible, without the need for adaptation or specialized design."(http://www.trace.wisc.edu/text/univdesn/ud_princ/ud_princ.html)
- equitable use
- flexible use
- simple and intuitive use
- information duplicated in several formats
- low physical effort
Universal design principles can be applied to both facilities and tools. They are especially appropriate to consider when designing electronic resources, including online catalogs, educational software, and electronic reference sources in CD-ROM or other formats, or on the Internet. Adapted from a listing by the Trace Center, here are some general guidelines to consider in designing an electronic resource.
- Design the resource so that it can be used by anyone. Provide the same means of use for all users -- identical when possible; equivalent when not. Avoid segregating or stigmatizing any potential users.
- The resource should be flexible in the ways that it can be used, accommodating a wide range of individual preferences and abilities. Provide choice in methods of use, for example, accommodate both right- and left-handed access.
- The design should be simple, allowing the resource to be used with minimal training. The resource should be easy to understand, regardless of the user's age, experience, knowledge, language skills, or current level of concentration.
- Information should be provided redundantly. The variety of formats included should accommodate people with visual, hearing, and other impairments. Use several different modes (e.g., pictures, text) to provide essential information. Make the resource compatible with current adaptive computer technologies.
- Design the resource so that minimal physical effort is required to operate it.
In the videotape presentation, World Wide Access, individuals with disabilities share access problems and solutions. At the end of the video, design features for making Web pages accessible are listed. These recommendations are covered in the handout titled World Wide Access: Accessible Web Design. Watch the videotape and review the publication.
The first principle to remember is to maintain a simple, consistent page layout throughout your site. Much of the power and appeal of the Web comes from the fact that it presents information in a variety of formats while also organizing that information through hypertext links. Designing a well organized site with a consistent design makes it easier for visitors to find the information they need. Following this guideline will especially assist people with learning disabilities who have difficulty following disorganized presentations.
consistent page layout.
Think about the physical effort needed to use your site. Remember that small buttons marking links can be difficult targets for visitors with mobility impairments that result in restricted hand movements. Larger buttons make it easier for all visitors to select the links on your page. Along with a consistent page layout, it is important to keep backgrounds simple and make sure there is enough contrast.
simple with enough
People with low vision or color blindness, or those using black and white monitors may have difficulty reading information at sites with busy backgrounds and dark colors. Many background images and colors obscure text and make reading difficult. Make sure that there is enough contrast between your text and the background of the page. Choose background, text, and link colors carefully, and always test your site with both black and white and color monitors. Following this guideline will aid visitors with low vision and those with learning disabilities who may find busy backgrounds and moving features from page to page confusing.
so they can be understood
out of context.
Visitors who use screen reading software can adjust their software to read only the links on a page. For this reason, links should provide enough information when read out of context. For example, never use "click here" as a link, or next to a graphic used as a link. Make links descriptive enough so that they are understood out of context.
Hypertext Markup Language (HTML) is the standardized code used to create Web sites. The code works with tags that tell a Web browser where to find and how to display your information. HTML was designed to be a universal format outside the bounds of proprietary software and computer languages. The World Wide Web Consortium (W3C) specifies what is standard HTML with the intent of maintaining a language compatible with many platforms and browsers.
The universal format of the World Wide Web meets the equitable and flexible principles of universal design. However, many people like to add new and non-standard features to add flash to their Web pages. This obstructs the original purpose of a world-wide standard and the open communication that it allows and encourages.
Using standard HTML tags will ensure that your content can be accessed by all browsers used by visitors to your site. Avoid tags, such as <BLINK> that are not supported by all Web browsers. Another example of non-standard tags are frame tags. Frames often present logistical nightmares to text-based screen reading software. Evaluate whether frames are truly necessary at your site. When you use non-standard tags, you are likely blocking someone from your information.
Notify your users that you are concerned about accessibility by including a statement about accessibility on your page. Encourage site visitors to notify you with their accessibility concerns. For example, the DO-IT home page includes this statement:
Some people have advocated the use of alternative text versions of Web sites that are graphic-intensive. However, this adds a great deal of maintenance time and complexity as two versions must be updated. The maintenance time increases exponentially for organizations that are required, or that choose to provide their sites in multiple language versions. Make every effort to create the original version in an accessible format. Remember, the first principle of universal access is equitable use, so avoid segregating users of your electronic resources based on their ability, connection speed, or type of hardware and software they use. Below are guidelines for providing alternative text for various types of visual features.
To start out, always include short, descriptive ALT attributes for graphical features on your page. What is an ALT attribute? An ALT attribute is an HTML code used with the IMG tag that is used to give alternative text information for graphical features. The alternative text helps the visitor understand what is on the page even if they are using a text browser or if they have image loading turned off in their graphical browser.
The bolded text in the following example of HTML code shows what an ALT attribute looks like. An ALT attribute always works within an image or graphical HTML tag.
<HTML> <HEAD> <TITLE>DO-IT Program</TITLE></HEAD> <BODY><IMG SRC="./doitlogo.large.gif" ALIGN=MIDDLE ALT="[DO-IT LOGO]"> <H1>DO-IT at the University of Washington</H1>
In some cases where a graphic provides no additional information, the ALT attribute can be used with a null value ("") to eliminate clutter. ALT attributes for graphical bullets can simply be asterisks.
<IMG SRC="./dec.gif" ALIGN=MIDDLE ALT=""> <IMG SRC="./bullet.gif" ALIGN=MIDDLE ALT="*">For example, when a sighted visitor views the DO-IT home page at http://www.washington.edu/doit/ with a graphical browser, he will see the DO-IT logo.
When a user who is blind visits, his voice output program will read [DO-IT LOGO] because DO-IT staff used this text as an ALT attribute for the graphic. This gives him a clear idea of what is on the page. In addition, any visitor coming to the site using a text-based browser will understand that there is a logo there instead of the more ambiguous "image" that is the default result when no ALT attribute is used. ALT attributes should be short and simple (less than five words) as browsers sometimes have difficulty with long ALT attributes. This example can also be used to explain the difference between text and words embedded in a graphic. Web designers sometimes embed text in graphics so that they can incorporate color, fancy fonts, and other design elements into the display. It is important to differentiate between text, which screen readers can access, and words that are images, which screen readers cannot read. In the DO-IT logo, "DO-IT" is a graphic image. DO-IT staff include "DO-IT" in the ALT attribute so that the DO-IT name is displayed by a text browser and thus read by a speech synthesizer.
Another principle of universal design is to use menu alternatives for image maps (also called ISMAPS) to ensure that the embedded links are accessible. An image map is a picture on which parts of the picture can be clicked to find a link to another page. For example, a site with information on state trivia presents a map of the United States. A visitor can click on Washington to find out the state bird, song, insect, flower, and other facts. But if the Web page developer has not included an alternative menu, visitors using text-based browsers can be totally blocked from the site, or sent on a wild goose chase clicking unlabeled links that lead them in circles.
The HTML coding in this example does not include an alternative menu for the image map.
<HTML> <HEAD> <TITLE>States Trivia</TITLE> </HEAD> <BODY> <A HREF="images/home.map"> <IMG SRC="images/states.jpg"ismap></A> </BODY> </HTML>
When viewed through a graphical browser, such as Netscape, a picture of a map of the
United States appears and the visitor can choose information by state. But, when a visitor
using a text-based browser visits
the site, what he sees is this:
At this point the visitor is stuck as text-based browsers will not interpret the hypertext links embedded in the image map. His only option is to back out of the site. A visitor who uses a text-based browser, perhaps because he is blind, cannot get to your information.
The accessibility of image maps is dependent on the server software used at a Web page site. If ALT attributes are included for every hyperlink in an image map, some server programs can pull the hyperlink information from the image map and present it in menu format for text-based browsers. However, many Web servers do not have this capability. If this support is not available to you, you can always make the image map accessible by adding a separate navigation menu, or listing of hypertext links, above or below the image map.
Using ALT attributes and alternative menus help all of your visitors navigate through your site. The next principles we will discuss help your visitors understand the content in non-text, graphical features on your page. Including ALT attributes is sufficient for logos and graphics that are not critical to the information content of the page. But if the graphics provide information beyond this, adding captions and transcriptions is important for those who cannot see your page because they are using a text-based browser, possibly because they are blind. Include descriptive captions for photographs and pictures. Describe images in enough detail so that a visitor who cannot see the pictures will understand the content that they add to the page.
If you present information in an image format, such as a scanned-in image of a page of a manuscript, be sure to also include a transcription of the manuscript in a straight text format. Remember, words embedded in an image are not accessible to those using a voice output system. This aids a wide variety of visitors, including those with visual impairments, users who speak English as a second language, and those with learning disabilities. Again, think redundancy.
Multimedia and audio formats can present barriers to people with hearing impairments as well as for people with less sophisticated computer systems. Provide captioning and transcriptions for spoken materials so these visitors have an alternative method of accessing this information.
Use special features such as forms, data-bases and plug-ins with care. Always test forms and databases with a text-based browser. Include an electronic mail address and other contact information for those who cannot use the form or database.
Use features that require plug-ins, mini programs that run within a browser, with care. Not all people have the high-end equipment needed to download and run plug-ins. In addition, content presented using plug-ins is not accessible through text-based Web browsers. As the software is developed, applets (such programs created with JAVA) and plug-ins (such as Adobe Acrobat) may provide adequate accessibility features. However, to ensure that people with visual and hearing impairments can access your information, provide the content from these programs in other, text-based formats.
Part of testing your Web site includes running it against an HTML validator program. These programs compare the HTML at your site with the rules of standard HTML. They then provide a report listing errors and non-standard tags. Some validators check specifically for accessibility. Try using an accessibility validation site which performs a diagnostic on your pages and points out parts that could be inaccessible. For example, Bobby is an easy-to-use program to find HTML compatibility problems that prevent pages from displaying correctly on different Web browsers. Bobby specifically highlights accessibility problems. Bobby was created at CAST (Center for Applied Special Technology). Its URL is http://www.cast.org/bobby/.
SummaryWhether you are developing electronic resources or designing a computer facility for your career services office or business, apply universal design principles to maximize access. In particular, consider these accessible Web design principles when developing Web pages.
- Simple, consistent page layout.
- Simple backgrounds with enough contrast.
- Standard HTML.
- Note about accessibility.
- Text alternatives for graphical features.
- Use special features with care.
- Test Web pages with variety of browsers.
- Maintain a simple, consistent page layout.
- Keep backgrounds simple. Make sure there is enough contrast.
- Use standard HTML.
- Include a note about accessibility.
- Provide text alternatives (ALT attributes, captions, alternative menus, transcriptions)
for graphical features.
- Test and use special features with care.
- Test your Web pages with a variety of browsers.
Career services offices and businesses have a moral and legal responsibility to make computing resources accessible to everyone, including those with disabilities. They must provide accessible buildings, computers, and electronic resources. You should also demand from vendors that products you purchase are accessible to individuals with a variety of disabilities.