- What is Web Accessibility?
- Which set of web accessibility standards or guidelines should
I comply with?
- What is appropriate alternate text for purely decorative images?
- How long can an ÂaltÂ attribute be?
- What is the current recommendation for providing long descriptions
for complex graphics?
- What is a Âskip navigationÂ link?
- In addition to including a skip navigation link, how else can
I facilitate page navigation?
- Is it possible to develop an accessible dynamic menu?
- There are many different types of color blindness. How can I
ensure that color blind users can access my site?
- What is wrong with using HTML tables for layout?
- How do I make data tables accessible?
- To make a form accessible, is it enough just to be sure that
form labels appear immediately to the right of the fields they represent?
- Are ÂQuickLinksÂ dropdown lists accessible?
- Is PDF Accessible?
- Can I build an accessible online application using Macromedia
- Are frames accessible?
- Where can I learn more about web accessibility?
Which set of web accessibility standards or guidelines should I comply with?
Web accessibility means making a web page viewable and usable by everyone. View video, "Access for All", for more information.
Which set of web accessibility standards or guidelines should I comply with?
CSULA requires Section 508 standards at a minimum. However, the World Wide Web Consortium (W3C)
has established its own set of Web Content Accessibility Guidelines (WCAG) that contain additional
measures for making pages more universally accessible. Web authors and develops are encouraged
to also comply with the guidelines from W3C.
What is appropriate alternate text for purely decorative images?
If an image is purely decorative and contains no informative content, use
an empty string as the "alt" attribute, i.e., alt="". This technique is widely supported
by screen readers, which respond by ignoring the image.
How long can an ÂaltÂ attribute be?
The HTML specification does not define a maximum length for "alt" attributes.
However, their intended function is to provide short, efficient alternate text so
that users who cannot see an image can access the content presented in the image.
Browsers' and certain assistive technologies' current method of rendering "alt"
attributes reinforces the need to keep them short.
What is the current recommendation for providing long descriptions for complex
In HTML, the "longdesc" attribute was specifically designed to link to a page that describes complex
graphics. Although historically this attribute has not been well supported by assistive
technologies, current and recent versions of most screen reader applications do
What is a Âskip to the content" link?
A "skip to the content" link is a same-page link that allows screen reader users
and users navigating by keyboard to skip past redundant navigation systems and jump
efficiently to the main content of the page, just as a sighted user can do at a
In addition to including a skip to the content link, how else can I facilitate
All web documents should be divided into short sections for readability, and
should be organized using a clear hierarchy of HTML headings and subheadings (i.e.,
<h1>, <h2>, etc.) This helps all users to understand the document contents, but
it especially helps users of screen readers. Most screen readers include functionality
that allows users to jump between headings with a single keystroke, so blind users
can effectively scan the document looking for sections that particularly interest
them, just as sighted users typically do.
Is it possible to develop an accessible dynamic menu?
A variety of experiments have focused on developing accessible dynamic menu
systems. None of the models is fully accessible to all users; most require that
users. Therefore, the only way to ensure that all users have access to secondary
menus is to populate the primary menu items with links that lead users to a separate
page or pages where they can access the secondary menu items.
to users with certain assistive technologies, older browsers, pocket versions of
browsers, text-based browsers such as Lynx or Emacs/W3, or newer browsers that have
scripts disabled to eliminate possible security risks.
There are many different types of color blindness. How can I ensure that
color blind users can access my site?
A variety of tools are available to help with evaluating the accessibility
of color combinations, including a tool that allows users to sample their websites
as they might be viewed by someone with any of three types of color blindness, and
tools that measure whether particular color combinations have sufficient color and
brightness contrast. A general rule is that any information that is communicated
with color (e.g., "fields with red labels are required") should also be communicated
with some mechanism other than color (e.g., bold text, marked with an asterisk).
This way, a user who is unable to perceive color can still access the information.
What is wrong with using HTML tables for layout?
HTML tables were originally intended to be used for presenting tabular data,
not for layout. The W3C discourages the use of tables for layout because they are
striving for a web in which content and structure are completely separate from presentation.
In the W3C's world view, CSS is the vehicle by which presentation and layout are
defined. Browser support for CSS has improved significantly in recent versions,
and growing numbers of sites are migrating over to CSS entirely for positioning.
How do I make data tables accessible?
Data tables are tables used to represent actual tabular data, with rows and
columns of related information. The technique for making data tables accessible
depends on the complexity of the table but may involve any of a combination of TH
and CAPTION elements and/or "summary", "scope", "id", and "headers" attributes.
To make a form accessible, is it enough just to be sure that form labels
appear immediately to the right of the fields they represent?
The key accessibility problem with HTML forms is that screen readers typically
have to guess which label goes with which field. If a form consists solely of text
fields and labels always appear immediately to the right of the fields they represent,
a web author can be reasonably confident that screen readers will read this correctly.
However, confidence goes down as forms become more complex, and accessible markup
must be used in order to prevent screen readers from having to guess.
Are ÂQuickLinksÂ dropdown lists accessible?
A growing number of websites use a single drop-down list of links that takes
the user immediately to a selected link, without requiring that the user press a
Submit button. For people who can't use a mouse because of a visual impairment or
physical disability, these form fields present problems since they automatically
select the first field that a user arrows to and activate that link. The user is
therefore unable to scroll down any farther in the list. The solution is to always
provide a Go button and to avoid using onSelect or onChange events in dropdown lists.
Is PDF Accessible?
With the release of Acrobat 5.0, Adobe unveiled a new type of Portable Document
Format (PDF) called "tagged PDF." It is the only type of PDF that is optimized for
accessibility, including support for alternate text for graphics and an underlying
document structure that resembles HTML. Adobe Acrobat 8 has added new accessibility
features and made improvements to features included in earlier versions. Anyone
still using earlier versions of Acrobat is encouraged to upgrade.
Can I build an accessible online application using Macromedia Flash?
With the release of Flash MX, Macromedia had made significant improvements
to its product's ability to produce accessible content. Using Flash's Accessibility
Panel, developers can assign text to interface elements so that screen reader users
can access them. In some Flash applications, developers can explicitly define a
tab order for keyboard users. Flash accessibility depends on authors to create accessible
content and on assistive technologies to support the accessibility features. Only
a few currently do.
Are frames accessible?
Frames are not in and of themselves inaccessible. Keyboard users and assistive
technology users are able to navigate among the various frames that comprise a web
page. In order to facilitate navigation, each frame must be assigned a title (using
the "title" attribute) that clearly communicates the function of the frame (e.g.,
"Navigation" or "Content"). Also, screen reader users should be provided with clear
instructions on how and where to locate content within the frameset.
Where can I learn more about web accessibility?
You may visit the rest of the pages in our Accessibility
site to find a list of various websites, tips and software.