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Section
508 Accessibility Standards for Web Sites
β 1194.22 Web-based intranet and
internet information and applications.
(a) A text equivalent for every non-text element
shall be provided (e.g., via "alt", "longdesc", or in element
content).
(b) Equivalent alternatives for any multimedia
presentation shall be synchronized with the presentation.
(c) Web pages shall be designed so that all
information conveyed with color is also available without color,
for example from context or markup.
(d) Documents shall be organized so they are
readable without requiring an associated style sheet.
(e) Redundant text links shall be provided
for each active region of a server-side image map.
(f) Client-side image maps shall be provided
instead of server-side image maps except where the regions cannot
be defined with an available geometric shape.
(g) Row and column headers shall be identified
for data tables.
(h) Markup shall be used to associate data
cells and header cells for data tables that have two or more
logical levels of row or column headers.
(i) Frames shall be titled with text that
facilitates frame identification and navigation.
(j) Pages shall be designed to avoid causing
the screen to flicker with a frequency greater than 2 Hz and
lower than 55 Hz.
(k) A text-only page, with equivalent information
or functionality, shall be provided to make a web site comply
with the provisions of this part, when compliance cannot be accomplished
in any other way. The content of the text-only page shall be
updated whenever the primary page changes.
(l) When pages utilize scripting languages
to display content, or to create interface elements, the information
provided by the script shall be identified with functional text
that can be read by assistive technology.
(m) When a web page requires that an applet,
plug-in, or other application be present on the client system
to interpret page content, the page must provide a link to a
plug-in or applet that complies with §1194.21(a) through (l).
(n) When electronic forms are designed to
be completed on-line, the form shall allow people using assistive
technology to access the information, field elements, and functionality
required for completion and submission of the form, including
all directions and cues.
(o) A method shall be provided that permits
users to skip repetitive navigation links.
(p) When a timed response is required, the
user shall be alerted and given sufficient time to indicate more
time is required.
Note to §1194.22: 1. The Board interprets paragraphs
(a) through (k) of this section as consistent with the following
priority 1 Checkpoints of the Web Content Accessibility Guidelines
1.0 (WCAG 1.0) (May 5, 1999) published by the Web Accessibility
Initiative of the World Wide Web Consortium:
Note: The following table was adapted from
WebABLE www.webable.com.
The table is an enhanced replication of the table currently located
on the Access Board's Section 508 web page. This table includes
hyperlinks to the individual 508 requirement, the associated
W3C Web Content Accessibility Guideline, and the W3C accessibility
coding technique.
2. Paragraphs (l), (m), (n), (o), and (p) of this section are
different from WCAG 1.0. Web pages that conform to WCAG 1.0,
level A (i.e., all priority 1 checkpoints) must also meet paragraphs
(l), (m), (n), (o), and (p) of this section to comply with this
section. WCAG 1.0 is available at www.w3.org/TR/WAI-WEBCONTENT/
The complete text of the Electronic and Information Technology
Accessibility Standards is available from the Access Board at www.access-board.gov/sec508/508standards.htm
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