Information Technology Reference
In-Depth Information
Table 9.1 Some Options for Addressing Section 508 Guidelines
Section 508 Guideline
Application Design Solution
A text equivalent will be
provided for every nontext
element.
Every image, applet, Flash presentation, video
or audio fi le, etc., will have a descriptive “alt”
tag. Complex graphics will be accompanied
by detailed text descriptions of the
information and conclusions. “Alt” tag
descriptions of hyperlinks should describe the
link destination. Purely decorative graphics
should have very succinct descriptive tags.
Text alternatives for multimedia
shall be synchronized.
Video fi les should have captions, transcripts,
or closed captioning synchronized with audio
content. Audio fi les should have captions or
transcripts.
Interfaces shall be designed to
convey all data without
requiring color discrimination.
Key information should be highlighted using a
means other than color changes. Visually
distinguishing characteristics of data
representations should include captions for
nonvisible review.
Text links will be provided for
each active region of a server-
side image map.
Textual hyperlinks with descriptive tags should
be included for each hot spot in a clickable
server-side image map.
Row and column headers will
be identifi ed in tabular data.
Data tables should have columns and rows
identifi ed using appropriate “alt” tags. Tables
presented for side-by-side visual comparison
should include descriptive tags detailing
comparisons.
Frame titles must facilitate
identifi cation and navigation.
Frame “title” attributes should describe the
frame's content or purpose, to allow rapid
review before drilling down using alternate
accessibility interfaces.
Content will not cause fl ickering
between 2 and 55 Hz.
Highlights, active content, and other screen
elements should not fl ash at a rate between 2
and 55 cycles per second, to reduce the
chance of causing optically induced seizure.
A text-only equivalent must be
provided when there is no other
mechanism for compliance. This
equivalent shall be updated
along with the original.
Text-only alternatives must be provided when
there is no other option, and must include the
same information and functionality as the
original content. Flash-based navigation
systems are a common example, where a
text-only navigation alternative will allow the
navigation capability for alternative interfaces.
The text-only version must be updated along
with the original content version.
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