HTML and CSS Reference
In-Depth Information
§ 1194.22 (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.
ThismeansthatitispreferablefortheWebdevelopertouseclient-sideimage
mapsunlessthemapusesashapethattheclient-sidewillnotallow.IftheWebdeveloper
choosestouseserver-sideimagemaps,thedevelopershouldprovidetextalternativesfor
each link on the image map.
§ 1194.22 (g) Row and column headers shall be identified for data tables.
and
§ 1194.22 (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.
You should structure your tables so that they appear in a linear fashion. In other
words, the table content should be displayed one cell at a time, working from left to right
across each row before moving to the next row.
§ 1194.22 (i) Frames shall be titled with text that facilitates frame identification
and navigation.
Although frames are not supported by HTML5, it is important to understand what
the law requires. Nonvisual browsers open frame sites one frame at a time. It is therefore
important that the Web developer gives a name to each frame, and that the name reflects
the contents of that frame. You can use either the title or the id, but because nonvisual
browsers differ in which attribute they use, the Web developer should use both attributes.
§ 1194.22 ( j) Pages shall be designed to avoid causing the screen to flicker
with a frequency greater than 2 Hz and lower than 55 Hz.
Animations on a Web page can be irritating to many people. However, they can
also be quite harmful to people who have certain cognitive or visual disabilities or seizure
disorders. You should therefore ensure that animations fall within the ranges stated, and
you should limit the use of animations when possible. You also should make certain that
necessary page content is available without the animations.
§ 1194.22 (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
pages shall be updated whenever the primary page changes.
Ifyoucannotcomplywiththeother15guidelines,youshouldprovideatext-only
page to display the content of the page. You should also provide an easily accessible link to
thattext-onlyWebpage.
§ 1194.22 (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.
Scripts are often used to create a more interesting and dynamic Web page. You
should ensure that the functionality of the script is still available for any person using
nonvisual browsers.
