14. Additional rules for compliance
The following Success Criteria of the Web Content Accessibility Guidelines (WCAG) were not covered in this manual, because either rarely applicable in a web project or because there are not a priority for users.
To comply with level A (WCAG 2.0)
- Add the
title
attribute to describe each<frame>
. - Add the
title
attribute to describe each<iframe>
. - Do not add text to decorative
<canvas>
elements. - Do not use the
wmode
parameter withtransparent
oropaque
values. - Group related options in
<select>
boxes with<optgroup>
. - Indicate the language of each downloadable document that is in a foreign language.
- Indicate the reading direction
dir="ltr"
(left to right) ordir="rtl"
(right to left) on the<html>
elements. - Populate the
alt
on each image map<area />
tag. - Provide alternative links to
ismap
attributes as a backup. - Provide alternatives to graphical CAPTCHA or find a non graphical kind of CAPTCHA.
- Provide a text alternative to all multimedia (
<video>
,<audio>
,<object>
, etc.). - Provide text alternatives to informative
<canvas>
elements or add links to text alternatives. - Tag block level quotations with
<blockquote>
. - Tag inline quotations with
<q>
. - Use the
dir
attribute to indicate a change of direction in the body of a document.
To comply with level AA (WCAG 2.0)
No additional requirements for level AA (WCAG 2.0).
To comply with level AAA (WCAG 2.0)
- Ensure that lines are no longer than 80 characters when the user reduces the browser window size.
- Ensure that no horizontal scroll bar is needed even when text is increased to 200%.
- Limit line length to 80 characters, regardless of text size.
- Provide line spacing (leading) at least a space-and-a-half within paragraphs.
- Provide paragraph spacing at least 1.5 times larger than the line spacing.
- Tag abbreviations with
<abbr<
. - Tag definition lists with
<dfn<
. - The link context can be determined from the link text itself without the title attribute.