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
titleattribute to describe each<frame>. - Add the
titleattribute to describe each<iframe>. - Do not add text to decorative
<canvas>elements. - Do not use the
wmodeparameter withtransparentoropaquevalues. - 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
alton each image map<area />tag. - Provide alternative links to
ismapattributes 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
dirattribute 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.
