Some CSS instructions display text and images that are actually invisible to users and tools that do not support stylesheets. For example, when disabling CSS colors or styles, a CSS image (property of background-image) will not be visible while an HTML image (element ) would have been displayed.

Objectives

• Allow users in contexts or styles are not rendered (text browser, screen reader, browser with disabled styles) to access the current information in the form of CSS managed content (background images in particular).
• Improve accessibility of content to readers with disabilities.

Implementation

• Provide a text equivalent for any important content that is only displayed using styles (CSS).
• This applies in particular to information conveyed by a background image, content added before or after an element, or any other visual effect that would disappear if styles were disabled.

Control

• Check the use of CSS :before or elements and CSS background-image.
• The normal display of the relevant page will be compared visually with its rendering after turning off background images.
• The display will be compared with and without background images.