Digital book playback devices often allow synthetic voice rendering and some disabled users use screen readers to obtain alternative audio or touch rendering. In both cases, textual alternatives to images are rendered, which may disturb understanding or become irritating in the case of decorative images. In order to avoid increasing playback, it is necessary to correctly fill in the decorative function.
Objectives
Avoid users placed in contexts or images are not visible (synthetic voice, screen reader or immersive playback) disturbed by unnecessary information.
Provide indexing robots with only relevant information.
Improve accessibility of content to readers with disabilities.
Improve content support by search engines and indexing tools
Implementation
Give each img element a blank alt attribute (alt=).
Give each element an attribute (role=presentation)
Control
Please check the arguments of the images that do not convey information necessary for understanding. This can be done in code or thanks to the array of images available in the ACE report