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
Prevent users in contexts where images are not perceptible (text-to-speech, screen readers, or immersive reading) from being disturbed by unnecessary information.
Provide indexing robots with only relevant information.
Improve content accessibility for people with disabilities.
Improve content processing 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 by inspecting the code or by reviewing the image table available in the ACE report.