Information images are provided with a text alternative.
Information images can be illustrations (painting, drawing, photo, comics, map, timeline,…label), graphics, data tables. In the case of illustrations, it is important to specify in the alternative text the nature of the document and the description.
Objectives
Allow readers in contexts or images are not visible (synthetic voice, screen reader, immersive reading) to understand the meaning of the images they cannot see.
Implementation
Give each img element related to an alt attribute reproducing the information, a link next to the image playing the same role: in the content of the page, in the context of the image. In the latter case, the alternative can report the presence of this description and return it.
Control
Verify that the alt attribute of each img element concerned reproduces the information conveyed by the image.
Considering the scope and relevance of the description was the case.
Check the understanding in the absence of the image.