2 · Content Description and Text Alternatives
Images need to have what is commonly known as an 'alt-tag' or text alternative, so that a screen reader user can hear an image description. Some screen readers will read the file name or some say 'image' if the attribute is omitted. The alt-tag should be appropriate for the content and succinct. Text should be accessible for text-to-speech tools and screen-readers so that it is read aloud accurately and intelligibly.
Outcomes and Scores
This test has 5 possible outcomes.
|Acceptable alternative text throughout and use of empty or null alt attributes (e.g., alt="") that AT can ignore. For UI components with labels, accessible name contains a part of the visible name and mapping visible name to the right accessible name.||100%|
|Alternative text offered but examples lack brevity or clarity e.g. image of duck.||67%|
|Inadequate/sparse alternative text even to actual website images not just those added by users. Inappropriate use of null alt attributes (e.g., alt="").||33%|
|None, detrimental to understanding of content. No option to add alt-tag if uploading image to web pages. Lack of use of null alt attributes (e.g., alt=""). Accessible name does not contain the visible label text for User Interface components with labels.||0%|
The results of this test are taken into account when calculating accessibility scores for the following disabilities.
The following techniques may come in handy when running this test.