2 · Image ALT Attributes and Text Alternative

Web 2.0 Services

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 to 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.

Outcome Score
Acceptable alternative text throughout and use of empty or null alt attributes (e.g., alt="") that AT can ignore. 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=""). 0%
Not applicable N/A


The results of this test are taken into account when calculating accessibility scores for the following disabilities.


The following technique may come in handy when running this test.


This test aims to cover the following section of best practice.

Document Section Heading
WCAG 2.1 1.1 Text Alternatives More Info