A.22 WCAG 2.1 Success Criterion 3.1.3 − Unusual Words

If words or phrases are used in an unusual or restricted way, including unusual expressions or jargons, ensure there is a way for users to identify the corresponding definitions. One example of how this can be done is to make sure the expanded version of an acronym is explained for screen readers.

Before Rectification

In the example above, users could not identify the definition of the term "web accessibility".

After Rectification

In this example, some words are linked to a glossary. This is a good method to ensure all users understand the unusual terms.

WCAG 2.1 Reference:

https://www.w3.org/WAI/WCAG21/Understanding/unusual-words