Resource guide
3.1.4 Abbreviations
A mechanism must be available to identify the expanded form or meaning of abbreviations.
By Calling All Minds·Last updated April 2026
Success criterion
Conformance level
Enhanced accessibility — beyond the legal minimum.
What it means
Abbreviations and acronyms can confuse users who are unfamiliar with them. For screen reader users, unexpanded abbreviations may be read letter by letter or mispronounced.
A mechanism must exist to allow users to discover the full form. This can be inline expansion on first use, an abbr element with a title attribute, a glossary, or a tooltip.
In practice
Expand abbreviations on their first use in each section: 'Web Content Accessibility Guidelines (WCAG)'.
Use <abbr title="European Accessibility Act">EAA</abbr> to mark up abbreviations with their expansion.
Where many abbreviations are used, link to or include a glossary.
Common failures
- Document that uses 'EAA', 'WCAG', 'ARIA', and 'EN 301 549' without ever expanding them
- Technical report where all abbreviations are used throughout with no expansion or glossary
AXS Audit
AXS Audit checks your site against 3.1.4 and flags issues your team can act on straight away. It covers criteria that automated scanners often miss.