A11ying with Sanna - Web Content Accessibility Guidelines a guide to the accessibility requirements
3 Understandable

3.3.2 Labels or Instructions

Conformance level: A
Criterion released in WCAG version: 2.0

Official description of the success criterion

Labels or instructions are provided when content requires user input.

What to do?

Provide labels or instructions when content requires user input.

Why is it important?

Ensures users understand what is required.

How to take this criterion into account in design?

Avoid designing forms without visible labels. Ensure each label is clear and easy to understand.

Consider adding instructions for any fields that might not be obvious. For example, if the form requires a phone number in a specific format, that should be told to the user as well.

How to take this criterion into account in development?

If a field has an instruction text associated with it, it can be attached to that field using the aria-describedby attribute. In this case, the user using assistive technology will also be aware of the help text when entering the field.

More about this criterion elsewhere