This article provides practical advice on how to write your web content so that it conforms to the success criteria outlined in the Understandable principle of the Web Content Accessibility Guidelines (WCAG) 2.0 and 2.1. Understandable states that information and the operation of user interface must be understandable.

To read the W3C definitions for Understandable and its guidelines and success criteria, see Principle 3: Understandable — Information and the operation of user interface must be understandable.

Guideline 3.1 — Readable: Make text content readable and understandable

This guideline focuses on making text content as understandable as possible.

Also see the WCAG description for Guideline 3.1 Readable: Make text content readable and understandable.

Guideline 3.2 — Predictable: Make Web pages appear and operate in predictable ways

This guideline focuses on making user interfaces intuitive and understandable.

Also see the WCAG description for Guideline 3.2 Predictable: Make Web pages appear and operate in predictable ways.

Guideline 3.3 — Input Assistance: Help users avoid and correct mistakes

This guideline centers around helping users enter correct information when required with the minimum of mistakes.

Also see the WCAG description for Guideline 3.3 Input Assistance: Help users avoid and correct mistakes.

See also

• WCAG

  1. Perceivable

  2. Operable

  3. Understandable

  4. Robust