Principle 3

Understandable

Users must be able to understand the content of apps. It is important to set the language to allow assistive technologies to speak the content in the correct language. Also make sure that the behavior of the app is predictable, allowing users to understand what is expected. Furthermore, clearly identify errors so users can correct them.

Examples

• It's challenging to learn an app when the navigation on each screen is different.

• The language of the app must be set so that the screen reader to read the content in the correct language.

• When mistakes are made, it is important to clearly indicate them and to offer assistance.

Guidelines

• 

  Readable

  Content must be readable, including for those using assistive technologies.

  Guideline 3.1 - Readable
• 

  Predictable

  It must be predictable what happens after executing an action.

  Guideline 3.2 - Predictable
• 

  Input Assistance

  Include assistance when requesting input to allow everyone to input correct information.

  Guideline 3.3 - Input Assistance

Resources

• WCAG 2.2 - Principle 3 - Understandable