Principle 3 – Understandable

Information and the operation of user interface must be understandable.

Guideline 3.1 – Readable. Make text content readable and understandable.

  • 3.1.1 Language of Page – Level A
  • 3.1.2 Language of Parts – Level AA
  • 3.1.3 Unusual Words – Level AAA
  • 3.1.4 Abbreviations – Level AAA
  • 3.1.5 Reading Level – Level AAA
  • 3.1.6 Pronunciation – Level AAA

Additional Resources

Guideline 3.2 – Predictable. Make web pages appear and operate in predictable ways.

  • 3.2.1 On Focus – Level A
  • 3.2.2 On Input – Level A
  • 3.2.3 Consistent Navigation – Level AA
  • 3.2.4 Consistent Identification – Level AA
  • 3.2.5 Change on Request – Level AAA

Guideline 3.3 – Input Assistance. Help users avoid and correct mistakes.

  • 3.3.1 Error Identification – Level A
  • 3.3.2 Labels or Instructions – Level A
  • 3.3.3 Error Suggestion – Level AA
  • 3.3.4 Error Prevention (Legal, Financial, Data) – Level AA
  • 3.3.5 Help – Level AAA
  • 3.3.6 Error Prevention (All) – Level AAA