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WCAG Explorer (beta)

This resource is designed for anyone eager to master digital accessibility. Explore WCAG success criteria through clear, easy-to-understand descriptions. We owe a special "hat tip" to Johannes Lehner’s WCAG Card Deck, which served as the inspiration for this project.

We plan to expand this library over time, so please check back regularly for updates.

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  • 3.1 Readable

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  • Understandable

6 success criteria found for Understandable principle 3.1 Readable category

Success criterion 3.1.1 Language of Page

Level Level A, WCAG principle: Understandable

Assigned to the following themes: CODE AND LABELS WORDING

Each page must have a <html lang=""> attribute that matches the main language of the page.

Success criterion 3.1.2 Language of Parts

Level Level AA, WCAG principle: Understandable

Assigned to the following themes: CODE AND LABELS WORDING

Any parts of the content in a different language must be marked with the correct lang attribute.

Expressions borrowed from another language (like "déjà vu" in English) do not need this, unless pronunciation or understanding would be affected.

Success criterion 3.1.3 Unusual Words

Level Level AAA, WCAG principle: Understandable

Assigned to the following themes: WORDING

Unusual terms, jargon, or figurative language should be:

  • avoided when possible, or
  • explained the first time they appear

Success criterion 3.1.4 Abbreviations

Level Level AAA, WCAG principle: Understandable

Assigned to the following themes: WORDING

Abbreviations and acronyms should be:

  • avoided when possible, or
  • explained the first time they appear

Success criterion 3.1.5 Reading Level

Level Level AAA, WCAG principle: Understandable

Assigned to the following themes: WORDING

If content requires reading skills above lower secondary education (around 9th grade), provide:

  • a simpler version,
  • a summary,
  • a visual aid, or
  • a spoken version

to help with understanding.

Success criterion 3.1.6 Pronunciation

Level Level AAA, WCAG principle: Understandable

Assigned to the following themes: WORDING

If a word can be pronounced in different ways with different meanings, the intended meaning must be clarified to avoid confusion or ambiguity.