Decision aids

Choose an image alternative by its role

A text alternative depends on what the image contributes. Appearance alone is insufficient when it acts as a button or conveys data.

  1. Define the role
  2. Write the equivalent
  3. Read without the image
Choose an image alternative by its role
SituationWhat changesUseful check
Informative imageConvey the essential information in context.Do not unnecessarily repeat a nearby caption.
Functional imageName the action or destination.A button should announce its purpose, not just its icon’s shape.
Complex chartProvide a complete equivalent of useful data or relationships.Supply a description and, where appropriate, a readable table.

An empty alt attribute avoids announcing a purely decorative image. Read the page without images: essential actions and information should remain identifiable.

Documentation : W3C WAI — Images Tutorial ↗ · · Read the reference record →

Describe accessibility with appropriate caution

A useful statement explains measures actually present, known limitations, the assessment approach and a simple way to request help. It does not turn self-evaluation into certification.

Editorial review

Publication director: Vincent Ferrer. Webmaster / Domain name owner: Alexis RZG.

State what works and listen when something blocks access

Accessibility improves when technical decisions remain assessable and visitors have a human contact for describing a specific barrier. World Web Certified would rather document and correct a limitation than publish an absolute claim it cannot guarantee.

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