Matan · WCAG · Perceivable

Images: alternative text

WCAG 1.1.1 requires a text alternative for non-text content.

Pass condition in our engine: Informative images have non-empty alt (or the page has no images).

1. Problem description

Screen-reader users hear “image” with no description if alt is missing. Search and AI systems also lose the only textual description of the photo. Decorative images should use empty alt, not a missing attribute.

2. Most common causes

  • CMS uploads without an alt field.
  • Icons implemented as <img> with no alt.
  • Client-rendered galleries not in the HTML we fetch.

3. How to fix it

  1. Describe the meaning of informative images in alt.
  2. Use alt="" for decorative images.
  3. Do not stuff keywords into alt.

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