Methodology
Image alt text
ia.image-alt · 3.5
Read
MUST
Recommendation
Why it matters
Some browser agents can inspect screenshots, but image understanding varies by access mode. Descriptive alt text provides a durable machine-readable description of image content and context.
How to fix it
Give each content image a descriptive alt text and decorative images an empty alt.
-
Add an alt attribute that describes the content of each informative image.
<img src="chart.png" alt="Revenue grew 20% in 2026"> -
Use alt="" for decorative images.
Verify
Run a new scan for this checkpoint:
isagentready results {domain} --checkpoint ia.image-alt
Details Mapping, lifecycle and references
- AR mapping
- No AR practice
- Evidence source
- WCAG Non-text Content
- Score role
- Core
- Introduced
- 2026-08-24
- Methodology version
- 2026-10-22