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Alt text

The written description of an image that a screen reader reads aloud and a search engine indexes.

Also called
alternative text, image description

Alt text is the short text alternative attached to an image in the code. A screen reader reads it in place of the image, it appears when the image fails to load, and Google says it uses alt text, along with computer vision and the page’s content, to understand what an image shows.

Good alt text says what the image means in its context, in a sentence: “Brown leather hiking boots, shown from the side.” A decorative image gets empty alt text so screen readers skip it. Missing alt text was the second most common failure in the WebAIM Million 2026, found on 53.1% of the top million home pages.

Source

Easy Checks – A First Review of Web Accessibility

W3C Web Accessibility Initiative (WAI), 2024. Checked .

Screen reader
Software that reads what is on the screen aloud or sends it to a braille display.
Accessible name
The name a control is announced by, taken from its label, its text, or its alt text.
Audio description
A narration track that describes what is happening on screen for people who cannot see the video.

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