Glossary · Indexing and discovery

alt attribute

The text alternative on an image. Present and empty marks the image as decorative and is correct; present and descriptive is read aloud; absent entirely makes a screen reader announce the file name. The defect is absence, and a check that fails on empty alt reports every decorative icon as a fault.

Indexing and discovery

Whether a page can be found and kept, separately from whether it can be fetched.

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