Translations:Wikimedia Apps/iOS Suggested edits/35/en

What is alt text used for?
In situations where the image is not available to the reader, perhaps because they have turned off images in their web browser or are using a screen reader due to a visual impairment, the alternative text ensures that no information or functionality is lost. Absent or unhelpful alternative text can be a source of frustration for visually impaired users. On Wikipedia, alternative text is typically supplied through a combination of the image caption and the text supplied for the image  parameter in the MediaWiki markup.