HTML/Usage/TextAlternatives

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The HTML5 specification requires conformance checkers to report the lack of an alt attribute as an error, except in certain cases; for details, see the Guidance for conformance checkers subsection of the Requirements for providing text to act as an alternative for images section of the spec.

Authoring useful alt attribute content requires the author to carefully consider the context in which the image appears and the function that image may have in that context. For guidance on writing text alternatives refer to the Requirements for providing text to act as an alternative for images section of the spec.