H45: Using longdesc

The objective of this technique is to provide information in a file designated by the longdesc attribute when a short text alternative does not adequately convey the function or information provided in the image. The longdesc attribute is a URI, the target of which contains a long description of the non-text content.

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• Too much accessibility - the rise and fall of the LONGDESC

• G73: Providing a long description in another location with a link to it that is immediately adjacent to the non-text content
• G74: Providing a long description in text near the non-text content, with a reference to the location of the long description in the short description
• G92: Providing long description for non-text content that serves the same purpose and presents the same information
• G94: Providing short text alternative for non-text content that serves the same purpose and presents the same information as the non-text content

Procedure

1. Check that the img element has a longdesc attribute.

2. Check that the value of the longdesc attribute is a valid URI of an existing resource.

3. Check that the content at the target of that URI contains a long description describing the original non-text content associated with it.

Expected Results

• #1 through #3 are all true