SC1-1-1-aria-describedby

This test case belongs to 1.1.1 Non-text Content

Status

Description

This test checks the sufficient provision of a long text description for elements using the aria-describedby attribute.

Background

• ARIA15: Using aria-describedby to provide descriptions of images
• 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
• F67: Failure of Success Criterion 1.1.1 and 1.2.1 due to providing long descriptions for non-text content that does not serve the same purpose or does not present the same information
• The proper provision of a short text alternative is checked in SC1-1-1-text-alternative.

Assumptions

• It is not checked for references to long text descriptions within short text alternatives such as "The image is described in text below".
• If the aria-describedby attribute is provided, a long description was intended and is needed for the element.
• This test assumes that role="image" is properly used.

Test properties

Test procedure

Selector

Select following elements providing an aria-describedby attribute:

• img elements
• input elements of type="image"
• all elements with role="image"

//*[self::img[@aria-describedby] or self::input[@type="image" and @aria-describedby] or self::*[@role="image" and @aria-describedby]]

Step 1

Check if at least one of the aria-describedby attribute values is a valid identifier.

if yes continue with #Step 2

else return

Step 2

Check if at least one of the elements referenced by the valid aria-describedby attribute values exists.

if yes, continue with #Step 3

else return

Step 3

Concatenate the results of Text Alternative Computation Algorithm run on the element itself and assign it to variable T1 and on all elements referenced by the aria-describedby attribute and assign it to variable T2.

if yes, return

else return