Sc2 4 4 Image Map

Please note, this is a draft

Description

This test checks if each area element contains an alt attribute that is not empty. If two or more alt values in the collection of area elements are equal, the corresponding href value should also be equal.

Background

• H24: Providing text alternatives for the area elements of image maps
• G91: Providing link text that describes the purpose of a link
• H30: Providing link text that describes the purpose of a link for anchor elements

Assumptions

• area elements that are not enclosed by a <map> element will not serve any purpose and are therefore excluded from the test

List of all assumptions.

Test properties

Test procedure

Selector

Test mode: automatic

Select elements using the following selector: map[name] area, if the name attribute of the map element is referred to by a usemap attribute of an img element in the same document.

Step 1: Check for non-empty alt attributes (H24)

Test mode: automatic

Check if the area element has an alt attribute that contains non-empty text.

if yes, continue with [Step 2][STEP2]

else return

Step 2: Check for uniqueness of the alt attribute value

Test mode: automatic

For each set of area elements enclosed by a map element:

• Make an array of the alt attribute values in the area elements;
• Check for duplicate values.

if duplicate values exist, continue with Step 3

else continue with Step 4

Step 3: Check duplicate alt attribute values for identical hrefs

Test mode: automatic

For each duplicate alt attribute value in the same set of area elements, make an array of the href attribute values in the area elements;

if the href attribute values are identical, continue with Step 4

else return

Step 4: Does the text of the link describe its purpose? (H24, G91)

Test mode: manual

User Input Question:

if yes, return

else return