Test Case xhtml1_wcag2_20050630_1.1_l1_sc1_018: Alternative text for areas in client-side image maps: object and nested image both referencing same map; empty alt attributes in image map areas

Formal Metadata

Formal Metadata
TitleAlternative text for areas in client-side image maps: object and nested image both referencing same map; empty alt attributes in image map areas
DescriptionA document with an object element in an image map. The object element embeds an image in PNG format, and contains an img element with the GIF version of the same image. The alt attribute of the img element identifies the image and conveys the same information. However, the alt attributes of the map's area elements are all empty. The object element does not have a title attribute or any other text alternative except the alt attribute of the img element.
CreatorBenToWeb (Christophe.Strobbe@…)
RightsCopyright BenToWeb 2004-2007
LanguageEnglish
Date2005-08-29
Statusdraft

Technologies and Features

Technologies are markup languages or data formats. If the technology is a markup language, “features” refers to elements and attributes.

XHTML™ 1.0 The Extensible HyperText Markup Language (Second Edition)

XHTML™ 1.0 The Extensible HyperText Markup Language (Second Edition)

Feature: img (namespace: http://www.w3.org/1999/xhtml) .

Technical specification: How to specify alternate text .

Feature: object (namespace: http://www.w3.org/1999/xhtml) .

Technical specification: General Inclusion: The object element .

Feature: map (namespace: http://www.w3.org/1999/xhtml) .

Technical specification: How to create client-side image maps .

Feature: area (namespace: http://www.w3.org/1999/xhtml) .

Technical specification: Client-side image maps: the map and area elements .

Test Data

Purpose

This test case is intended to fail because none of the areas of the image map has a text alternative. The empty text alternatives are an issue in their own right, but, in addition to this, browser support for the object element may also determine if this test case is accessible or not. Internet Explorer has weak or no support for the object element.

Test Modes

End user.

Test Files

Test file.

TCDL Data

xhtml1_wcag2_20050630_1.1_l1_sc1_018 (XML).

Rules

“Rules” refer to success criteria in WCAG 2.0, checkpoints in WCAG 1.0 and similar requirements.

Primary Rules

The test case fails the following success criterion at line 15, column 7: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#text-equiv-informative.

The test case fails the following success criterion at line 18, column 46: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#text-equiv-informative.

The test case fails the following success criterion at line 19, column 47: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#text-equiv-informative.

The test case fails the following success criterion at line 20, column 47: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#text-equiv-informative.

Functional Outcome

The image has a fallback with a text description but none of the areas in the image map has a text description.

Technical Comment

The object element has an img element with an alt attribute as a fallback . Since there is no direct text alternative, it is not entirely clear if this code is accessible. However, since each of the area elements in the map element has an alt attribute, this case does not pass.

This test case is identical to xhtml1_wcag2_20050630_1.1_l1_sc1_011, except that the alt attribute in each area is empty.

(In Mozilla 1.7.3 and Firefox 1.0, the map does not work if the map element has only an id and no name attribute.)

(Internet Explorer does not support object but displays the fallback image.)