Test Case sc1.1.1_l1_015: Alternative text for two nested objects with image map inside innermost object

Formal Metadata

Formal Metadata
TitleAlternative text for two nested objects with image map inside innermost object
DescriptionA document with an object element in an image map. The object element embeds an image in PNG format, and contains another object element that embeds the GIF version of the same image. This second object element contains only the image map. The object elements do not have a title attribute or any other text alternative except the alt attributes of the map's area elements.
CreatorBenToWeb (Christophe.Strobbe@…)
RightsCopyright BenToWeb 2005-2007
LanguageEnglish
Date2005-08-26
Statusaccepted QA

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

It is not entirely clear if this test case fails. The innermost object element does not contain an img element with an alt attribute, but it contains the image map, and each area in the image map has an alt attribute that conveys the same information as the area, and the image itself is identified in the text above it. In addition, browser support for the object element may determine if this test case is accessible or not. Internet Explorer (version 6 or earlier) has weak or no support for the object element.

Test Modes

Accessibility expert.

Test Files

Test file.

TCDL Data

sc1.1.1_l1_015 (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 10, column 6: http://www.w3.org/TR/2006/WD-WCAG20-20060427/guidelines.html#text-equiv-all.

The test case fails the following success criterion at line 12, column 134: http://www.w3.org/TR/2006/WD-WCAG20-20060427/guidelines.html#text-equiv-all.

Functional Outcome

The image has a text description in the sentence preceding it. User testing with screen reader users provided the following results: most users of speech output could understand the image, but most users (5 out of 6) of a Braille display could not. (All were users of Internet Explorer 6 or 7.)

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.

This test case is identical to sc1.1.1_l1_014, except that the fallback image has been removed from the innermost object element.

(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 6.0 does not support object so the test does not work in this browser - tested on both Windows 2000 and Windows XP Professional.)

Secondary Rules

Secondary Rule (WCAG 2.0 - June 2005 Working Draft)

The test case needs review before it can be established if it passes or fails the following success criterion: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#text-equiv-informative. The code that causes doubt can be found at line 10, column 6.

The test case needs review before it can be established if it passes or fails the following success criterion: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#text-equiv-informative. The code that causes doubt can be found at line 12, column 134.

Functional Outcome

The image has a text description in the sentence preceding it.

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.

This test case is identical to xhtml1_wcag2_20050630_1.1_l1_sc1_014, except that the fallback image has been removed from the innermost object element.

(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 so the test does not work in this browser.)