Test Case xhtml1_wcag2_20050630_4.1_l3_sc1_007: Well-formedness error: duplicate attributes, first one empty

Formal Metadata

Formal Metadata
TitleWell-formedness error: duplicate attributes, first one empty
DescriptionAn XHTML file that is not well-formed because there is an img element that has two alt attributes instead of one. The first alt attribute is empty; the second contains text alternative. It is not clear if the first or the last attribute will take precedence in user agents and assistive technologies. If the first takes precedence, the screen reader will ignore the image; if the second takes precedence, the screen reader may read the text alternative.
CreatorBenToWeb (Christophe.Strobbe@…)
RightsCopyright BenToWeb 2004-2007
LanguageEnglish
Date2005-10-05
Statusaccepted for end user evaluation

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: Strictly Conforming Documents .

Test Data

Purpose

This test case is intended to fail because there is an element with duplicate attributes. This makes the document ambiguous for screen readers. Which alt attribute will a user agent or a screenreader pick up?

Test Modes

End user.

Test Files

Test file.

TCDL Data

xhtml1_wcag2_20050630_4.1_l3_sc1_007 (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 11, column 87: http://www.w3.org/WAI/GL/WCAG20/WD-WCAG20-20050211/#4.1_use-spec-avoid-spec-no-exception.

The test case fails the following success criterion at line 11, column 94: http://www.w3.org/WAI/GL/WCAG20/WD-WCAG20-20050211/#4.1_use-spec-avoid-spec-no-exception.

Functional Outcome

The document is not well-formed: the image has two alt attributes; the use may not get the correct alternative text.

Technical Comment

XML 1.0, Third Edition: An attribute name MUST NOT appear more than once in the same start-tag or empty-element tag.