An XHTML file that is not well-formed because there is an img element that has two alt attributes instead of one. Both alt attributes contain a different text alternative. It is not clear if the first or the last attribute will take precedence in user agents and assistive technologies. Well-formedness error: duplicate attributes Christophe.Strobbe@esat.kuleuven.be en Copyright BenToWeb 2004-2007 2005-10-05 accepted for end user evaluation Strictly Conforming Documents

This test case is intended to fail because there is an element with duplicate attributes. This makes the document ambiguous for screen readers.

 enduser

What does the image represent?

 -1 1 -2 blindness

What does the image represent?

 -1 1 -2 blindness

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

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