An XHTML file that is not well-formed because the em and strong elements overlap while they should nest. This makes the structure ambiguous and might cause problems, for example for IBM Home Page Reader (see 'HTML 4.01 validity errors' at http://www.w3.org/2005/Talks/0908-wcag/validity-errors.html. (As a consequence of this ambiguity, some user agents may render the order of the words in the sentence in an order that does not make sense.) Well-formedness error: overlapping elements Christophe.Strobbe@esat.kuleuven.be en Copyright BenToWeb 2005-2007 2005-10-04 accepted by both validators Documents must be well-formed Documents must be well-formed

This test case is intended to fail because the markup is ambiguous and may cause problems for assistive technologies.

 oneExpert

Please set your browser so that maximum information about the presentation of text is available.

Which words are presented in italic, which in bold?

 5 10 blindness low vision

Please set your screen reader so that maximum information about the presentation of text is available.

Which words are presented in italic and which in bold?

 5 10 blindness low vision

Please set your braille display/screen reader so that maximum information about the presentation of text is available.

Which words are presented in italic and which in bold?

 5 10 blindness deaf-blindness low vision

The syntax of the document is not correct; the content may be rendered in an incorrect order. IBM Home Page Reader 3.0 reads: If you have nothing then don't say it to say.

The document is not well-formed: the strong element is not completely nested inside the em element. See 'Common HTML 4.01 validity errors and their effect on accessibility' at http://www.w3.org/2005/Talks/0908-wcag/validity-errors.html and 'Tag Soup: How UAs handle <x> <y> </x> </y>' at http://ln.hixie.ch/?start=1037910467&count=1.

The syntax of the document is not correct; the content may be rendered in an incorrect order.

The document is not well-formed: the strong element is not completely nested inside the em element. See 'Common HTML 4.01 validity errors and their effect on accessibility' at http://www.w3.org/2005/Talks/0908-wcag/validity-errors.html and 'Tag Soup: How UAs handle <x> <y> </x> </y>' at http://ln.hixie.ch/?start=1037910467&count=1.