| Title | Well-formedness error: overlapping elements |
|---|---|
| Description | 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.)
|
| Creator | BenToWeb (Christophe.Strobbe@…) |
| Rights | Copyright BenToWeb 2005-2007 |
| Language | English |
| Date | 2005-10-04 |
| Status | accepted by both validators |
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)
Feature: em
(namespace: http://www.w3.org/1999/xhtml)
.
Technical specification: Documents must be well-formed .
Feature: strong
(namespace: http://www.w3.org/1999/xhtml)
.
Technical specification: Documents must be well-formed .
This test case is intended to fail because the markup is ambiguous and may cause problems for assistive technologies.
Accessibility expert.
“Rules” refer to success criteria in WCAG 2.0, checkpoints in WCAG 1.0 and similar requirements.
The test case fails the following success criterion at line 9, column 15: http://www.w3.org/TR/2006/WD-WCAG20-20060427/guidelines.html#ensure-compat-parses.
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 test case fails the following success criterion at line 9, column 15: http://www.w3.org/WAI/GL/WCAG20/WD-WCAG20-20050211/#4.1_use-spec-avoid-spec-no-exception.
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.