Test Case xhtml1_wcag2_20050630_2.2_l2_sc1_003: Blinking with CSS to highlight important information

Formal Metadata

Formal Metadata
TitleBlinking with CSS to highlight important information
DescriptionA document with "normal" content and a paragraph with blinking content. The blinking effect is created with the CSS rule text-decoration: blink. This property is not supported by all browsers (for example Internet Explorer 6) and cannot be turned off in some other browsers (including Mozilla 1.7.3 and Firefox 1.0).
CreatorBenToWeb (Christophe.Strobbe@…)
RightsCopyright BenToWeb 2004-2007
LanguageEnglish
Date2005-09-29
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)

Cascading Style Sheets, level 2

Cascading Style Sheets, level 2

Feature: text-decoration.

Technical specification: text-decoration .

Test Data

Purpose

This test case is intended to fail because the blinking does not stop after three seconds and there is no mechanism in the content to turn it off. Only the blinking paragraph is tested here, not the other parts of the page.

Test Modes

End user.

Test Files

Test file.

TCDL Data

xhtml1_wcag2_20050630_2.2_l2_sc1_003 (XML).

Rules

“Rules” refer to success criteria in WCAG 2.0, checkpoints in WCAG 1.0 and similar requirements.

Primary Rules

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/#time-limits-blink. The code that causes doubt can be found at line 8, column 29.

Functional Outcome

The instructions in the last paragraph blink for more than three seconds, unless the user turns off the blinking in their browser.

Technical Comment

Conforming user agents are not required to support the value "blink" for the property text-decoration (http://www.w3.org/TR/1998/REC-CSS2-19980512/text.html#propdef-text-decoration).

Internet Explorer does not seem to support the value "blink" for the property text-decoration, because it does not cause any blinking. In Opera 8.02, the blinking can be turned off by switching to "user mode". In Mozilla 1.7.3 and Firefox 1.0, the "Preferences" or "Options" dialogue does not contain a mechanism to turn off blinking.