Techniques for WCAG 2.0

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F4: Failure of Success Criterion 2.2.2 due to using text-decoration:blink without a mechanism to stop it in less than five seconds

Important Information about Techniques

See Understanding Techniques for WCAG Success Criteria for important information about the usage of these informative techniques and how they relate to the normative WCAG 2.0 success criteria. The Applicability section explains the scope of the technique, and the presence of techniques for a specific technology does not imply that the technology can be used in all situations to create content that meets WCAG 2.0.


Cascading Style Sheets.

This failure relates to:

User Agent and Assistive Technology Support Notes

See User Agent Support Notes for F4.


CSS defines the blink value for the text-decoration property. When used, it causes any text in elements with this property to blink at a predetermined rate. This cannot be interrupted by the user, nor can it be disabled as a user agent preference. The blinking continues as long as the page is displayed. Therefore, content that uses text-decoration:blink fails the Success Criterion because blinking can continue for more than three seconds.


Failure Example 1

A product list page uses the text-decoration:blink style on an element to draw attention to sale prices. This fails the Success Criterion because users cannot control the blink.

Example Code:

<p>My Great Product <span style="text-decoration:blink">Sale! $44,995!</span></p>


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  1. Examine inline styles, internal stylesheets, and external stylesheets for the text-decoration property with a value of "blink".

  2. If the property is used, determine if the ID, class, or element identified by selectors on which this property is defined are used in the document.

Expected Results