Techniques for WCAG 2.0

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FLASH36: Using scripts to control blinking and stop it in five seconds or less


This technique relates to:

User Agent and Assistive Technology Support Notes

See User Agent Support for Flash for general information on user agent support.


The objective of this technique is to control blinking with script so it can be set to stop in less than five seconds by the script. The ActionScript setTimeout() method is used to stop the MovieClip's blinking behavior in less than 5 seconds.


Example 1: Stopping blinking after a timeout

In this example a MovieClip (blinkingTextMC) uses its timeline to generate a blinking effect. Before 5 seconds has passed, the MovieClip's gotoAndStop() method is called, which stops the blinking effect.

Example Code:

setTimeout(stopBlinking, 4500);
function stopBlinking() {
  var blinkingTextMC = getChildByName('blinkingTextMC');

For a demonstration, view the working version of Stopping blinking after a timeout. The source of Stopping blinking after a timeout is available.



For each instance of blinking content:

  1. Start a timer for 5 seconds at the start of the blink effect.

  2. When the timer expires, determine if the blinking has stopped.

Expected Results

If this is a sufficient technique for a success criterion, failing this test procedure does not necessarily mean that the success criterion has not been satisfied in some other way, only that this technique has not been successfully implemented and can not be used to claim conformance.

Techniques are Informative

Techniques are informative—that means they are not required. The basis for determining conformance to WCAG 2.0 is the success criteria from the WCAG 2.0 standard—not the techniques. For important information about techniques, please see the Understanding Techniques for WCAG Success Criteria section of Understanding WCAG 2.0.