# VGAR Interaction Requirements

## No Blinking/Moving (INT-WEB-008)

### Never use blinking or flashing content

Content that blinks or flashes automatically should never be used because for users with photosensitive seizure disorders it can induce seizures.

### Requirements

#### No Blinking or Flashing (INT-WEB-008-01)

Content that blinks or flashes MUST never be used.

### Test Procedures

#### Visual Inspection (INT-WEB-008-01-T)

Confirm that each page contains no content that blinks or flashes.

### Related Content

#### WCAG Success Criteria

- [2.3.1 Three Flashes or Below Threshold](http://www.w3.org/TR/UNDERSTANDING-WCAG20/seizure-does-not-violate.html)
- [2.3.2 Three Flashes](http://www.w3.org/TR/UNDERSTANDING-WCAG20/seizure-three-times.html)

#### W3C Techniques

- [G11: Creating content that blinks for less than 5 seconds](http://www.w3.org/TR/2015/NOTE-WCAG20-TECHS-20150226/G11)
- [G187: Using a technology to include blinking content that can be turned off via the user agent](http://www.w3.org/TR/2015/NOTE-WCAG20-TECHS-20150226/G187)
- [G191: Providing a link, button, or other mechanism that reloads the page without any blinking content](http://www.w3.org/TR/2015/NOTE-WCAG20-TECHS-20150226/G191)

#### Common Failures

- [F47: Failure of Success Criterion 2.2.2 due to using the blink element](http://www.w3.org/TR/2015/NOTE-WCAG20-TECHS-20150226/F47)
- [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](http://www.w3.org/TR/2015/NOTE-WCAG20-TECHS-20150226/F4)
- [F50: Failure of Success Criterion 2.2.2 due to a script that causes a blink effect without a mechanism to stop the blinking at 5 seconds or less](http://www.w3.org/TR/2015/NOTE-WCAG20-TECHS-20150226/F50)