2.3.1: Three Flashes or Below Threshold [A]
Since any content that does not meet this success criterion can interfere with a user's ability to use the whole page, all content on the Web page (whether it is used to meet other success criteria or not) must meet this success criterion. See Conformance Requirement 5: Non-Interference.
Sufficient Techniques for Success Criterion 2.3.1
Note: Other techniques may also be sufficient if they meet the success criterion. See Understanding Techniques.