See Understanding Techniques. G60: Playing a sound that turns off automatically within three seconds G170: Providing a control near the beginning of the Web page that turns off sounds that play automatically G171: Playing sounds only on user request Failures for Success Criterion 1.4.2 F23: Failure of 1.4.2 due to playing a sound longer than 3 seconds where there is no mechanism to turn it off F93: Failure of Success Criterion 1.4.2 for absence of a way to pause or stop an HTML5 media element that autoplays Back to top 1.4.3 Contrast (Minimum) Level AA The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following: Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1; Incidental: Text or images of text that
 are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement. Logotypes: Text that is part of a logo or brand name has no contrast requirement. Understanding 1.4.3 Show Hide techniques and failures for 1.4.3 Sufficient Advisory Failures Sufficient Techniques for Success Criterion 1.4.3 Note: Other techniques may also be sufficient if they meet the success criterion. See Understanding Techniques.