WCAG Level AA guidelines include criteria for automatic audio and moving content that enhance accessibility. Audio that plays longer than 3 seconds must allow users to pause or control volume without affecting system sounds. Users with assistive technologies, like screen readers, require this control to avoid overlap. Automatically moving content lasting longer than 5 seconds must also have a pause feature to minimize distractions, particularly aiding users with ADHD or dyslexia. The best practices focus on avoiding autoplay features and ensuring the necessity of moving content is critically evaluated.
Guideline: Any audio that automatically plays for more than 3 seconds must include a mechanism to pause (stop) the audio or control the audio's volume without impacting the system's volume. Best practice: Don't autoplay audio. If the user didn't initiate the sound, they probably don't want to hear it.
Guideline: Any content that automatically moves, blinks, or scrolls and lasts longer than 5 seconds must include a mechanism to pause (stop) it unless the content is essential to the webpage. Best practice: Challenge the necessity of any content that automatically moves or blinks on a webpage.
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