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Provide extended audio descriptions when natural pauses aren't long enough.
Why it matters: Ensures blind users get all necessary visual information even in fast-paced videos.
Where pauses in foreground audio are insufficient to allow audio descriptions to convey the sense of the video, extended audio description is provided for all prerecorded video content in synchronized media.
What This Means: This success criterion requires extended audio descriptions for videos where standard audio descriptions cannot fit into natural pauses in the audio. Extended audio descriptions pause the video playback to insert longer, more detailed descriptions of complex visual scenes, then resume playback. This ensures that blind users receive all important visual information even in fast-paced or visually complex content.
Why It's Important: Some videos have very little dialogue or fast-paced action where natural pauses are too short for adequate audio descriptions. Standard audio descriptions might miss important visual details because they must fit into brief pauses. Extended audio descriptions solve this by pausing the video, providing detailed descriptions, then resuming, ensuring nothing is missed.
Extended audio descriptions work by temporarily pausing the video at appropriate points to insert longer descriptions. The video then resumes after the description is complete. This technique is particularly important for educational content, complex narratives, or videos with rapid visual changes where standard descriptions would be insufficient.
This criterion ensures that blind users can access and understand the content, improving their overall experience and ability to use the website effectively.
This criterion ensures that users with low vision can access and understand the content, improving their overall experience and ability to use the website effectively.
Impact: When this criterion is properly implemented, it removes barriers for these user groups and creates a more inclusive web experience for everyone.
A fast-paced video has standard audio description that misses important visual details.
<video>
<track kind="descriptions" src="standard-descriptions.vtt">
</video>A video includes extended audio description that pauses the video to describe important visual elements.
<video>
<track kind="descriptions" src="extended-descriptions.vtt">
<!-- Extended description pauses video to describe complex scenes -->
</video>This success criterion benefits the following user groups:
Tip: Use this checklist during development and testing to ensure all requirements for 1.2.7 Extended Audio Description (Prerecorded) are met. Check off items as you complete them.
Note: These are official W3C resources for 1.2.7. For the most up-to-date information and detailed technical guidance, always refer to the official W3C documentation.
Implementing 1.2.7 Extended Audio Description (Prerecorded) correctly requires understanding your specific context. Code solutions vary significantly based on multiple factors:
HTML, React, Vue, Angular, PHP, Python, and other frameworks each have different patterns and best practices.
Server-side rendering, client-side rendering, static generation, and hybrid approaches require different solutions.
Your existing components, styling approach, and UI library influence how accessibility must be implemented.
Your specific user base, content type, and interaction patterns determine the most appropriate implementation.
We provide tailored implementation guidance by analyzing your specific technology stack, coding patterns, design system, and project requirements. Our team reviews your codebase and provides custom solutions that integrate seamlessly with your existing architecture.
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Perceivable PrincipleGuideline
1.2 Time-based Media