Update video-captions-f51b46.md

[tbostic32]

First cut at updates to the video element auditory content has captions rule. Includes:

• Update to applicability to remove silence
• Update to test case descriptions
• Replace "baked in" with "open captions"

TODO: There are concerns the rule is too strict and requiring captions for things that do not need them. Per the definition of captions, "only information needed to understand the media content". This opens the door for content in the video that is purely peripheral, as well as content that is self explained in the video (e.g., a stop sign).

Need for Call for Review:
This will require a 1 week Call for Review

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[carlosapaduarte]

TODO: There are concerns the rule is too strict and requiring captions for things that do not need them. Per the definition of captions, "only information needed to understand the media content". This opens the door for content in the video that is purely peripheral, as well as content that is self explained in the video (e.g., a stop sign).

I'm not sure I understand this concern. The expectation requires captions for "audio information that is not conveyed visually in the video". A stop sign is not "audio information". A clip showing a stop sign while a narrator speaks "stop sign" would pass even without caption because the information is conveyed visually in the video.

And deciding what audio content is peripheral or not will always be controversial, I guess.

[giacomo-petri]

I cannot propose a change for this specific snippet of code but, in "Failed Example 4" there is a typo issue; we should replace ariadescribedby="text" with aria-describedby="text"