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ARIA: table role

aria-describedby is mapped within accessibility APIs as hint text, not labels. The caption element is mapped as a table's label. The distinction is very important. An accessible description provides additional information, related to an interface element, that complements the accessible name. The functional importance is that an object's label is always read by TTS software whereas the description might not be

<audio>: The Embed Audio element

Using the prior sample as-is results in validation error. Providing the notification after the `source` element will not throw the validation error