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This technique relates to:
The objective of this technique is to allow users to identify the non-text content even if the non-text content is intended to provide a specific sensory experience. For example, a deaf person may want to know what an audio instrumental file is - even if they cannot hear it. Similarly, a blind person may want to know what the subject of a visual image is - even if they cannot see it.
Example 1: A painting of the Mona Lisa has an alternate text of "Mona Lisa, by Leonardo da Vinci"
Example 2: A sound file has an alternate text of "5 Grade schoolers playing a Theramin".
Example 3: A famous modern art piece is labeled "Red, Blue and Yellow, by Piet Mondrian"
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Check that alternate text provides a descriptive name
Check that alternate text provides a name that has be previously been given to the non-text content by the author or another.
#1 or #2 is true