4.3 Explanations of pictures and actions that can be switched off/on

Including auditory descriptions of pictures or actions is a useful function as an alternative choice. This is also the case for explanations using signs or speech for video. This function will provide special support for those with sight and hearing impairments, but may also be of more general use for interpreting graphic information.

It should be possible to switch on/off  the explanations of pictures/actions. In some cases the explanations may be a redundancy that technical aids use automatically (e.g. products with a web interface).  

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