Whether some code hidden elements for SEO?

Good day.
There is a slider, which because of the possibility of automatic scaling of the slides are ordinary div's with the background image. Whether it is necessary to push there a hidden (retracted under the slide using z-index) prescription img alt attribute, so images of the slides are displayed in, for example, the image search? Or it can hit?

Thank you.
July 8th 19 at 16:43
1 answer
July 8th 19 at 16:45
Google is not a fool - long ago, these chips firing.

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