How does Google treat hidden content which becomes visible when clicking a button?

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Published on July 24, 2013 4:31:02 PM ● Video Link: https://www.youtube.com/watch?v=EsW8E4dOtRY

Duration: 1:43

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How does Google treat hidden content which becomes visible when clicking a button? Does it look spammy if most of the text is in such a section? (e.g. simple page to buy something and "show details" button which reveals a lot of information about it.)
Thomas Greiner, Cologne

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