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Now that the mobile-first indexing process is really rolling out now I wanted to remind you that Google said hidden content is okay when you switch over the the mobile-first indexing process, as long as it is accessible in the mobile site. So content in tabs or accordions or other methods to clean up the design but let users access that content, is fine according to Google.
Two different Googlers restated this the other day. John Mueller of Google said this again at BrightonSEO on stage:
Aaseesh from Google said this the other day in the Google Webmaster Help forums:
Forum discussion at Twitter and Google Webmaster Help.