A few months ago, Google acknowledged that render your full page as a normal user would and this is something webmasters picked up on.
So if Google is seeing what the user sees, then what about content that is hidden within one of those "click to expand" links that show a snippet of content and then show you more when you click it?
Some users at WebmasterWorld are saying Google is no longer indexing and ranking such content.
A WebmasterWorld member said:
It seems google are no longer indexing any content in my “read more” panels that are hidden during the “onLoad” event.Shame because this is a user friendly way to display content and prevent unnecessary scrolling if the user isn’t interested in certain sections of a page.
It may be how this webmaster implemented it or it may be how Google wants to now index content. One webmaster likes the new approach saying if a user clicks through, they should see the content they searched for immediately without clicking a link to show more content.
But at the same time, keeping web pages clean and neat is something designers like to do.
I personally have not tested this but do let us know if you see the same behavior from Google.
Forum discussion at WebmasterWorld.
