Soft show content reveal

Hi - not sure what this would be called exactly. Is there a plugin that allows for the soft show content reveal like Envato has for the mobile site. The first few sentences are visible and that fades to a read more or show more button - the rest of the content is revealed if tapped/clicked. Has smooth reveal, not just a tab or accordion style. Better than that. I think some other sites use this as well. Can’t think of them off hand. News sites in some cases I believe. I haven’t really found anything that does this well. Fades to the read more and smooth reveal. Just wondering if anyone knows of something?