Hi, I'm Steve. I'm a UX Designer

This CodePen demonstrates how we can animate the opening and closing states of an accordion with fancy reveal animation using only CSS. This concept is suitable for creating FAQ sections, Table of Contents, and more.

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I would highly recommend watching his video, where he beautifully explains the technique and points out how he discovered it. Also, read Keith J. Grant's post and Nelson Menezes's post on the same topic.