Want to explore the practical side of it a little bit more? To show how to leverage the CSS clip property to make a smooth transition when clicking on a box element. Free Expanding Overlay CSS Effect show some kind of overlay as if it’s actually underneath the respective element. Clicking an element will create a cut-out effect, revealing another layer that will expand. View Demo and Download it now!!
http://tympanus.net/codrops/2013/01/17/putting-css-clip-to-work-expanding-overlay-effect
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