CSS version here - http://heldfree.com/play/clear_mac/
Gave a shot at doing a rebound in pure CSS3. The whole icon is composed of divs. Tools of trade - box shadows, 3d transforms, and perspective.
The tick is composed of two divs, so upper edges couldn't be perfected to match the original. The overlap can expose shadows and borders in the joint area. Also, the lower shadows couldn't be perfected due to this disjoint.
I had hopes to find a font that would suffice for tick, but at that size, getting the right rounded corner is hard. Last easier resort to perfect the tick mark would be SVG.
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