Alessio Atzeni, a web designer and front-end developer from Rome, Italy rendered Mac OS X Lion using HTML5 and CSS3. This is the first stage of his project. He added Boot Logo, Login and desktop. He also said in his blog that he will add more features like icons and other stuffs. You can check his entire project detail on his blog.
Do Check : Awesome iPhone 4 Written In CSS3
You can check this Awesome Mac OS X Lion by visiting this link
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