Una Kravets makes pixel art using style sheets:
What exactly is making those little pixels? If the title didn’t give it away, it’s the CSS3 multiple box shadow property. Each pixel is it’s own, individually placed box shadow. These are strung together via a comma-separated list. You can have as many box-shadows as you want on a div.
[Source: Sass Pixel Art]
Via BoingBoing.
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