Facebook Icon in CSS Using a Single Div

I was inspired by the idea that you can make a wide range of shapes using only CSS on a single div after reading this css-trics.com page. I created the Facebook Icon using a single div:

<div id="f"></div>

#f {
    width: 100px;
    height: 80px;
    background-color: #3B5998;
    border-bottom: 20px solid #6d84b4;
    position: relative;
}
#f:before {
    position: absolute;
    top: 15px;
    right: 15px;
    border: 15px solid #fff;
    border-bottom: none;
    border-right: none;
    border-top-left-radius: 15px;
    width: 15px;
    height: 65px;
    content: "";
}
#f:after {
    position: absolute;
    top: 44px;
    left: 43px;
    height: 15px;
    width: 42px;
    background-color: #fff;
    content: "";
}

It works in Firefox 5, Chrome 13, and Safari 5.1. It works in IE8, but the "f" is not rounded. See the JS Fiddle version.

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Facebook Icon in CSS Using a Single Div

Neat!