What are the steps to create a CSS3 blur effect within a parent container?

Is it possible to create an inner-blur effect using css3 without ignoring the parent container dimensions and causing overflow? Any tips or tricks on achieving this?

html

<div class="box">
      <div class="blur">
           <img src="..." />
      </div>
</div>​

css

.box{
    width: 300px;
    height: 300px;
    border: 1px solid red;
}

.blur{
    -webkit-filter: blur(20px);
}

An example demonstrating overflow with blur:

http://jsfiddle.net/ngJEr/

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