Masking elements using CSS3 filters

Is it feasible to apply CSS3 filters as a mask? For example, I would like to blur only 30% of a div from the top. How can this be accomplished?

I have created a small jsfiddle to demonstrate what I am attempting to achieve: http://jsfiddle.net/uxCXa/2/

Answer â„–1

To achieve this effect, I would utilize a pseudo-element along with the addition of a box-shadow to mimic WebKit's blur filter.

.container {
  position: relative;
  width: 200px;
}

.container:after {
  position: absolute;
  top: 15%;
  bottom: 15%;
  left: 0;
  right: 0;
  background: rgba(100,100,100,0.3);
  box-shadow: 0 0 3px 0 rgba(100,100,100,0.3);
  z-index: 2;
  content: "";
}

Adjust the values for top and bottom to be half of the desired 30% height.

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