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  <title>CSS Test: blur computation for box-shadow</title>
  <link rel="author" title="L. David Baron" href="https://dbaron.org/" />
  <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
  <link rel="help" href="http://www.w3.org/TR/css3-background/#the-box-shadow"/>
  <meta name="assert" content="the resulting shadow must approximate 