Tryit Editor v2.6

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<!DOCTYPE html>
<html>
<body>

<p><strong>Note:</strong> Internet Explorer 9 and earlier versions do not support SVG filters.</p>

<svg height="140" width="140">
  <defs>
    <filter id="f1" x="0" y="0" width="200%" height="200%">
      <feOffset result="offOut" in="SourceAlpha" dx="20" dy="20" />
      <feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
      <feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
    </filter>
  </defs>
  <rect width="90" height="90" stroke="green" stroke-width="3" fill="yellow" filter="url(#f1)" />
  Sorry, your browser does not support inline SVG.
</svg>

</body>

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</html>