Tryit Editor v2.9

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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="110" width="110">
  <defs>
    <filter id="f1" x="0" y="0">
      <feGaussianBlur in="SourceGraphic" stdDeviation="15" />
    </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>
</html>