Tryit Editor v1.8

Source Code:

<!DOCTYPE html>
<html>
<body>

<p><b>Note: </b>Internet Explorer and Safari do not support SVG filters yet!</p>

<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
  <defs>
    <filter id="filter" x="0" y="0">
      <feGaussianBlur stdDeviation="5" />
      <feOffset dx="5" dy="5" />
    </filter>
  </defs>
  <rect width="90" height="90" fill="grey" filter="url(#filter)" />
  <rect width="90" height="90" fill="yellow" stroke="black" />
</svg>

</body>
</html>

Result:

W3Schools.com - Try it yourself

Edit the code above and click "Submit Code" to see the result.