<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN"
    "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">

<svg width="250" height="50">
<title>Shrinking Rectangle</title>
<desc>Animating the width attribute of a rectangle</desc>

<rect x="10" y="10" width="200" height="20" stroke="black" fill="none">
  <animate id="animation"
    attributeName="width"
    attributeType="XML"
    from="200" to="20"
    begin="0s" dur="5s"
    fill="freeze" />
</rect>

</svg>