<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20001102//EN" 
  "http://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd">
<svg   id="animation-extRef-image3"  width="360" height="120" viewBox="0 0 360 120">
<g style="stroke: black; stroke-width:2">  
    <rect x="2" y="10" width="120" height="20" style="fill: lightgreen"/>
    <rect x="2" y="50" width="240" height="20" style="fill: blue"/>
    <rect x="2" y="90" width="240" height="20" style="fill: red">
         <animate attributeName="width" attributeType="XML" from="240" to="356" 
          begin="1s" dur="5s" fill="freeze"/>
    </rect>
</g>
<g>
    <text x="280" y="30" style="font-size:20">Image 3</text>
</g>
</svg>