SVG feMerge and feMergeNode Elements

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">

<defs>
<filter id="test" filterUnits="objectBoundingBox"
x="0" y="0" width="1.5" height="4">

<feOffset result="Off1" dx="15" dy="20"/>
<feFlood style="flood-color:#ff0000;flood-opacity:0.8"/>
<feComposite in2="Off1" operator="in" result="C1"/>

<feOffset in="SourceGraphic" result="Off2" dx="30" dy="40"/>
<feFlood style="flood-color:#ff0000;flood-opacity:0.4"/>
<feComposite in2="Off2" operator="in" result="C2"/>

<feMerge>
  <feMergeNode in="C2"/>
  <feMergeNode in="C1"/>
  <feMergeNode in="SourceGraphic"/>
</feMerge>

</filter>
</defs>

<text x="30" y="100"
style="font:36px verdana bold;fill:blue;filter:url(#test)">
This is some text!</text>

</svg>