<!DOCTYPE html>
<html lang="en-US">
<body>
<svg height="100" width="200">
<filter id="point" y="0" x="0" width="100%" height="100%">
<feTurbulence baseFrequency=".05" numOctaves="3" result="B"/>
<feComposite in2="B" in="SourceGraphic" operator="in" />
</filter>
<rect width="200" height="100" style="fill:green" filter="url(#point)"/>
</svg>
</body>
</html>