<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1 Basic//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11-basic.dtd">
<svg version="1.1" baseProfile="basic" id="svg-root" width="100%" height="100%" viewBox="0 0 480 360"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     xmlns="http://www.w3.org/2000/svg" onload="myfunc()">
     <script>
     	function myfunc() {
     		var myRect = document.getElementById("rect");
     		myRect.setAttribute("fill", "green");
     	}
     </script>
     <rect id="rect" x="0" y="0" width="90" height="90" fill="red" />
</svg>