<?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%"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     xmlns="http://www.w3.org/2000/svg" onload="myfunc()">
     <script>
         function myfunc() {
             var meta = document.createElementNS("http://www.w3.org/2000/svg", "metadata");
             if([meta] == "[object SVGMetadataElement]") {
                 document.getElementById("rect").setAttributeNS(null, "display", "visible");}
         }
     </script>
     <rect id="rect" width="100" height="100" fill="green" display="none"/>
</svg>