<html>
<body>
<canvas id="myCanvas" width="200" height="200" style="border:1px solid">
Your browser does not support the canvas element.
</canvas>
<script type="text/javascript">
var c=document.getElementById("myCanvas");
var cxt=c.getContext("2d");
cxt.fillStyle="#92B901";
cxt.fillRect(50,50,100,100);
</script>
</body>
</html>