​x
 
<!DOCTYPE html>
<html>
<body>
​
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
​
<script type="text/javascript">
​
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.shadowBlur=20;
ctx.shadowColor="black";
ctx.fillStyle="blue";
ctx.fillRect(20,20,100,80);
​
</script>
​
</body>
</html>
​