Shadow Color Attribute of Canvas in HTML5 
 
This attribute specifies the color of the shadow. We can define it by the shadowOffsetX, shadowOffsetY, and the shadowBlur property. 
 
Here we discuss the shadowBlur Property.
     - <canvas id="myfirstCanvas" width="250" height="150" style="border:1px solid;#d3d3d3;"></canvas>  
- <script type="text/javascript">  
- var mycanvas=document.getElementById("myfirstCanvas");  
- var x=mycanvas.getContext("2d");  
- x.rect(20,30,40,50);  
- x.fillStyle="pink";  
- x.shadowColor="black";  
- x.shadowBlur=20;  
- x.fill();  
- </script>undefined</body>undefined</html>