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Rendering Shadows on Canvas

Published : November 17, 2014   •   Last Edited : November 24, 2025   •   Author : Adam Khoury
In this exercise you can learn the JavaScript properties behind creating shadow effects on the canvas element. 
<!DOCTYPE html>
<html>
<head>
<style>
body{ margin:10px; background:#666; }
#my_canvas{ background:#FFF; border:#000 1px solid; }
</style>
<script>
function draw(){
    var ctx = document.getElementById('my_canvas').getContext('2d');
    // shadowColor = color || hex || rgba()
    // shadowOffsetX = positive or negative number
    // shadowOffsetY = positive or negative number
    // shadowBlur = positive number
    ctx.fillStyle = '#FC0';
    ctx.fillRect(50, 50, 100, 100);
    ctx.shadowColor = 'rgba(0,0,0,1)';
    ctx.shadowOffsetX = 2;
    ctx.shadowOffsetY = 2;
    ctx.shadowBlur = 3;
    ctx.fillRect(200, 50, 100, 100);
}
window.onload = draw;
</script>
</head>
<body>
<canvas id="my_canvas" width="500" height="350"></canvas>
</body>  
</html>
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