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html5_and_javascript_animation
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01-skeleton.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <canvas id="canvas" width="400" height="400"></canvas>
    <script src="utils.js"></script>
    <script>
        window.onload = function(){
            var canvas = document.getElementById('canvas')
            canvas.addEventListener('mousedown', function(event){
                console.log('mouse down')
            });

            canvas.addEventListener('mouseup', function(event){
                console.log('mouse up')
            })
        }
    </script>
</body>
</html>