focus.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Multi-Canvas DEMO</title>
    <style>
    html, body {
        height: 100%;
        width: 100%;
        margin: 10px;
        overflow: hidden;
        color: #222;
        font-size: 15px;
        letter-spacing: 1.5px;
        line-height: 1.5em;
    }
    * {
        box-sizing: border-box;
    }
    canvas {
        background: transparent;
        position: absolute;
        transition: filter .5s;
    }

    #canvContainer {
        position: relative;
        height: 500px;
        opacity: 0;
        transition: opacity .8s;
    }
    #focusRange {
        width: 300px;
    }
    </style>

</head>
<body>
    <script type="text/javascript" src="src/multicanvas.js"></script>
    <div id="canvContainer">        
    </div>
    <label for="focusRange" id="focusLabel"></label><br>
    <input type="range" name="focusRange" id="focusRange" min="0" max="10" value="0">
    <script type="text/javascript">
        var range = document.querySelector("#focusRange");
        var label = document.querySelector("#focusLabel");
        var mcanv = new MultiCanvas({
            'images': 'assets/MultiCanvas_',
            'imageSuffix': [4,3,2,1],
            'imageType': 'png',
            'focusRange': range,
            'focusLabel': label,
        });
    </script>
</body>