<!DOCTYPE HTML>
<html>
<head>
    <style>
        div {
            width: 100px;
            height: 100px;
            margin: 10px;
            display: inline-block;
        }
        img {
            width: 100px;
            height: 100px;
        }
    </style>
<head>
<body>
<script>
    if (window.internals)
        window.internals.settings.setImageSubsamplingEnabled(true);

    function createImage(color) {
        var canvas = document.createElement("canvas");
        canvas.width = 1024 * 3;
        canvas.height = 1024 * 3;
        var ctx = canvas.getContext("2d");
        ctx.fillStyle = color;
        ctx.fillRect(0, 0, canvas.width, canvas.height);

        var imgElement = document.createElement("img");
        imgElement.src = canvas.toDataURL("image/png");

        var divElement = document.createElement("div");
        divElement.appendChild(imgElement);
        document.body.appendChild(divElement);
    }
    
    createImage("red");
    createImage("green");
    createImage("blue");
</script>
</body>
</html>