<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width">
        <style>
        body {
            width: 100%;
            height: 100%;
            margin: 0;
        }

        img {
            height: 200px;
        }

        #source, #target {
            width: 100%;
            height: 200px;
            font-size: 150px;
            white-space: nowrap;
            box-sizing: border-box;
        }

        #target {
            border: green 1px dashed;
            color: green;
            border-width: 5px;
        }
        </style>
</head>

<body>
    <div contenteditable id="source"><img src="icon.png"></img></div>
    <code><div id="target"></div></code>
    <script>
    target.addEventListener("dragenter", event => event.preventDefault());
    target.addEventListener("dragover", event => event.preventDefault());
    target.addEventListener("drop", event => {
        target.textContent = "PASS";
        event.preventDefault();
    });
    </script>
</body>
</html>