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<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
html, body {
margin: 0;
font-size: 1.2em;
overflow: scroll;
-webkit-overflow-scrolling: touch;
}
#target {
width: 2000px;
height: 300px;
background-color: gray;
}
code {
color: green;
}
</style>
<div id="target"></div>
<img src="large-red-square.png"></img>
<script>
target.addEventListener("dragenter", event => event.preventDefault());
target.addEventListener("dragover", event => event.preventDefault());
target.addEventListener("drop", event => {
target.innerHTML = "<code>PASS</code>";
event.preventDefault();
});
</script>
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