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<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body, html {
margin: 0;
width: 100%;
height: 100%;
font-family: -apple-system;
}
body {
margin: 0;
}
#source, #destination {
width: 200px;
height: 200px;
box-sizing: border-box;
border: 1px gray solid;
}
#item {
width: 100%;
height: 100%;
background-color: red;
}
</style>
<body>
<div id="source">
<div draggable="true" id="item"></div>
</div>
<div id="destination"></div>
<div id="description">
<div>To manually test, drag and drop the red square in the top container into the bottom container.</div>
<div>Upon drop, the square should turn green and show "PASS" as text.</div>
</div>
</body>
<script>
item.addEventListener("dragstart", event => event.dataTransfer.setData("text/plain", item.id));
destination.addEventListener("dragenter", event => event.preventDefault());
destination.addEventListener("dragover", event => event.preventDefault());
destination.addEventListener("drop", event => {
let identifier = event.dataTransfer.getData("text/plain");
let sourceItem = document.getElementById(identifier);
if (!sourceItem)
return;
sourceItem.style.backgroundColor = "green";
sourceItem.style.color = "white";
sourceItem.innerHTML = "<code>PASS</code>";
destination.appendChild(sourceItem);
event.preventDefault();
});
</script>
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