W3Schools Tryit Editor

<!DOCTYPE HTML>
<html>
<style>
#droptarget {
  width: 200px; 
  height: 35px;
  padding: 10px;
  border: 1px solid black;
}
</style>

<body>
<h1>HTML DOM Events</h1>
<h2>The ondragover Event</h2>

<p>Assign an "ondragstart" and "ondrag" event to a p element and an "ondragover" and "ondrop" event to a div element.</p>

<p ondragstart="dragStart(event)" ondrag="dragging(event)" draggable="true" id="dragtarget">Drag me into the rectangle!</p>

function dragging(event) {
  document.getElementById("demo").innerHTML = "The text is being dragged.";
}

function allowDrop(event) {
  event.preventDefault();
  document.getElementById("demo").innerHTML = "The text is OVER the droptarget.";
  event.target.style.border = "4px dotted purple";
}

function drop(event) {
  event.preventDefault();
  const data = event.dataTransfer.getData("Text");
  event.target.appendChild(document.getElementById(data));
  document.getElementById("demo").innerHTML = "The text was dropped.";
}
</script>

</body>
</html>

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<!DOCTYPE HTML><html><style>#droptarget {  width: 200px;   height: 35px;  padding: 10px;  border: 1px solid black;}</style>​<body><h1>HTML DOM Events</h1><h2>The ondragover Event</h2>​<p>Assign an "ondragstart" and "ondrag" event to a p element and an "ondragover" and "ondrop" event to a div element.</p>​<p ondragstart="dragStart(event)" ondrag="dragging(event)" draggable="true" id="dragtarget">Drag me into the rectangle!</p>​<div id="droptarget" ondragover="allowDrop(event)" ondrop="drop(event)"></div>​<p id="demo"></p>​<script>function dragStart(event) {  event.dataTransfer.setData("Text", event.target.id);}​function dragging(event) {  document.getElementById("demo").innerHTML = "The text is being dragged.";}​function allowDrop(event) {  event.preventDefault();  document.getElementById("demo").innerHTML = "The text is OVER the droptarget.";  event.target.style.border = "4px dotted purple";}​function drop(event) {  event.preventDefault();  const data = event.dataTransfer.getData("Text");  event.target.appendChild(document.getElementById(data));  document.getElementById("demo").innerHTML = "The text was dropped.";