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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dragover_event below:

HTMLElement: dragover event - Web APIs

Baseline Widely available

The dragover event is fired when an element or text selection is being dragged over a valid drop target (every few hundred milliseconds).

This event is cancelable and may bubble up to the Document and Window objects.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("dragover", (event) => { })

ondragover = (event) => { }

In addition to the properties listed below, properties from the parent interface, Event, are available.

DragEvent.dataTransfer Read only

The data that is transferred during a drag-and-drop interaction.

In this example, we have a draggable element inside a container. Try grabbing the element, dragging it over the other container, and releasing it.

We use three event handlers here:

• in the dragstart event handler, we get a reference to the element that the user dragged
• in the dragover event handler for the target container, we call event.preventDefault(), which enables it to receive drop events.
• in the drop event handler for the drop zone, we handle moving the draggable element from the original container to the drop zone.

For a complete example of drag and drop, see the page for the drag event.

<div class="dropzone">
  <div id="draggable" draggable="true">This div is draggable</div>
</div>
<div class="dropzone" id="drop-target"></div>

body {
  /* Prevent the user from selecting text in the example */
  user-select: none;
}

#draggable {
  text-align: center;
  background: white;
}

.dropzone {
  width: 200px;
  height: 20px;
  background: blueviolet;
  margin: 10px;
  padding: 10px;
}

let dragged = null;

const source = document.getElementById("draggable");
source.addEventListener("dragstart", (event) => {
  // store a ref. on the dragged elem
  dragged = event.target;
});

const target = document.getElementById("drop-target");
target.addEventListener("dragover", (event) => {
  // prevent default to allow drop
  event.preventDefault();
});

target.addEventListener("drop", (event) => {
  // prevent default action (open as link for some elements)
  event.preventDefault();
  // move dragged element to the selected drop target
  if (event.target.className === "dropzone") {
    dragged.parentNode.removeChild(dragged);
    event.target.appendChild(dragged);
  }
});

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