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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>ondragenter — dynamic</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}.drag-box{display:inline-block;padding:1rem 1.25rem;border:2px solid #cbd5e1;border-radius:8px;background:#fff;cursor:grab;user-select:none;max-width:420px}.drag-box:active{cursor:grabbing}.drop-zone{margin-top:1rem;padding:1.25rem;border:2px dashed #94a3b8;border-radius:8px;background:#f1f5f9;max-width:420px;min-height:3rem}.drop-zone.over{border-color:#3b82f6;background:#eff6ff}.log{margin-top:1rem;padding:.75rem 1rem;background:#fef9c3;border:1px solid #fde047;border-radius:8px;font-size:.8125rem;max-width:420px}</style>

</head>

<body>

  <h1>Dynamic ondragenter</h1>

  <p>Drag the box into the drop zone. The handler was assigned with JavaScript.</p>

  <div class=drag-box draggable=true>Draggable source</div>

  <div class=drop-zone id=dynamicDropTarget>Dynamic drop target</div>

  <div class=log id=log>Drag into the zone to see dragenter status.</div>



  <script>var target=document.getElementById("dynamicDropTarget");target.addEventListener("dragover",(function(e){e.preventDefault()})),target.ondragenter=function(e){target.classList.add("over"),document.getElementById("log").textContent="Dynamic ondragenter handler ran — pointer entered the target."},target.ondragleave=function(e){target.contains(e.relatedTarget)||target.classList.remove("over")}</script>

</body>

</html>

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HTML ondragenter Attribute — Dynamic Handler