HTML Code
<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>drag and drop zone</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}.layout{display:flex;flex-wrap:wrap;gap:1rem;align-items:flex-start}#dragItem{width:100px;height:100px;background:#2563eb;color:#fff;display:flex;align-items:center;justify-content:center;border-radius:8px;cursor:grab;user-select:none;font-size:.8125rem;font-weight:600}#dropZone{min-width:180px;min-height:120px;padding:1rem;border:2px dashed #cbd5e1;border-radius:8px;background:#fff;font-size:.875rem;color:#64748b}#dropZone.is-over{border-color:#2563eb;background:#eff6ff;color:#1d4ed8}p{font-size:.875rem;color:#64748b;max-width:560px;margin-top:1rem}</style>

</head>

<body>

  <h1>Draggable + drop zone</h1>

  <div class=layout>

    <div id=dragItem draggable=true>Drag me</div>

    <div id=dropZone>Drop here</div>

  </div>

  <p>The attribute starts the drag. <code>dragover</code> and <code>drop</code> handlers complete the interaction.</p>

  <script>var dragItem=document.getElementById("dragItem"),dropZone=document.getElementById("dropZone");dragItem.addEventListener("dragstart",(function(e){e.dataTransfer.setData("text/plain","moved"),dragItem.style.opacity="0.5"})),dragItem.addEventListener("dragend",(function(){dragItem.style.opacity="1"})),dropZone.addEventListener("dragover",(function(e){e.preventDefault(),dropZone.classList.add("is-over")})),dropZone.addEventListener("dragleave",(function(){dropZone.classList.remove("is-over")})),dropZone.addEventListener("drop",(function(e){e.preventDefault(),dropZone.classList.remove("is-over"),dropZone.textContent="Dropped!",dropZone.appendChild(dragItem)}))</script>

</body>

</html>
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HTML draggable Attribute — Drag and Drop Zone
