HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>multiple — select</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}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}select{width:100%;max-width:320px;padding:.5rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}.hint,.result{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>multiple on &lt;select&gt;</h1>

  <label for=fruits>Favorite fruits (hold Ctrl or Cmd to select several):</label>

  <select id=fruits name=fruits multiple size=5>

    <option value=apple>Apple</option>

    <option value=banana>Banana</option>

    <option value=orange>Orange</option>

    <option value=grape>Grape</option>

    <option value=mango>Mango</option>

  </select>

  <p class=result id=result>Selected: (none yet)</p>

  <p class=hint>The <code>multiple</code> attribute lets the same &lt;select&gt; return more than one value on submit.</p>



  <script>var sel=document.getElementById("fruits"),result=document.getElementById("result");function update(){var e=Array.from(sel.selectedOptions).map((function(e){return e.text}));result.textContent=e.length?"Selected: "+e.join(", "):"Selected: (none yet)"}sel.addEventListener("change",update),update()</script>

</body>

</html>

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HTML multiple Attribute — Multi-Select Dropdown