HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Multiple Selection</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 1rem;font-size:1.25rem;color:#0f172a}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:500;color:#475569}select{width:100%;max-width:280px;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font-size:.9375rem;font-family:inherit;background:#fff}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:360px}</style>

</head>

<body>

  <h1>Multiple selection</h1>

  <label for=colors>Choose colors (hold Ctrl or Cmd):</label>

  <select id=colors name=colors multiple size=4>

    <option value=red>Red</option>

    <option value=green>Green</option>

    <option value=blue>Blue</option>

  </select>

  <p class=hint>Add size for a better multi-select experience than a collapsed dropdown.</p>

</body>

</html>

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HTML select Tag — Multiple Selection