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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>valuetype — JavaScript example</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}pre{background:#1e293b;color:#e2e8f0;padding:.75rem 1rem;border-radius:8px;font-size:.8125rem;overflow-x:auto}button{margin-top:.75rem;margin-right:.5rem;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer;font:inherit}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}</style>

</head>

<body>

  <h1>Dynamic valuetype</h1>



  <object data=/files/honey-bee.pdf type=application/pdf width=300 height=120>

    <param id=paramElement name=src value=/files/honey-bee.pdf>

    <p>PDF fallback</p>

  </object>



  <button type=button onclick=setData()>valuetype = data</button>

  <button type=button onclick=setRef()>valuetype = ref</button>



  <pre id=status>Current: (default) data</pre>



  <script>var param=document.getElementById("paramElement"),status=document.getElementById("status");function setData(){param.setAttribute("valuetype","data"),status.textContent="Current: valuetype = data"}function setRef(){param.setAttribute("valuetype","ref"),status.textContent="Current: valuetype = ref"}</script>



  <p class=hint>Use <code>setAttribute("valuetype", ...)</code> when the interpretation of <code>value</code> must change at runtime.</p>

</body>

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HTML valuetype Attribute — dynamic change