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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>scheme — JavaScript</title>

  <meta id=legacyMeta name=identifier content=978-0134685991>

  <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}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}#out{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>HTMLMetaElement.scheme</h1>

  <button type=button id=runBtn>Set scheme="ISBN" on meta</button>

  <p id=out>Click to run setAttribute("scheme", "ISBN") on the meta element.</p>

  <script>document.getElementById("runBtn").addEventListener("click",(function(){var e=document.getElementById("legacyMeta");e.setAttribute("scheme","ISBN"),document.getElementById("out").textContent='meta.scheme = "'+e.scheme+'" — reflected in DOM but ignored by HTML5 metadata rules.'}))</script>

</body>

</html>

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HTML scheme Attribute — JavaScript HTMLMetaElement.scheme