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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>data with JavaScript</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}data{font-weight:600;color:#15803d}button{margin-top:.75rem;padding:.5rem 1rem;border:none;border-radius:6px;background:#2563eb;color:#fff;font-size:.875rem;cursor:pointer}button:hover{background:#1d4ed8}.info{margin-top:.75rem;font-size:.875rem;color:#64748b}</style>
</head>
<body>
  <h1>Dynamic data Value</h1>
  <p>
    Stock price:
    <data id=stock-price value=150>$150</data>
  </p>
  <button type=button id=update-btn>Increase by $10</button>
  <p class=info>JavaScript reads <code>data.value</code> and updates the display.</p>

  <script>var stock=document.getElementById("stock-price"),btn=document.getElementById("update-btn");btn.addEventListener("click",(function(){var t=Number(stock.value)+10;stock.value=String(t),stock.textContent="$"+t}))</script>
</body>
</html>

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JavaScript and the data Element