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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>value — 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}input{display:block;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font:inherit;width:100%;max-width:20rem}button{margin-top:.75rem;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 value</h1>



  <input id=dynamicField placeholder="Value appears here">



  <button type=button onclick=setValue()>Set value</button>



  <script>function setValue(){document.getElementById("dynamicField").value="DynamicValue"}</script>



  <p class=hint>Use the <code>.value</code> property in JavaScript to read or write the current field value.</p>

</body>

</html>

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HTML value Attribute — dynamic update