HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>step — 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}label{display:block;font-weight:600;margin-bottom:.35rem}input[type=number]{padding:.45rem .55rem;border:1px solid #cbd5e1;border-radius:6px;font-size:1rem}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Dynamic step value</h1>



  <label for=dynamicStepField>Enter a number:</label>

  <input type=number id=dynamicStepField value=0>



  <script>document.getElementById("dynamicStepField").step="0.5"</script>



  <p class=hint>After the script runs, the spinner moves by <code>0.5</code> (0, 0.5, 1, 1.5, &hellip;).</p>

</body>

</html>

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HTML step Attribute — dynamic JavaScript