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  <meta charset=UTF-8>

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

  <title>optimum — dynamic JS</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}meter{display:block;width:100%;max-width:420px;margin-bottom:.75rem}#status{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px;background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}</style>

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<body>

  <h1>meter.optimum = 90</h1>

  <p>Score meter — optimum set by script on load.</p>

  <meter id=dynamicMeter value=85 min=0 max=100>85%</meter>

  <p id=status aria-live=polite>optimum: setting…</p>



  <script>var meter=document.getElementById("dynamicMeter");meter.optimum=90,document.getElementById("status").textContent="value: "+meter.value+" — optimum: "+meter.optimum</script>

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HTML optimum Attribute — dynamic meter.optimum