HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>low — 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{width:100%;max-width:360px;height:1.25rem}button{margin-top:.75rem;font:inherit;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>low — dynamic JS</h1>
  <meter id=dynamicMeter value=30 min=0 max=100 low=20 high=80 optimum=90>30%</meter>
  <button type=button id=setLowBtn>Set low to 35</button>
  <p class=status id=status>Current low: 20. Value 30 is above low (moderate zone).</p>

  <script>var meter=document.getElementById("dynamicMeter"),status=document.getElementById("status");document.getElementById("setLowBtn").addEventListener("click",(function(){meter.low=35,status.textContent="low set to 35 via meter.low. Value 30 is now in the low segment."}))</script>
</body>
</html>

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HTML low Attribute — Dynamic low Value