HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>low — fuel gauge</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}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>low — fuel level</h1>
  <meter value=18 min=0 max=100 low=25 high=75 optimum=80>18%</meter>
  <p class=hint>18% is below <code>low="25"</code>, so the browser shows the low (warning) segment. Above 25, the reading leaves the low zone.</p>
</body>
</html>

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HTML low Attribute — Fuel Gauge