HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>CSS color replacement</title>
  <style>
    body {
      color: #f8fafc;
      background-color: #0f172a;
      font-family: system-ui, sans-serif;
    }
  </style>
</head>
<body>
  <p>Text color from CSS (not document.fgColor)</p>
  <pre id="out"></pre>
  <script>
    document.body.style.color = "#f8fafc";
    document.getElementById("out").textContent =
      "body.style.color: " + document.body.style.color +
      "\n(prefer CSS over document.fgColor)";
  </script>
</body>
</html>

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CSS color instead of fgColor (Try It)