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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=utf-8>
  <title>Leap years — range</title>
</head>
<body>
  <h1>Leap years in [2024, 2050]</h1>
  <p><strong>Run</strong> to print the reference lines.</p>
  <pre id=out></pre>
  <script>
    (function () {
      function isLeapYear(year) {
        if (
          (year % 4 === 0 && year % 100 !== 0) ||
          year % 400 === 0
        ) {
          return true;
        }
        return false;
      }
      var startYear = 2024;
      var endYear = 2050;
      var lines = [];
      lines.push(
        "Leap years in the range " + startYear + " to " + endYear + ":"
      );
      var parts = [];
      var y;
      for (y = startYear; y <= endYear; y++) {
        if (isLeapYear(y)) {
          parts.push(String(y));
        }
      }
      lines.push(parts.join(" "));
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Leap Years — Range 2024–2050 (Try It)