HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>lineHeight cssNumber</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #text { max-width: 320px; font-size: 18px; border: 1px solid #ccc; padding: 10px; }
    button { margin: 8px 6px 0 0; padding: 8px 12px; cursor: pointer; }
    #out { margin-top: 12px; color: #7c3aed; font-weight: bold; }
  </style>
</head>
<body>
  <p id="text">Line height controls vertical spacing between lines of text. Unitless values multiply the font size.</p>
  <button type="button" id="tight">.css("lineHeight", 1.2)</button>
  <button type="button" id="loose">.css("lineHeight", 2)</button>
  <div id="out">lineHeight is in $.cssNumber since jQuery 1.4.3.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#tight").on("click", function() {
      $("#text").css("lineHeight", 1.2);
      $("#out").text("lineHeight set to 1.2 (unitless multiplier).");
    });
    $("#loose").on("click", function() {
      $("#text").css("lineHeight", 2);
      $("#out").text("lineHeight set to 2 — double-spaced feel.");
    });
  </script>
</body>
</html>

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jQuery.cssNumber — lineHeight unitless (Try It)