HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>custom cssNumber property</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #box {
      width: 100px; height: 100px; background: #8b5cf6; color: #fff;
      display: flex; align-items: center; justify-content: center;
      margin: 12px 0;
    }
    button { padding: 8px 12px; cursor: pointer; margin-right: 6px; }
    #out { margin-top: 12px; color: #5b21b6; font-weight: bold; }
  </style>
</head>
<body>
  <div id="box">Spin</div>
  <button type="button" id="go">.css("rotateDeg", 90)</button>
  <button type="button" id="reset">Reset</button>
  <div id="out">Official pattern: if ($.cssNumber) { $.cssNumber.rotateDeg = true; }</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function($) {
      $(function() {
        if ($.cssNumber) {
          $.cssNumber.rotateDeg = true;
        }
        $.cssHooks.rotateDeg = {
          get: function(elem) {
            var m = (elem.style.transform || "").match(/rotate\(([-\d.]+)deg\)/);
            return m ? parseFloat(m[1]) : 0;
          },
          set: function(elem, value) {
            elem.style.transform = "rotate(" + parseFloat(value) + "deg)";
          }
        };
        $("#go").on("click", function() {
          $("#box").css("rotateDeg", 90);
          $("#out").text("rotateDeg = " + $("#box").css("rotateDeg") + " (unitless, no px appended)");
        });
        $("#reset").on("click", function() {
          $("#box").css("rotateDeg", 0);
          $("#out").text("Reset to 0 degrees.");
        });
      });
    })(jQuery);
  </script>
</body>
</html>

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jQuery.cssNumber — add custom property (Try It)