A jQuery method that attempts to calculate the angle of rotation of the given HTML element.

getPureRotation.js

$.fn.getPureRotation = function(element) {
	var degrees = null;
	$.each(['-webkit-transform', '-moz-transform', '-o-transform', '-sand-transform', '-ms-transform', 'transform'], function(index, value) {
		var matrix = $(element).css(value);
		if(degrees == null || Boolean(matrix)) {
			var arrMatrix = matrix.match(/[\-0-9.]+/g);
			if(
				(parseFloat(arrMatrix[1]) == (-1 * parseFloat(arrMatrix[2]))) ||
				(parseFloat(arrMatrix[3]) == parseFloat(arrMatrix[0])) ||
				((parseFloat(arrMatrix[0]) * parseFloat(arrMatrix[3]) - parseFloat(arrMatrix[2]) * parseFloat(arrMatrix[1])) == 1)
			) {
				degrees = Math.round(Math.acos(parseFloat(arrMatrix[0])) * 180 / Math.PI);
			} else {
				degrees = 0;
			}
		}
	});
	return degrees;
};

Hi there just to let you know this doesnt work for values over 180 (it gives 360-rotation) e.g. rotating 185 gives 175

and negative values are return correctly but positive