code: function _detectDivOverlayOptions(className) {
  	var el = L.DomUtil.create('div', className, document.body),
  	    anchorX = _getStyleInt(el, 'margin-left'),
  	    anchorY = _getStyleInt(el, 'margin-top');
  
  	el.parentNode.removeChild(el);
  
  	return {
  		Anchor: [anchorX, anchorY]
  	};
  }
docs: Retrieve anchor option values from CSS (popup or tooltip).