function _isFixed (element) {
    var p = element.parentNode;

    if (!p || p.nodeName === 'HTML') {
      return false;
    }

    if (_getPropValue(element, 'position') == 'fixed') {
      return true;
    }

    return _isFixed(p);
  }
Checks to see if target element (or parents) position is fixed or not

@api private
@method _isFixed
@param {Object} element
@returns Boolean