code: function getOuterSizes(element) {
    const window = element.ownerDocument.defaultView;
    const styles = window.getComputedStyle(element);
    const x = parseFloat(styles.marginTop || 0) + parseFloat(styles.marginBottom || 0);
    const y = parseFloat(styles.marginLeft || 0) + parseFloat(styles.marginRight || 0);
    const result = {
      width: element.offsetWidth + y,
      height: element.offsetHeight + x
    };
    return result;
  }
docs: Get the outer sizes of the given element (offset size + margins)
  @method
  @memberof Popper.Utils
  @argument {Element} element
  @returns {Object} object containing width and height properties