_outerHeight(element) {
      if (!element) {
        return 0;
      }
      const style = window.getComputedStyle(element);
      return element.offsetHeight + parseInt(style.marginTop) + parseInt(style.marginBottom);
    }
Calculates the outer height of a HTML element.

@param {HTMLElement} element The element which outer height to be calculated
@returns {number} Outer height of the passed HTML element