code: function removeCollapsedFromParents (element) {
      if (element.className.indexOf(options.collapsibleClass) !== -1 && element.className.indexOf(options.isCollapsedClass) !== -1) {
        element.className = element.className.split(SPACE_CHAR + options.isCollapsedClass).join('')
        return removeCollapsedFromParents(element.parentNode.parentNode)
      }
      return element
    }
docs: Remove collpased class from parent elements.
  @param {HTMLElement} element
  @return {HTMLElement}