jQuery2js.js

const itemSelector = '[class*="tabs_item"]'

const findParents = ({ initialElement }) => {
  let count = 0
  let element = initialElement
  
  while (element.parentNode) {
    count++
    element = element.parentNode
  }
  
  return {
    element,
    count
  }
}

const tabItems = ({ tabsParent, itemSelector }) => {
  const parent = document.querySelectorAll(tabsParent)
  const children = parent.querySelectorAll(itemSelector)
  const firstChild = children && children[0]
  const { count: itemLength } = findParents({ initialElement: firstChild })
  return children.filter(element => {
    const { count } = findParents({ initialElement: element })
    return count === itemLength
  })
}