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  a.breadcrumb__step.breadcrumb__step--active(href='#') ECMAScript
  a.breadcrumb__step(href='#') HTML5
  a.breadcrumb__step(href='#') Node.js
  a.breadcrumb__step(href='#') Linux



  background #FCE4EC
  height 100vh
  display flex
  justify-content center
  align-items center

/* ------------------------- Separate line ------------------------- */

  --breadcrumb-theme-1 #E91E63  // color | background active
  --breadcrumb-theme-2 #FFFFFF  // background | color active
  --breadcrumb-theme-3 #E91E63 - #111  // hover
  --breadcrumb-theme-4 #E91E63 - #222  // arrow

  text-align center
  display inline-block
  box-shadow 0 2px 5px rgba(0, 0, 0, 0.25)
  overflow hidden
  border-radius 5px
  counter-reset flag

    text-decoration none
    outline none
    display block
    float left
    font-size 12px
    line-height 36px
    padding 0 10px 0 60px
    position relative
    background var(--breadcrumb-theme-2)
    color var(--breadcrumb-theme-1)
    transition background .5s

      padding-left 46px
      border-radius 5px 0 0 5px

        left 14px

      border-radius 0 5px 5px 0
      padding-right 20px

        content none

    // circle
      content counter(flag)
      counter-increment flag
      border-radius 100%
      width 20px
      height 20px
      line-height 20px
      margin 8px 0
      position absolute
      top 0
      left 30px
      font-weight bold
      background var(--breadcrumb-theme-2)
      box-shadow 0 0 0 1px var(--breadcrumb-theme-1)

    // arrow
      content ''
      position absolute
      top 0
      right -18px
      width 36px
      height 36px
      transform scale(0.707) rotate(45deg)
      z-index 1
      border-radius 0 5px 0 50px
      background var(--breadcrumb-theme-2)
      transition background 0.5s
      box-shadow 2px -2px 0 2px var(--breadcrumb-theme-4)

      color var(--breadcrumb-theme-2)
      background var(--breadcrumb-theme-1)

        color var(--breadcrumb-theme-1)

        background var(--breadcrumb-theme-1)

      color var(--breadcrumb-theme-2)
      background var(--breadcrumb-theme-3)

        color var(--breadcrumb-theme-1)

        color var(--breadcrumb-theme-1)
        background var(--breadcrumb-theme-3)



                const $ = (selector: string): HTMLElement | null =>

const $$ = (selector: string): NodeList<HTMLElement> =>

const breadcrumb: HTMLElement = $('.breadcrumb');
const breadcrumbSteps: NodeList<HTMLElement> = $$('.breadcrumb__step');

  (item: HTMLElement, index: number, array: HTMLElement[]): void => {
    item.onclick = (): void => {
      for (let i = 0, l = array.length; i < l; i++) {
        if (index >= i) {
        } else {