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              html {
 overflow-y: scroll;
}

abbr[title] {
  display: inline-block;
  text-decoration: none;
}

.container {
  max-width: 42rem;
  padding: 2rem;
  margin: 0 auto;
  
  & &__title {
    font-size: 1.5rem;
    margin-bottom: 3rem;
  }
}

.accordionList {
  
  & &__list {
    padding: 0;
    list-style: none;
  }

  & &__item + &__item {
    border-top-width: 0;
  }

  & &__buttons {
    margin-bottom: 2rem;
  }
  
  & &__item + &__buttons {
    margin-top: 2rem;
    margin-bottom: 0;
  }

  & &__button {
    min-width: 6em;
    padding: .4em .8em;
    border: 0;
    border-radius: .2em;
    background-color: midnightblue;
    color: #fff;
  }
  
  & &__button + &__button {
    margin-left: 1em;
  }
}

.accordion {
  $transitionDuration: .2s;
  position: relative;
  overflow: hidden;
  border: .25em solid currentColor;
  color: midnightblue;
    
  & &__header {
    display: block;
    position: relative;
    margin: 0;
    background-color: #fff;
    font-size: 1rem;
    padding: 1em;
    transition: background-color $transitionDuration ease;
    
    &:hover,
    &:focus {
      text-decoration: underline;
      background-color: lighten(midnightblue, 70%);
    }
    
    &[aria-expanded="true"] {
      background-color: lighten(midnightblue, 65%);
    }

    &::before {
      content: "";
      box-sizing: border-box;
      display: inline-block;
      border-color: transparent;
      border-width: .4em .6em;
      border-style: solid;
      border-left-color: midnightblue;
      line-height: 1;
      transform-origin: 25% 50%;
      transition: transform $transitionDuration ease-out;
    }

    &[aria-expanded="true"]::before {
      transform-origin: 25% 50%;
      transform: rotate(90deg);
    }
  }
  
  & &__panel {
    box-sizing: border-box;
    height: 0;
    overflow: hidden;
    margin: -2em 0;
    padding: 3em 1em;
    visibility: hidden;
    transition: padding $transitionDuration ease-out;
  }
  
  & &__title:hover &__panel {
    will-change: padding;
  }

  & &__panel[aria-hidden="true"] {
    margin: 0;
    padding: 0 1em;
    transition-duration: $transitionDuration;
  }

  & &__panel > *:first-child {
    margin-top: 0;
  }

  & &__panel > *:last-child {
    margin-bottom: 0;
  }

  // for expanded accordion in closed accordion can't be focused
  & &__panel[aria-hidden="true"] * {
    visibility: hidden;
  }
}
            
          
!
            
              const KEYCODE_ENTER  = 13;
const KEYCODE_SPACE  = 32; 
const KEYCODE_LEFT   = 37;
const KEYCODE_UP     = 38;
const KEYCODE_RIGHT  = 39;
const KEYCODE_DOWN   = 40;

class AccordionList extends React.Component {
  
  constructor(props) {
    super(props);

    // 開閉の状態は AccordionList が Bool の値を配列で持つ。
    let items = [];
    
    // AccordionList の子の Accordion の数によって state の初期化方法を変える
    if(Array.isArray(this.props.children)) {
        this.props.children.forEach((child, i) => {
        items[i] = child.props.expanded === undefined ? false : child.props.expanded;
      });
    } else {
      items.push(this.props.expanded === undefined ? false : child.props.expanded);
    }

    // AccordionList から Accordion のフォーカスも管理する
    let focusItems = new Array(this.props.children.length);
    focusItems.fill(false);

    this.state = {
      expandsItems: items,
      focusItems: focusItems
    }
  }
  
  // すべて開く処理
  expandsAllItems() {
    this.setState({
      expandsItems: this.state.expandsItems.map(() => {
        return true;
      })
    });
  }
  
  // すべて閉じる処理
  closeAllItems() {
    this.setState({
      expandsItems: this.state.expandsItems.map(() => {
        return false;
      })
    });
  }
  
  // 渡された index の 表示状態をトグル
  handleExpandsItem(i) {
    let items = this.state.expandsItems;
    items[i] = items[i] === false ? true : false;
    this.setState({
      expandsItems: items
    });
  }
  
  // focus を反映したら状態をリセットする。
  resetFocusItem() {
    this.setState({
      focusItems: this.state.focusItems.map(() => {
          return false;
        })
    })
  }
  
  // 受け取った index と KeyDownイベントからパネルのトグル or フォーカスを移動
  handleFocusItem(i, e) {
    switch(e.keyCode) {
      case KEYCODE_LEFT:
      case KEYCODE_UP:
        e.preventDefault();
        if(i !== 0) {
          this.setState({
            focusItems: this.state.focusItems.map((items, j) => {
                return i - 1 === j ? true : false;
              })
          }, () => {
            this.resetFocusItem();
          });
        }
        break;
      case KEYCODE_DOWN:
      case KEYCODE_RIGHT:
        e.preventDefault();
        if(i < this.state.expandsItems.length - 1) {
          this.setState({
            focusItems: this.state.focusItems.map((items, j) => {
                return i + 1 === j ? true : false;
              })
          }, () => {
            this.resetFocusItem();
          });
        }
        break;
      case KEYCODE_ENTER:
      case KEYCODE_SPACE:
        e.preventDefault();
        this.handleExpandsItem(i)
        break;
      default:
        break;
    }
  }
  
  render() {
    let items = [];
    let buttons;

    if(this.state.expandsItems.length < 2) {
      items.push(this.props.children);
    } else {
      items = this.props.children;

      if(this.props.allButton === undefined ? true : this.props.allButton) {

        // 子要素の id を空白区切りでまとめた ID 参照リストを作成
        const buttonControlItems = this.props.children.map((child) => {
          return child.props.id;
        }).join(' ');

        buttons = <div className={this.props.className + '__buttons'} role="toolbar">
            <button type="button"
              className={this.props.className + '__button'}
              onClick={this.expandsAllItems.bind(this)}
              aria-controls={buttonControlItems}>All Expand
            </button>
            <button type="button"
              className={this.props.className + '__button'}
              onClick={this.closeAllItems.bind(this)}
              aria-controls={buttonControlItems}>All Close
            </button>
          </div>;
        }
    }

    items = items.map((child, i) => {
      return (
        <Accordion
          label={child.props.label}
          id={child.props.id}
          dataNum={i}
          ref={this.props.id + i}
          key={this.props.id + i}
          focus={this.state.focusItems[i]}
          className={this.props.className + '__item'}
          expanded={this.state.expandsItems[i]}
          onButtonClick={this.handleExpandsItem.bind(this)}
          onButtonKeyDown={this.handleFocusItem.bind(this)}>
          {child.props.children}
        </Accordion>
      );
    });

    return (
      <div className={this.props.className} id={this.props.id}>
        {buttons}
        <ul className={this.props.className + '__list'} role="tablist" aria-multiselectable="true">
        {items}
        </ul>
      </div>
    );
  }
}

class Accordion extends React.Component {
  
  constructor(props) {
    super(props);
  };

  handleExpandItem(i) {
    this.props.onButtonClick(i);
  }

  handleKeyExpandItem(i, e) {
    this.props.onButtonKeyDown(i, e);
  }
  
  componentDidUpdate() {
    if(this.props.focus) {
      this.refs["accordion__header"].focus();
    }
  }
  

  render() {
    const viewStyle = {
      height: "auto",
      visibility: "visible"
    };
    const classBlockName = "accordion";

    return (
      <li className={this.props.className + ' ' + classBlockName} role="presentation">
        <a className={classBlockName + "__header"}
          ref={classBlockName + "__header"}
          onClick={this.handleExpandItem.bind(this, this.props.dataNum)}
          onKeyDown={this.handleKeyExpandItem.bind(this, this.props.dataNum)}
          role="tab"
          aria-expanded={this.props.expanded}
          aria-selected={this.props.expanded}
          aria-controls={this.props.id}
          tabIndex="0">{this.props.label}
        </a>
        <div className={classBlockName + "__panel"}
          id={this.props.id}
          aria-hidden={!this.props.expanded}
          style={this.props.expanded ? viewStyle : null}>
          {this.props.children}
        </div>
      </li>
    );
  }
}

class Container extends React.Component {
  render() {
    let text = <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Facere aut odit totam quas, doloribus, <a href="#dummy">laboriosam</a> eius deleniti, molestias doloremque debitis nisi quod eaque saepe similique ut voluptas ea neque dolores!</p>;

    return(
      <div className="container">
      <h1 className="container__title">Collapsible(Accordion) UI with React &amp; <abbr title="Web Accessibility Initiative - Accessible Rich Internet Applications">WAI-ARIA</abbr> role=&quot;tablist&quot;</h1>

      <AccordionList className="accordionList" allButton={true} id="AccordionList1" key="AccordionList1">
        <Accordion label="Accordion1" id="Accordion1" expanded={false}>
          {text}
        </Accordion>
        <Accordion label="Accordion2" id="Accordion2" expanded={false}>
          {text}
        </Accordion>
        <Accordion label="Accordion3" id="Accordion3" expanded={true}>
          {text}
          <AccordionList className="accordionList" allButton={false}>
            <Accordion label="Accordion in Accordion" id="Accordion3-1" key="Accordion3-1" expanded={false}>
              {text}
            </Accordion>
          </AccordionList>
        </Accordion>
      </AccordionList>
      </div>
    );
  }
}

ReactDOM.render(<Container />, document.getElementById('app'));
            
          
!
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