JSFiddle - React, Tailwind, and code Playground

by Clare12345

HTML

<div class="container"> <div class="accordion"> <dl> <dt> <a href="#accordion1" aria-expanded="false" aria-controls="accordion1" class="accordion-title accordionTitle js-accordionTrigger"></a> </dt> <dd class="accordion-content accordionItem is-collapsed" id="accordion1" aria-hidden="true"> <p>Lorem ipsum </p> </dd> </dl> </div> </div>

CSS

/* ------------- Accordion --------------- */

* {
  box-sizing: border-box;
}

.accordion dl, .accordion-list {
    border: 0px solid #ddd;
    background: #252B30;
}
.accordion dl:after,
.accordion-list:after {
  content: "";
  display: block;
  height: 1em;
  width: 100%;
  background-color: #252B30;
}

.accordion dd,
.accordion__panel {
  background-color: #eee;
  font-size: 1em;
  line-height: 1.5em;
}

.accordion p {
  padding: 1em 2em 1em 2em;
}

.accordion {
  position: relative;
  background-color: #eee;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2em 0 2em 0;
}

.accordionTitle,
.accordion__Heading {
  background-color: #252B30;
  text-align: center;
  font-weight: 700;
  padding: 2em;
  display: block;
  text-decoration: none;
  color: #fff;
  -webkit-transition: background-color 0.5s ease-in-out;
  transition: background-color 0.5s ease-in-out;
  border-bottom: 0px solid #30bb64;
}
.accordionTitle:before,
.accordion__Heading:before {
  content: "\203A";
  font-size: 2.5em;
  line-height: 0.5em;
  float: left;
  -webkit-transition: -webkit-transform 0.2s ease-in-out;
  transition: -webkit-transform 0.2s ease-in-out;
  transition: transform 0.2s ease-in-out;
  transition: transform 0.2s ease-in-out, -webkit-transform 0.2s ease-in-out;
  text-align: center;
  width: 100%;
    -webkit-transform: rotate(90deg);
          transform: rotate(90deg);
      color: #999;
    color: #CC1629;
}

.accordionTitleActive,
.accordionTitle.is-expanded {
  background-color: #252B30;
}
.accordionTitleActive:before,
.accordionTitle.is-expanded:before {
  -webkit-transform: rotate(-90deg);
          transform: rotate(-90deg);
}

.accordionItem {
  height: auto;
  overflow: hidden;
  max-height: 50em;
  -webkit-transition: max-height 1s;
  transition: max-height 1s;
}
@media screen and (min-width: 48em) {
  .accordionItem {
    max-height: 15em;
    -webkit-transition: max-height 0.5s;
    transition: max-height 0.5s;
  }
}

.accordionItem.is-collapsed...

JavaScript

//uses classList, setAttribute, and querySelectorAll
//if you want this to work in IE8/9 youll need to polyfill these
(function($){
	var d = document,
	accordionToggles = d.querySelectorAll('.js-accordionTrigger'),
	setAria,
	setAccordionAria,
	switchAccordion,
  touchSupported = ('ontouchstart' in window),
  pointerSupported = ('pointerdown' in window);
  
  skipClickDelay = function(e){
    e.preventDefault();
    e.target.click();
  }

		setAriaAttr = function(el, ariaType, newProperty){
		el.setAttribute(ariaType, newProperty);
	};
	setAccordionAria = function(el1, el2, expanded){
		switch(expanded) {
      case "true":
      	setAriaAttr(el1, 'aria-expanded', 'true');
      	setAriaAttr(el2, 'aria-hidden', 'false');
      	break;
      case "false":
      	setAriaAttr(el1, 'aria-expanded', 'false');
      	setAriaAttr(el2, 'aria-hidden', 'true');
      	break;
      default:
				break;
		}
	};
//function
switchAccordion = function(e) {
	e.preventDefault();
	var thisAnswer = e.target.parentNode.nextElementSibling;
	var thisQuestion = e.target;
	if(thisAnswer.classList.contains('is-collapsed')) {
		setAccordionAria(thisQuestion, thisAnswer, 'true');
	} else {
		setAccordionAria(thisQuestion, thisAnswer, 'false');
	}
  	thisQuestion.classList.toggle('is-collapsed');
  	thisQuestion.classList.toggle('is-expanded');
		thisAnswer.classList.toggle('is-collapsed');
		thisAnswer.classList.toggle('is-expanded');
 	
  	thisAnswer.classList.toggle('animateIn');
	};
	for (var i=0,len=accordionToggles.length; i<len; i++) {
		if(touchSupported) {
      accordionToggles[i].addEventListener('touchstart', skipClickDelay, false);
    }
    if(pointerSupported){
      accordionToggles[i].addEventListener('pointerdown', skipClickDelay, false);
    }
    accordionToggles[i].addEventListener('click', switchAccordion, false);
  }
})();