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HTML

              
                <link href='https://fonts.googleapis.com/css?family=Old+Standard+TT' rel='stylesheet' type='text/css'>

<div class="wrap">
	
    <h1 class="heading">The NO-JS Accordion Experiment Using :checked, general sibling, and CSS3 transitions</h1>
	
    <ul class="accordion js-accordion">
        <li class="accordion-item">
            <input class="accordion-item-input" type="checkbox" name="accordion" id="item1" />
            <label for="item1" class="accordion-item-hd js-accordionTrigger">Some Sort of heading for an example.<span class="accordion-item-hd-cta">&#9650;</span></label>
            <div class="accordion-item-bd">
				<div class="accordion-item-bd-wrap">
					Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ex consequuntur architecto maxime, saepe repudiandae quidem quisquam aliquam cumque possimus inventore, deserunt nostrum, explicabo modi voluptatibus sed, labore quaerat. Accusamus, officiis.
				</div>
            </div>
        </li>
        <li class="accordion-item">
            <input class="accordion-item-input" type="checkbox" name="accordion" id="item2" />
            <label for="item2" class="accordion-item-hd js-accordionTrigger">Some Sort of heading for an example.<span class="accordion-item-hd-cta">&#9650;</span></label>
            <div class="accordion-item-bd"><div class="accordion-item-bd-wrap">
					Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ex consequuntur architecto maxime, saepe repudiandae quidem quisquam aliquam cumque possimus inventore, deserunt nostrum, explicabo modi voluptatibus sed, labore quaerat. Accusamus, officiis.
				</div>
            </div>
        </li>
    </ul>
	
    <h2>Features</h2>
	
    <ul>
        <li>No JS</li>
        <li>Clean and Responsive</li>
        <li>Animation doesn't need a set height</li>
        <li>Switching between radio or checkbox input type determines whether one or many can be open at the same time</li>
        <li>Accessible and screen reader friendly. (Doesn't use display: none;)</li>
        <li>Progressively works in IE9, but without the animation (need to test this).</li>
        <li>Large clickable trigger region: The entire head section triggers the expansion of the body.</li>
        <li>Super vanilla and can easily be customized.</li>
    </ul>
</div>
              
            
!

CSS

              
                // Local SASS Variables
$accordion-CTA_HEIGHT: 12px;
$accordion-CTA_WIDTH: 30px;
$accordion-SPACING_UNIT: 15px;

body { // Some styles for presentation.
  font-family: "Old standard TT";
background: linear-gradient(to right, rgba(76,76,76,1) 0%, rgba(71,71,71,1) 0%, rgba(89,89,89,1) 0%, rgba(102,102,102,1) 0%, rgba(45,54,110,1) 78%, rgba(45,54,110,1) 100%);
	color: white;
	text-shadow: 2px 2px black;
}

.wrap {
	max-width: 600px; // Change this to experiment with it's responsiveness.
	margin: 0 auto;
}

.heading {
	text-align: center;
	text-shadow: 2px 4px black
}

// Start Main Styles
.accordion {
 border: 1px solid white;
  padding: 0 10px;
	margin: 0 auto;
  list-style: none outside;
}

.accordion > * + * {
  border-top: 1px solid white;
}

.accordion-item-hd {
  display: block;
  // Large clickable trigger is a plus
  padding: $accordion-SPACING_UNIT $accordion-CTA_WIDTH $accordion-SPACING_UNIT 0;
  position: relative;
  cursor: pointer;
  font-size: 18px;
  font-weight: bold;
}

.accordion-item-bd-wrap {
	padding-top: $accordion-SPACING_UNIT;
  margin-bottom: $accordion-SPACING_UNIT;
}

.accordion-item-input:checked ~ .accordion-item-bd {
  max-height: 600px; //It'll animate to it's natural height, but this needs to be something to accomodate all potential heights.
  transition: max-height .5s ease-in;
}

.accordion-item-input:checked ~ .accordion-item-hd > .accordion-item-hd-cta {
  transform: rotate(0);
}

.accordion-item-hd-cta {
  display: block;
  width: $accordion-CTA_WIDTH;
  position: absolute;
  top: calc(50% - #{$accordion-CTA_HEIGHT / 2} ); /*minus half font-size*/
  right: 0;
  pointer-events: none;
  transition: transform .5s ease;
  transform: rotate(-180deg);
  text-align: center;
  font-size: $accordion-CTA_HEIGHT;
  line-height: 1;
}

.accordion-item-bd {
  max-height: 0; // Closed Default: Animating max-height allows no set heights if the range is big enough.
  margin-bottom: 0;
  overflow: hidden;
  transition: max-height .3s ease-out,;
}

.accordion-item-input { //Visually hiding the form element being leveraged for it's :checked state/class.
	clip: rect(0 0 0 0);
	width: 1px;
	height: 1px;
	margin: -1;
	overflow: hidden;
	position: absolute;
	left: -9999px;
}
              
            
!

JS

              
                // Aint nothin to see here folks.
              
            
!
999px

Console