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HTML 

              
                    <svg xmlns="http://www.w3.org/2000/svg" style="display:none"><symbol id="toko" viewBox="0 0 24 24"><path d="M0 0h24v24H0z" fill="none"/><path d="M4 10v7h3v-7H4zm6 0v7h3v-7h-3zM2 22h19v-3H2v3zm14-12v7h3v-7h-3zm-4.5-9L2 6v2h19V6l-9.5-5z"/></symbol><symbol id="call" viewBox="0 0 24 24"><path d="M0 0h24v24H0z" fill="none"/><path d="M6.62 10.79c1.44 2.83 3.76 5.14 6.59 6.59l2.2-2.2c.27-.27.67-.36 1.02-.24 1.12.37 2.33.57 3.57.57.55 0 1 .45 1 1V20c0 .55-.45 1-1 1-9.39 0-17-7.61-17-17 0-.55.45-1 1-1h3.5c.55 0 1 .45 1 1 0 1.25.2 2.45.57 3.57.11.35.03.74-.25 1.02l-2.2 2.2z"/></symbol><symbol id="postcard" viewBox="0 0 24 24"><path d="M19 7h-8v6h8V7zm2-4H3c-1.1 0-2 .9-2 2v14c0 1.1.9 1.98 2 1.98h18c1.1 0 2-.88 2-1.98V5c0-1.1-.9-2-2-2zm0 16.01H3V4.98h18v14.03z"/><path d="M0 0h24v24H0z" fill="none"/></symbol><symbol id="email" viewBox="0 0 24 24"><path d="M20 4H4c-1.1 0-1.99.9-1.99 2L2 18c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4l-8 5-8-5V6l8 5 8-5v2z"/><path d="M0 0h24v24H0z" fill="none"/></symbol><symbol id="website" viewBox="0 0 24 24"><path d="M0 0h24v24H0z" fill="none"/><path d="M10.09 15.59L11.5 17l5-5-5-5-1.41 1.41L12.67 11H3v2h9.67l-2.58 2.59zM19 3H5c-1.11 0-2 .9-2 2v4h2V5h14v14H5v-4H3v4c0 1.1.89 2 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2z"/></symbol></svg>

    <header class="header container">
      <h1>Accordion Module</h1>
    </header>


    <main class="main container">
    <section class="section" id="section">

      <div class="Accordion" data-accordion-1>
        <h3 class="accordion_header" data-title><button class="accordion_button" type="button">Alorem</button></h3>
        <div class="accordion_content accordion_content-contact" data-content>
          <h4 class="accordion_label">Alorem</h4>
          <ul class="accordion_contact-list">
            <li><svg class="icon-svg-use"><use xlink:href="#toko"></use></svg>ALorem Ipsum</li>
            <li>Street 45</li>
            <li>1234 AB Town</li>
            <li><svg class="icon-svg-use"><use xlink:href="#postcard"></use></svg>Postbox 123</li>
            <li>1234 AB City</li>
            <li><svg class="icon-svg-use"><use xlink:href="#call"></use></svg>123 456 78 90</li>
            <li><svg class="icon-svg-use"><use xlink:href="#email"></use></svg>info@example.com</li>
            <li><svg class="icon-svg-use"><use xlink:href="#website"></use></svg><a href="http://example.com/">http://example.com/</a></li>
          </ul>

          <p>The <a href="#!">contact page</a> gives extra information about opening times office, banknumbers etc. &hellip;</p>
        </div><!-- .accordion_content -->
      </div><!-- .Accordion -->

      <div class="Accordion" data-accordion-2>
        <h3 class="accordion_header" data-title><button class="accordion_button" type="button">Blorem</button></h3>
        <div class="accordion_content accordion_content-contact" data-content>
          <h4 class="accordion_label">Blorem</h4>
          <ul class="accordion_contact-list">
            <li><svg class="icon-svg-use"><use xlink:href="#toko"></use></svg>ALorem Ipsum</li>
            <li>Street 45</li>
            <li>1234 AB Town</li>
            <li><svg class="icon-svg-use"><use xlink:href="#postcard"></use></svg>Postbox 123</li>
            <li>1234 AB City</li>
            <li><svg class="icon-svg-use"><use xlink:href="#call"></use></svg>123 456 78 90</li>
            <li><svg class="icon-svg-use"><use xlink:href="#email"></use></svg>info@example.com</li>
            <li><svg class="icon-svg-use"><use xlink:href="#website"></use></svg><a href="http://example.com/">http://example.com/</a></li>
          </ul>

          <p>The <a href="#!">contact page</a> gives extra information about opening times office, banknumbers etc. &hellip;</p>
        </div><!-- .accordion_content -->
      </div><!-- .Accordion -->

      <div class="Accordion" data-accordion-3>
        <h3 class="accordion_header" data-title><button class="accordion_button" type="button">Clorem</button></h3>
        <div class="accordion_content accordion_content-contact" data-content>
          <h4 class="accordion_label">Clorem</h4>
          <ul class="accordion_contact-list">
            <li><svg class="icon-svg-use"><use xlink:href="#toko"></use></svg>ALorem Ipsum</li>
            <li>Street 45</li>
            <li>1234 AB Town</li>
            <li><svg class="icon-svg-use"><use xlink:href="#postcard"></use></svg>Postbox 123</li>
            <li>1234 AB City</li>
            <li><svg class="icon-svg-use"><use xlink:href="#call"></use></svg>123 456 78 90</li>
            <li><svg class="icon-svg-use"><use xlink:href="#email"></use></svg>info@example.com</li>
            <li><svg class="icon-svg-use"><use xlink:href="#website"></use></svg><a href="http://example.com/">http://example.com/</a></li>
          </ul>

          <p>The <a href="#!">contact page</a> gives extra information about opening times office, banknumbers etc. &hellip;</p>
        </div><!-- .accordion_content -->
      </div><!-- .Accordion -->

      <div class="Accordion" data-accordion-4>
        <h3 class="accordion_header" data-title><button class="accordion_button" type="button">Dlorem</button></h3>
        <div class="accordion_content accordion_content-contact" data-content>
          <h4 class="accordion_label">Dlorem</h4>
          <ul class="accordion_contact-list">
            <li><svg class="icon-svg-use"><use xlink:href="#toko"></use></svg>ALorem Ipsum</li>
            <li>Street 45</li>
            <li>1234 AB Town</li>
            <li><svg class="icon-svg-use"><use xlink:href="#postcard"></use></svg>Postbox 123</li>
            <li>1234 AB City</li>
            <li><svg class="icon-svg-use"><use xlink:href="#call"></use></svg>123 456 78 90</li>
            <li><svg class="icon-svg-use"><use xlink:href="#email"></use></svg>info@example.com</li>
            <li><svg class="icon-svg-use"><use xlink:href="#website"></use></svg><a href="http://example.com/">http://example.com/</a></li>
          </ul>

          <p>The <a href="#!">contact page</a> gives extra information about opening times office, banknumbers etc. &hellip;</p>
        </div><!-- .accordion_content -->
      </div><!-- .Accordion -->

      <div class="Accordion" data-accordion-5>
        <h3 class="accordion_header" data-title><button class="accordion_button" type="button">Elorem</button></h3>
        <div class="accordion_content accordion_content-contact" data-content>
          <h4 class="accordion_label">Elorem</h4>
          <ul class="accordion_contact-list">
            <li><svg class="icon-svg-use"><use xlink:href="#toko"></use></svg>ALorem Ipsum</li>
            <li>Street 45</li>
            <li>1234 AB Town</li>
            <li><svg class="icon-svg-use"><use xlink:href="#postcard"></use></svg>Postbox 123</li>
            <li>1234 AB City</li>
            <li><svg class="icon-svg-use"><use xlink:href="#call"></use></svg>123 456 78 90</li>
            <li><svg class="icon-svg-use"><use xlink:href="#email"></use></svg>info@example.com</li>
            <li><svg class="icon-svg-use"><use xlink:href="#website"></use></svg><a href="http://example.com/">http://example.com/</a></li>
          </ul>

          <p>The <a href="#!">contact page</a> gives extra information about opening times office, banknumbers etc. &hellip;</p>
        </div><!-- .accordion_content -->
      </div><!-- .Accordion -->


    </section>
    </main>

    <!--     <div class="subfooter container"> -->
    <!--       <div class="login-custom" id="loginCustom"> -->
    <!--         <div class="Accordion accordion_login" id="accordionLogin" data-accordion-6> -->
    <!--  -->
    <!--           <h3 class="accordion_header" data-title><button class="accordion_button" type="button">log in</button></h3> -->
    <!--           <div class="accordion_content accordion_content-contact" data-content> -->
    <!--             <h4 class="accordion_label">log in</h4> -->
    <!--  -->
    <!--             <div class="form form-login"> -->
    <!--  -->
    <!--               <form name="loginform" id="loginform" action="#!" method="post"> -->
    <!--  -->
    <!--                 <p class="login-username"> -->
    <!--                 <label for="user_login">User</label> -->
    <!--                 <input type="text" name="log" id="user_login" class="input" value="" size="20" /> -->
    <!--                 </p> -->
    <!--                 <p class="login-password"> -->
    <!--                 <label for="user_pass">Password</label> -->
    <!--                 <input type="password" name="pwd" id="user_pass" class="input" value="" size="20" /> -->
    <!--                 </p> -->
    <!--  -->
      <!--                 <p class="login-remember"><label><input name="rememberme" type="checkbox" id="rememberme" value="forever" />Remember me</label></p>-->
    <!--                 <p class="login-submit"> -->
    <!--                 <input type="submit" name="wp-submit" id="wp-submit" class="button-primary" value="Login" /> -->
    <!--                 <input type="hidden" name="redirect_to" value="#!" /> -->
    <!--                 </p> -->
    <!--  -->
    <!--               </form> -->
    <!--               <p class="small">Password Lost? <a href="#!?action=lostpassword">ask for a new password</a></p> -->
    <!--             </div> -->
    <!--           </div> -->
    <!--         </div> -->
    <!--       </div> .login-custom -->
    <!--     </div> .subfooter -->

    <footer class="footer">
      <div class="colophon">
        <small class="small">by <a href="http://atelierbramdehaan.nl/">Bram de Haan</a> &middot; <a href="http://github.com/atelierbram/Accordion-Module/">on Github</a> &middot; <a href="https://codepen.io/atelierbram/pen/eGKNMe">on Codepen</a> adapted from <a href="https://github.com/10up/wp-component-library ">10up WP Component Library</a> and <a href="https://codepen.io/aaronbushnell/pen/eGVdzv">CSS+JS Accordion to get dynamic max-height value</a> by <a href="https://aaronmbushnell.com/">Aaron Bushnell</a></small>
      </div>
    </footer>
<a href="https://github.com/atelierbram/Accordion-Module" class="github-corner"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#2a2734;color:#fff;position:absolute;top:0;border:0;right:0;"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a>
!

CSS 

              
                $base00: #203b46;
$base01: #294956;
$base02: #5e7b87;
$base03: #6b8894;
$base04: #899ca4;
$base05: #97abb4;
$base06: #dfecf1;
$base07: #f5fcff;
$base08: #c14467;
$base09: #a0593b;
$base0A: #a19445;
$base0B: #40964a;
$base0C: #358d74;
$base0D: #119ad4;
$base0E: #6a75cd;
$base0F: #ae429f;

$red:     $base08;
$orange:  $base09;
$yellow:  $base0A;
$green:   $base0B;
$cyan:    $base0C;
$blue:    $base0D;
$violet:  $base0E;
$magenta: $base0F;

$yellow-orange: mix($yellow,$orange,50%);
$orange-red: mix($orange,$red,50%);
$red-magenta: mix($red,$magenta,50%);
$magenta-violet: mix($magenta,$violet,50%);
$violet-blue: mix($violet,$blue,50%);
$blue-cyan: mix($blue,$cyan,50%);
$cyan-green: mix($cyan,$green,50%);
$green-yellow: mix($green,$yellow,50%);

$dark01: adjust-color($base00,$lightness:-5%);
$dark02: $base00;
$dark03: $base01;
$dark04: adjust-color($base01,$lightness:5%);
$dark05: adjust-color($base01,$lightness:10%);
$dark06: adjust-color($base01,$lightness:15%);
$dark07: adjust-color($base01,$lightness:20%);
$dark08: adjust-color($base01,$lightness:25%);

$light08: adjust-color($base01,$lightness:30%);
$light07: adjust-color($base01,$lightness:35%);
$light06: adjust-color($base01,$lightness:40%);
$light05: adjust-color($base01,$lightness:45%);
$light04: adjust-color($base01,$lightness:50%);
$light03: adjust-color($base01,$lightness:55%);
$light02: adjust-color($base01,$lightness:60%);
$light01: adjust-color($base01,$lightness:65%);

$dark_yellow          : adjust-color($yellow,$lightness:-25%);
$dark_yellow-orange   : adjust-color($yellow-orange,$lightness:-23%);
$dark_orange          : adjust-color($orange,$lightness:-22%);
$dark_orange-red      : adjust-color($orange-red,$lightness:-22%);
$dark_red             : adjust-color($red,$lightness:-22%);
$dark_red-magenta     : adjust-color($red-magenta,$lightness:-23%);
$dark_magenta         : adjust-color($magenta,$lightness:-23%);
$dark_magenta-violet  : adjust-color($magenta-violet,$lightness:-26%);
$dark_violet          : adjust-color($violet,$lightness:-26%);
$dark_violet-blue     : adjust-color($violet-blue,$lightness:-30%);
$dark_blue            : adjust-color($blue,$lightness:-30%);
$dark_blue-cyan       : adjust-color($blue-cyan,$lightness:-30%);
$dark_cyan            : adjust-color($cyan,$lightness:-25%);
$dark_cyan-green      : adjust-color($cyan-green,$lightness:-28%);
$dark_green           : adjust-color($green,$lightness:-25%);
$dark_green-yellow   : adjust-color($green-yellow,$lightness: -20%);

$light_yellow         : adjust-color($yellow,$lightness:30%);
$light_orange         : adjust-color($orange,$lightness:30%);
$light_yellow-orange  : mix($light_yellow,$light_orange,50%);
$light_red            : adjust-color($red,$lightness:20%);
$light_orange-red     : mix($light_orange,$light_red,50%);
$light_magenta        : adjust-color($magenta,$lightness:20%);
$light_red-magenta    : mix($light_red,$light_magenta,50%);
$light_violet         : adjust-color($violet,$lightness:10%);
$light_magenta-violet : mix($light_magenta,$light_violet,50%);
$light_blue           : adjust-color($blue,$lightness:20%);
$light_violet-blue    : mix($light_violet,$light_blue,50%);
$light_cyan           : adjust-color($cyan,$lightness:20%);
$light_blue-cyan      : mix($light_blue,$light_cyan,50%);
$light_green          : adjust-color($green,$lightness:20%);
$light_cyan-green     : mix($light_cyan,$light_green,50%);
$light_green-yellow   : adjust-color($green-yellow,$lightness:20%);

$purple: $violet-blue;
$dark_purple: $dark_violet-blue;
$light_purple: $light_violet-blue;
$ui-bg-dark: $base01;
$ui-bg-medium: adjust-color($dark03,$lightness:17%);
$bg-blue: adjust-color($light_blue,$saturation: -66%);

*,
*:before,
*:after {
  box-sizing: inherit;
}

html {
  min-height: 100%;
  margin-bottom: 1px;
  overflow-y: scroll;
}

html,
body {
  height: 100%;
  background-color: #fff;
}
body {
  font: 100%/1.5 "Fira Sans", AvenirNext-Regular, "Segoe Ui", "Lucida Grande", Verdana, sans-serif;
  box-sizing: inherit;
  margin: 0;
  color: $dark01;
  font-weight: 400;
  min-height: 100%;
  box-sizing: border-box;
}

h1 {
  font-size: 2.5em;
  padding: 1em 0 .25em .5em;
}

h1, h3 {
  font-family: "Fira Sans", AvenirNextCondensed-Demibold, "Segoe UI", "Trebuchet MS", Tahoma, sans-serif;
  margin: 0;
  color: $base02;
  font-weight: 500;
}

img,
svg {
  border: 0;
  max-width: 100%;
  height: auto;
}

a {
  color: $blue-cyan;
}


.footer .small a {
  text-decoration: none;
  display: inline-block;
  padding: .25em;
}

.footer .small a:hover {
  background-color: $light_blue-cyan;
  color: #fff;
}

.container {
  max-width: 40em;
  margin: 0 auto;
  // overflow: auto;
  // background-color: #fff;
}

.main {
  min-height: calc(100vh - 14.5em);
  background-color: #fff;
  padding: 2em 3em;
}

.header {
  min-height: 5em;
  padding-left: 2em;
}

// .subfooter {
//   padding-top: 3em;
//   min-height: 2em;
// }

.footer {
  position: absolute;
  right:0;bottom:0;left:0;
  min-height: 3em;
  padding: 3em 2em;
  text-align: center;
  background-color: $light02;
} 

// accordion
.Accordion {
  position: relative;
  margin-top: 2px;
}

// downward triangle in pseudo-element
.accordion_button:after {
  content: "";
  position: absolute;
  top:0;right:0;bottom:0;
  margin-top: 20px;
  margin-right: .75em;
  width: 16px;
  height: 8px;
  // SVG polygoon triangle of 16px wide and 8px tall:
  background: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 12'%3E%3Cpolygon fill='rgb(31,127,142)' points='8,12 0,0 16,0'/%3E%3C/svg%3E") 0 0 no-repeat;
}

// swap downward triangle with upward triangle when active
.accordion_header.is-active .accordion_button:after {
  background: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 12'%3E%3Cpolygon fill='rgb(255,255,255)' points='8,0 16,12 0,12'/%3E%3C/svg%3E") no-repeat;
}

.accordion_button {
  display: block;
  position: relative;
  width: 100%;
  text-align: left;
  font-family: inherit;
  font-size: 1em;
  margin: 0;
  // accordion_header should be 48px hight
  padding-top: .608em;
  padding-bottom: .408em;
  padding-left: 1em;
  color: adjust-color($dark_blue-cyan, $lightness: 15%);
  background-color: $light01;
  border: none;
  cursor: pointer;
  user-select: none;
  transition: all .4s;
}

.accordion_header.is-active .accordion_button {
  background-color: $light03;
  color: #fff;
  font-weight: 300;
}

.accordion_content {
  overflow: hidden;
  transition: .2s max-height;
  will-change: max-height;
  background-color: adjust-color($light_blue-cyan, $lightness: 36%);
}

.Accordion.is-hidden .accordion_content {
  position: absolute;
  opacity: 0;
  visibility: hidden;
}

.accordion_label {
  margin: 0 0 0 2.5em;
  font-size: 1.125em;
  padding: 1.5em 0 .5em;
}

.accordion_label:focus {
  outline: none;
}
 
// browsers which dont suport max-height ondersteunen: 2.5% worldwide, will not get a nice transition http://caniuse.com/#feat=minmaxwh
.core .accordion_content {
  display: none;
}

.no-js.core .accordion_content,
.core .accordion_content.is-active {
  display: block;
}
  
.accordion_contact-list {
  margin: 0;
  padding: .5em 2.5em 1em;
  list-style: none;
}

.accordion_contact-list li {
  position: relative;
  margin: 0 0 0 -.75em;
  padding: 0 0 0 1em;
}

// .accordion_content-contact {
//   padding-top: 1em;
// }

.accordion_content-contact p {
  margin: 0;
  padding: .5em 3em 1.5em;
}

.icon-svg-use {
  position: absolute;
  top: .27em;
  left: -.5em;
  height: 16px;
  width: 16px;
  fill: adjust-color($light_blue-cyan, $hue: 7%, $lightness: -10%);
  background-color: transparent;
  border-color: transparent;
  border-radius: 0;
}

.github-corner svg[style] {
  transition: .3s all;
  fill: $base06 !important;
  color: $base04 !important;
}

.github-corner:hover svg[style] {
  fill: $base06 !important;
  color: $light_cyan !important;
}
!

JS 

              
                /********************************
https://github.com/10up/wp-component-library
	Name: WordPress Accessible Accordion
	Usage:

	TenUp.accordion( {
		target: '.accordion', // ID (or class) of accordion container
	}, function() {
		console.log( 'Amazing callback function!' );
	} );

********************************/

( function() {
  'use strict';

  // Define global TenUp object if it doesn't exist
  if ( 'object' !== typeof window.TenUp ) {
    window.TenUp = {};
  }

  // This is our global accordion index to keep unique ids
  var topIndex = 0;

  window.TenUp.accordion = function( options, callback ) {
    if ( 'undefined' === typeof options.target ) {
      return false;
    }

    var accordion = document.querySelector( options.target );

    if ( ! accordion ) {
      return;
    }

    // Simple iterator for reuse
    var forEach = function( array, callback, scope ) {
      for ( var i = 0, imax = array.length; i < imax; i++ ) {
        callback.call( scope, i, array[i] ); // passes back stuff we need
      }
    };

    var accordionContent = accordion.getElementsByClassName( 'accordion_content' ),
      accordionHeader  = accordion.getElementsByClassName( 'accordion_header' );

    topIndex++;

    forEach( accordionHeader, function( index, value ) {
      var head  = value,
        index = index + 1;

      // Set ARIA and ID attributes
      head.setAttribute( 'id', 'tab' + topIndex + '-' + index );
      head.setAttribute( 'aria-selected', 'false' );
      head.setAttribute( 'aria-expanded', 'false' );
      head.setAttribute( 'aria-controls', 'panel' + topIndex + '-' + index );
      head.setAttribute( 'role', 'tab' );

      head.addEventListener( 'click', accordionHandle );

      function accordionHandle() {

        var nextPanel = value.nextElementSibling,
          nextPanelLabel = nextPanel.getElementsByClassName( 'accordion_label' )[0];

        value.classList.toggle( 'is-active' );

        nextPanel.classList.toggle( 'is-active' );

        nextPanelLabel.setAttribute( 'tabindex', -1 );
        nextPanelLabel.focus();

        if ( nextPanel.classList.contains( 'is-active' ) ) {

          head.setAttribute( 'aria-selected', 'true' );
          head.setAttribute( 'aria-expanded', 'true' );
          nextPanel.setAttribute( 'aria-hidden', 'false' );

        } else {

          head.setAttribute( 'aria-selected', 'false' );
          head.setAttribute( 'aria-expanded', 'false' );
          nextPanel.setAttribute( 'aria-hidden', 'true' );

        }
      }
    });

    forEach( accordionContent, function( index, value ) {
      var content = value,
        index   = index + 1;

      // Set ARIA and ID attributes
      content.setAttribute( 'id', 'panel' + topIndex + '-' + index );
      content.setAttribute( 'aria-hidden', 'true' );
      content.setAttribute( 'aria-labelledby', 'tab' + topIndex + '-' + index );
      content.setAttribute( 'role', 'tabpanel' );
      //content.setAttribute( 'tabindex', '-1' );
    });

    // Execute the callback function
    if ( typeof callback === 'function' ) {
      callback.call();
    }
  }
} )();

TenUp.accordion( {
  target: '.js-accordion', // ID (or class) of accordion container
}, function() {
  // console.log( 'Amazing callback function!' );
} );

'use strict';
// https://codepen.io/aaronbushnell/pen/eGVdzv
// Simple CSS+JS dynamic max-height accordions by Aaron Bushnell https://codepen.io/aaronbushnell/
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Accordion = function () {
  function Accordion($el) {
    _classCallCheck(this, Accordion);

    this.$el = $el;
    this.$title = this.$el.querySelector('[data-title]');
    this.$content = this.$el.querySelector('[data-content]');
    this.isOpen = false;
    this.height = 0;

    this.events();
    this.close();
  }

  Accordion.prototype.events = function events() {
    this.$title.addEventListener('click', this.handleClick.bind(this));
    this.$content.addEventListener('transitionend', this.handleTransition.bind(this));
  };

  Accordion.prototype.handleClick = function handleClick() {
    this.height = this.$content.scrollHeight;

    if (this.isOpen) {
      this.close();
    } else {
      this.open();
    }
  };

  Accordion.prototype.close = function close() {
    var _this = this;

    this.isOpen = false;
    this.$el.classList.remove('is-active');
    this.$content.style.maxHeight = this.height + 'px';

    setTimeout(function () {
      _this.$content.style.maxHeight = 0 + 'px';
    }, 1);
  };

  Accordion.prototype.open = function open() {
    var _this2 = this;

    this.isOpen = true;
    this.$el.classList.add('is-active');
    this.$el.classList.remove('is-hidden');
    this.$content.style.maxHeight = 0 + 'px';

    setTimeout(function () {
      _this2.$content.style.maxHeight = _this2.height + 'px';
    }, 1);
  };

  Accordion.prototype.handleTransition = function handleTransition() {
    if (!this.isOpen) {
      this.$el.classList.add('is-hidden');
    }

    this.$content.style.maxHeight = '';
  };

  return Accordion;
}();

/*
 * Instantiate a new Accordion
*/
new Accordion(document.querySelector('[data-accordion-1]'));
new Accordion(document.querySelector('[data-accordion-2]'));
new Accordion(document.querySelector('[data-accordion-3]'));
new Accordion(document.querySelector('[data-accordion-4]'));
new Accordion(document.querySelector('[data-accordion-5]'));
!
999px

Console