title: Bootstrap4 Accordion won't stay open
body: <p>All-</p>
  
  <p>I had this working on Bootstrap 3.7.7. Updated to 4.1.1. and my accordions broke. They won't stay open. The link works and the card looks like it will open and then closes itself or disappears. Like I said everything was working this morning on 3.7.7 but wanted to get to 4.1.1 before I moved forward anymore. </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>    &lt;!--Accordion wrapper--&gt;
      &lt;div class="accordion accordion-4" id="accordion1" role="tablist" aria-multiselectable="true"&gt;
          &lt;div class="card"&gt;
              &lt;div class="card-header" role="tab" id="HeadingInternet"&gt;
                  &lt;a class="card-title" data-toggle="collapse" data-parent="#accordion1" data-target="#collapse10" href="#collapse10" aria-expanded="false" aria-controls="#collapse10"&gt;
                      &lt;h3 class="mb-0 font-weight-bold"&gt;
                          Internet&lt;span class="fa fa-angle-double-down pull-right" href="#collapse10"&gt;&lt;/span&gt;
                      &lt;/h3&gt;
                  &lt;/a&gt;
              &lt;/div&gt;
              &lt;div id="collapse10" class="collapse" data-parent="#accordion1" aria-labelledby="#HeadingInternet"&gt;
                  &lt;div class="card-body"&gt;
                      &lt;p&gt;
                          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute,
                          non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch
                          3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda
                          shoreditch et.
                      &lt;/p&gt;
  
                      &lt;p&gt;
                          Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt
                          sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
                          farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them
                          accusamus labore.
                      &lt;/p&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/div&gt;
          &lt;!-- Accordion card --&gt;
          &lt;div class="card"&gt;
              &lt;div class="card-header" role="tab" id="headingTV"&gt;
                  &lt;a class="collapsed" data-toggle="collapse" href="#collapse11" data-parent="#accordion1" aria-expanded="false" aria-controls="collapse11"&gt;
                      &lt;h3 class="mb-0 black-text text-left font-weight-bold"&gt;TV&lt;span class="fa fa-angle-double-down pull-right" href="#collapse11"&gt;&lt;/span&gt;&lt;/h3&gt;
                  &lt;/a&gt;
              &lt;/div&gt;
              &lt;div id="collapse11" class="collapse" role="tabpanel" aria-labelledby="headingTV" data-parent="#accordion1"&gt;
                  &lt;div class="card-body"&gt;
                      &lt;p&gt;
                          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute,
                          non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch
                          3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda
                          shoreditch et.
                      &lt;/p&gt;
  
                      &lt;p&gt;
                          Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt
                          sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
                          farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them
                          accusamus labore.
                      &lt;/p&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/div&gt;
          &lt;!-- Accordion card --&gt;
          &lt;div class="card"&gt;
              &lt;div class="card-header" role="tab" id="headingPhone"&gt;
                  &lt;a class="collapsed" data-toggle="collapse" data-parent="#accordion1" href="#collapse12" aria-expanded="false" aria-controls="collapse12"&gt;
                      &lt;h3 class="mb-0 black-text text-left font-weight-bold"&gt;Phone&lt;span class="fa fa-angle-double-down pull-right" href="#collapse12"&gt;&lt;/span&gt;&lt;/h3&gt;
                  &lt;/a&gt;
              &lt;/div&gt;
              &lt;div id="collapse12" class="collapse" role="tabpanel" aria-labelledby="heading12" data-parent="#accordion1"&gt;
                  &lt;div class="card-body"&gt;
                      &lt;p&gt;
                          Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute,
                          non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch
                          3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda
                          shoreditch et.
                      &lt;/p&gt;
  
                      &lt;p&gt;
                          Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt
                          sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
                          farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them
                          accusamus labore.
                      &lt;/p&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/div&gt;
      &lt;/div&gt;</code></pre>
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