Bootstrap Accordion Always Open

How to use this Bootstrap snippet

This is the first item's accordion body. It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the .accordion-body, though the transition does limit overflow.

This is the second item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the .accordion-body, though the transition does limit overflow.

This is the third item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the .accordion-body, though the transition does limit overflow.

How to use this Bootstrap Accordion Always Open

Place the code in the <body> for Interface 
          
<!-- Accordion 3 - Bootstrap Brain Component -->
<section class="py-3 py-md-5">
  <div class="container">
    <div class="row">
      <div class="col-12">
        <div class="accordion" id="accordionPanelsStayOpenExample">
          <div class="accordion-item">
            <h2 class="accordion-header">
              <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#panelsStayOpen-collapseOne" aria-expanded="true" aria-controls="panelsStayOpen-collapseOne">
                Accordion Item #1
              </button>
            </h2>
            <div id="panelsStayOpen-collapseOne" class="accordion-collapse collapse show">
              <div class="accordion-body">
                <strong>This is the first item's accordion body.</strong> It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
              </div>
            </div>
          </div>
          <div class="accordion-item">
            <h2 class="accordion-header">
              <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#panelsStayOpen-collapseTwo" aria-expanded="false" aria-controls="panelsStayOpen-collapseTwo">
                Accordion Item #2
              </button>
            </h2>
            <div id="panelsStayOpen-collapseTwo" class="accordion-collapse collapse">
              <div class="accordion-body">
                <strong>This is the second item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
              </div>
            </div>
          </div>
          <div class="accordion-item">
            <h2 class="accordion-header">
              <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#panelsStayOpen-collapseThree" aria-expanded="false" aria-controls="panelsStayOpen-collapseThree">
                Accordion Item #3
              </button>
            </h2>
            <div id="panelsStayOpen-collapseThree" class="accordion-collapse collapse">
              <div class="accordion-body">
                <strong>This is the third item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</section>
Place the <link> tag in the <head> for CSS 
          
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/css/bootstrap.min.css">
Place the <script> tag before the closing </body> for JS 
            
<script src="https://unpkg.com/[email protected]/dist/js/bootstrap.bundle.min.js"></script>

We can omit the data-bs-parent attribute on each .accordion-collapse to make accordion items stay open when another item is opened.