Accordion - Collapsable Panels - NESTED - MULTI OPEN - Bootstrap 3

by suhail

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.min.css">
<div>
<h1>
heading
</h1>
<h1>
heading
</h1><h1>
heading
</h1><h1>
heading
</h1><h1>
heading
</h1><h1>
heading
</h1><h1>
heading
</h1><h1>
heading
</h1>
<h1>
heading
</h1>
<h1>
heading
</h1>
</div>

<div class="panel-group" id="accordion1">
    <div class="panel panel-default">
        <div class="panel-heading">
             <h4 class="panel-title">
                 <a data-toggle="collapse" data-parent="#accordion1" href="#collapseOne">
                 Collapsible Group Item #1
                 </a>
             </h4>
        </div>
        <div id="collapseOne" class="panel-collapse collapse in">
            <div class="panel-body">Panel 1
            Collapsible Group Item #1
            Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1
            Collapsible Group Item #1
            Collapsible Group Item #1
            Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1
            vCollapsible Group Item #1
            Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1
            Collapsible Group Item #1
            Collapsible Group Item #1
            Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1Collapsible Group Item #1
            v
            
      ...