bootstrap initially collapsed element

I am using the bootstrap template and I would like to change the way the accordion works by default.

How can I get the toggle to be closed when page is first seen (upon load)?

<div class="accordion-heading">
    <a class="accordion-toggle"
       data-toggle="collapse"
       data-parent="#accordion2"
       href="#collapseOne">Open!</a>
</div>
<div id="collapseOne" class="accordion-body collapse in">
    <div class="span6">
        <div class="well well-small">
            <div class="accordion-toggle">
                ...some text...
            </div>
        </div>
    </div>
    <div class="span2"></div>                            
</div>

When you expand or collapse accordion it just adds/removes a class "in" and sets the height:auto or 0 to the accordion div.

Demo

So in your accordion when you define it just remove "in" class from the div as below. Whenever you expand an accorion it just adds the "in" class to make it visible.

If you render the page with "in" bootstrap looks for the class and it will make the div's height:auto, if it not present it will be at zero height.

<div id="collapseOne" class="accordion-body collapse">

You need to remove "in" from "collapse in"

another solution is to add toggle=false to the collapse target, this will stop it randomly opening and closing which happens if you just remove the "in"

eg

<div class="accordion-heading">
    <a class="accordion-toggle"
        data-toggle="collapse"
        data-parent="#accordion2"
        href="#collapseOne">Open!</a>
</div>
<div
    id="collapseOne"
    class="accordion-body collapse"
    data-toggle="false"
    >
    <div class="span6">
        <div class="well well-small">
            <div class="accordion-toggle">
                ...some text...
            </div>
        </div>
    </div>
    <div class="span2"></div>                            
</div>

Just add class "show" to the collapsing element's class, bootstrap will use js dynamically to remove it to collapse and show

need to delete show from class:

<div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordion">

It have to be

<div id="collapseOne" class="collapse" aria-labelledby="headingOne" data-parent="#accordion">

I just added class hide to the div before "card-body" and it hidden by default.

<div id="collapseOne" class="collapse hide" aria-labelledby="headingOne" data-parent="#accordion">

There is a class in accordian which just adjust height from height:auto or 0 to the accordian div.

if you remove 'in' class and when you click on it, bootstrap adds 'in' class again and now content will be visible

<div id="collapseOne" class="accordion-body collapse">
....
</div>

For bootstrap v4+, instead of removing the "in" class, you need to remove the "show" class

<div id="accordion">
 <div class="card">
  <div class="card-header" id="headingOne">
   <h5 class="mb-0">
    <button class="btn btn-link" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
      Collapsible Group Item #1
    </button>
   </h5>
 </div>

 <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordion">
  <div class="card-body">
    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. 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 sustainable VHS.
  </div>
</div>

If removing the in class doesn't work for you, such was my case, you can force the collapsed initial state using the CSS display property:

...
<div id="collapseOne" class="accordion-body collapse" style="display: none;">
...