Hide bootstrap show toggle s'effondrer
<p>
<a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
Link with href
</a>
</p>
<div class="collapse" id="collapseExample">
<div class="card card-body">
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</div>
</div>
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