The code copy is as follows:
<a href="javascript:void(0);" id="open" onclick="document.getElementById('content').style='display:block';
document.getElementById('open').style='display:none';
document.getElementById('hidden').style='display:block;'" style="display:block">Expand</a>
<a href="javascript:void(0);" id="hidden" type="hidden" onclick="document.getElementById('content').style='display:none';
document.getElementById('hidden').style='display:none';
document.getElementById('open').style='display:block';" style="display:none">Close</a>
<div id="content" style="display:none">
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</div>