Example markup of Collapsible Section field with section description within section title bar

gf-collapsible-section-field-description-title-example.html

<li id="field_x" class="gfield gsection collapsible-sections-field collapsible-sections-description-title">
	<h2 class="gsection_title">Section Title</h2>
	<div class="gsection_description">Section Description</div>
</li>
<div class="collapsible-sections-collapsible-body" id="collapsible-section_x">
	<li id="field_x" class="gfield">
		<label class="gfield_label" for="input_x">Field Label</label>
		<div class="ginput_container">
			<input name="input_x" id="input_x" type="text" value="" class="medium">
		</div>
	</li>
	<!-- remaining fields in section... -->
</div>