{mouseup,14}{mousedown,0}{mousedown,0}click on a "checkbox" widget. <body ref="0"><form id="mturk_form" ref="1"><div id="wrap" ref="2"><div id="area" ref="3"><div ref="4"></DIV><div ref="6"><label ref="13"><input type="checkbox" recordingtarget="true" value="false" ref="14">