<div id="box1" data-step="1" data-intro="This is first round first step" data-round="1">...</div>
<div id="box2" data-step="2" data-intro="This is first round second step" data-round="1">...</div>
<div id="box3" data-step="3" data-intro="This is first round third step" data-round="1">...</div>
<div id="box4" data-step="1" data-intro="This is second round first step" data-round="2">...</div>
<div id="box5" data-step="2" data-intro="This is second round second step" data-round="2">...</div>
<div id="box6" data-step="3" data-intro="This is second round third step" data-round="2">...</div>