【备忘录】FF下table-cell and full width absolutely positioned children

<divclass="cell-1"> ------>display: table-cell;
　　<divclass="wrapper">
　　　　<divclass="content-1">this must be positioned absolutely</div>
　　　　<divclass="content-2">as these divs will be overlapping</div>
　　</div>
</div>
.wrapper {
  position: relative;
 }

solution: wrap content divs in another positioned div