.del-box{overflow:hidden;width:40px;height:40px;}????
.del-ico{position:relative;left:-40px;display:inline-block;width:80px;height:40px;border-right:40px?solid?transparent;filter:drop-shadow(40px?0?#ff0);}

<div?class="del-box">				
????<img?class="del-ico"?src="../../../img/icon/del.png"?alt="">			
</div>

隱藏元素的話使用display: none;