PNG格式小图标的CSS任意颜色赋色技术

.icon {
display: inline-block;
width: 20px; height: 20px;
overflow: hidden;
}
.icon-del {
background: url(delete.png) no-repeat center;
}
.icon > .icon {
position: relative;
left: -20px;
border-right: 20px solid transparent;
-webkit-filter: drop-shadow(20px 0);
filter: drop-shadow(20px 0);
}

<p><strong>原始图标</strong></p>
<i class="icon icon-del"></i>
<p><strong>可以变色的图标</strong></p>
<i class="icon"><i class="icon icon-del"></i></i>