filter:box-shadow

回答: filter:box-shadow 是一个错误的写法，正确的写法应该是 box-shadow。而 box-shadow 是用来给元素添加投影效果的CSS属性。box-shadow 属性的语法是：box-shadow: h-shadow v-shadow blur spread color inset。其中 h-shadow 表示阴影的水平位置，v-shadow 表示阴影的垂直位置，blur 表示阴影的模糊半径，spread 表示阴影的扩展半径，color 表示阴影的颜色。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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