opacity
:设置父元素隐藏,设置子元素显示将失效
visiblity
:设置父元素隐藏,设置子元素显示将成功
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20.item1 {
width: 400px;
height: 400px;
padding: 100px;
box-sizing: border-box;
background-color: green;
text-align: center;
/*opacity: 0;*/
visibility: hidden
}
.item2 {
width: 200px;
height: 200px;
background-color: fuchsia;
/*opacity: 1;*/
visibility: visible
}
<div class="item1">
<div class="item2"></div>
</div>