WEB骇客
<div class="box box1"></div>
<div class="box box2"></div>
.box {
    height:100px;
    width:100px;
} 
.box1 {
    background:orange;
    will-change:transform;
} 
.box2 {
    background:teal;
    margin-top:-100px;
}
body{ margin:2rem; }
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