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#parent {
position: relative;
width: 400px;
height: 400px;
background: red;
border: 0 solid black;
}
#child {
position: absolute;
width: 100px;
left: 100px;
background: blue;
border: 0 solid black;
}
.floatTop {
width: 10px;
height: 10px;
background: green;
}