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<!DOCTYPE html>
<style>
section {
width: 300px;
height: 100px;
border: blue 1px solid;
}
.cb {
position: relative;
}
abs {
position: absolute;
background: purple;
width: 100px;
height: 50px;
}
abs.p0 {
top: 0; left: 0;
background: blue;
}
</style>
<body>
<section>
123
<span class="cb">
456<br>
7
<abs></abs>
<abs class="p0"></abs>
</span>
</section>
<!-- Same -->
<section>
123
<span class="cb">
456<br>
7
<abs></abs>
<abs class="p0"></abs>
</span>
</section>
</body>