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<!DOCTYPE html>
<style>
.parent div {
background: #aaa;
width: 100%;
height: 100px;
}
</style>
There should be two grey ~squares with no red showing.
<div class="parent" style="width:100.2px">
<div></div>
</div>
<div class="parent" style="width:100.8px">
<div></div>
</div>