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<!doctype html>
<meta charset="UTF-8">
<title>CSS Test Reference</title>
<style>
.list-item {
margin-left: 40px;
}
</style>
<div class="list-item">
[1] A1
<div class="list-item">[1] B1</div>
<div class="list-item">[2] B2</div>
</div>
<div class="list-item">[2] A2</div>
<div class="list-item">[3] A3</div>