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<!DOCTYPE html>
<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#blockwidth">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<style>
.container {
display: flow-root;
width: 100px;
padding: 5px;
box-sizing: border-box;
}
.box {
display: flow-root;
width: 40px;
height: 10px;
background: lime;
}
</style>
<body onload="checkLayout('.box')">
<div class="container">
<div class="box" style="margin: auto;" data-expected-margin-left="25" data-expected-margin-right="25"></div>
<div class="box" style="margin-left: auto;" data-expected-margin-left="50" data-expected-margin-right="0"></div>
<div class="box" style="margin-right: auto;" data-expected-margin-left="0" data-expected-margin-right="50"></div>
</div>
<div class="container" style="direction: rtl;">
<div class="box" style="margin: auto;" data-expected-margin-left="25" data-expected-margin-right="25"></div>
<div class="box" style="margin-left: auto;" data-expected-margin-left="50" data-expected-margin-right="0"></div>
<div class="box" style="margin-right: auto;" data-expected-margin-left="0" data-expected-margin-right="50"></div>
</div>
</body>
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