
    margin-block-end: 10px;
}
.border {
    border: 1px solid black;
}
.collapsed {
    block-size: 0px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
</head>
<body onload="checkLayout('item')">
    <div id="target">
        <container>
            <item data-expected-margin-bottom="10"></item>
            <item data-expected-margin-bottom="0" style="block-size: auto;">
             