und-color: green;
}
.collapsed {
    margin-block-start: 50px;
    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('container > item')">
    <div id="target">
        <container class="outer">
            <container>
                <item data-offset-y="8"></item>
                <item data-offset-y="58" class="collapsed"></item>
      