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chromium/third_party/blink/web_tests/external/wpt/css/css-box/margin-trim/block-container-block-end-self-collapsing-children-offsets-vert-lr.html 

<!DOCTYPE html>
<html>
<head>
<link rel="author" title="Sammy Gill" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
<meta name="assert" content="self-collapsing children at end of block with margin-trim block-end should be positioned at the bottom of the block container">
<style>
body {
    writing-mode: vertical-lr;
}
container {
    display: block;
    margin-trim: block;
    margin-block-end: 10px;
}
item {
    display: block;
    margin-block-end: 40px;
    inline-size: 50px;
    block-size: 50px;
    background-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>
            <item data-offset-x="8"></item>
            <item data-offset-x="58" class="collapsed"></item>
            <item data-offset-x="58" class="collapsed"></item>
        </container>
    </div>
</body>
</html>