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chromium/third_party/blink/web_tests/external/wpt/css/css-box/margin-trim/computed-margin-values/block-container-block-start-child-with-border.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="item with border should prevent trimming within itself">
<style>
container {
    display: block;
    margin-trim: block;
    border: 1px solid black;
    margin-block-start: 10px;
}
item {
    display: block;
    inline-size: 50px;
    block-size: 50px;
    background-color: green;
}
.collapsed {
    margin-block: 50px;
    block-size: 0px
}
.with-border-and-margin {
    border: 1px solid black;
    margin-block-start: 30px;
}
</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')">
    <container>
        <item data-expected-margin-top="0" class="collapsed">
            <item data-expected-margin-top="0" class="collapsed"></item>
        </item>
        <item class="with-border-and-margin" data-expected-margin-top="0">
            <item class="with-border-and-margin" data-expected-margin-top="30"></item>
        </item>
    </container>
</body>
</html>