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chromium/third_party/blink/web_tests/external/wpt/css/css-box/margin-trim/block-container-block-start-collapsed-margins.html 

<!DOCTYPE html>
<html>
<head>
<title>margin-trim: block-container-block-start-collapsed-margins</title>
<link rel="author" title="Sammy Gill" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-block">
<link rel="match" href="block-container-block-start-collapsed-margins-ref.html">
<meta name="assert" content="second item propagates block-start margin through self collapsing item and gets trimmed">
<style>
container {
    display: block;
    margin-trim: block;
    margin-block-start: 10px;
}
item {
    display: block;
    margin-block-start: 40px;
    width: 50px;
    height: 50px;
    background-color: green;
}
.collapsed {
    margin-block-start: 0px;
    height: 0px;
}
</style>
</head>
<body>
<item style="margin-block-start: 0px;"></item>
<container>
    <item class="collapsed"></item>
    <item></item>
</container>
</body>
</html>