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chromium/third_party/blink/web_tests/external/wpt/css/css-box/margin-trim/block-container-block-start-self-collapsing-item-has-larger-block-end-ref.html 

<!DOCTYPE html>
<html>
<head>
<title>margin-trim: block-container-block-start-self-collapsing-item-has-larger-block-end</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">
<meta name="assert" content="self-collapsing margin at block-start has its block-end margin trimmed which would normally be used in collapsing with container">
<style>
container {
    display: block;
    margin-trim: block;
    margin-block-end: 10px;
}
item {
    display: block;
    width: 50px;
    height: 50px;
    background-color: green;
}
.collapsed {
    margin-block-end: 0px;
    height: 0px;
}
</style>
</head>
<body>

</body>
</html>
<container>
    <item></item>
    <item class="collapsed"></item>
</container>
<item></item>