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chromium/third_party/blink/web_tests/external/wpt/css/css-box/margin-trim/flex-column-block-multiline.html 

<!DOCTYPE html>
<html>
<head>
<title>margin-trim: flex-column-block-multiline</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-flex">
<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="block-start should be trimmed for items at the start of the flex line and block-end should be trimmed for items at the end of the flex line">
<style>
flexbox {
    display: flex;
    width: min-content;
    height: 100px;
    flex-wrap: wrap;
    flex-direction: column;
    margin-trim: block;
}
item {
    display: block;
    background-color: green;
    width: 50px;
    height: 50px;
}
item:nth-child(odd) {
    margin-block-start: 25px;
}
item:nth-child(even) {
    margin-block-end: 25px;
}
</style>
</head>
<body>
<p>Test passes if there is a filled green square.</p>
<flexbox>
<item></item>
<item></item>
<item></item>
<item></item>
</flexbox>
</body>
</html>