<!DOCTYPE html>
<html>
<head>
<title>margin-trim: flex-column-block-multiline</title>
<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">
</head>
<body>
<p>Test passes if there is a filled green square.</p>
<div style="width:100px; height: 100px; background-color: green;"></div>
</body>
</html>
