css/css-box/margin-trim/grid-block.html

<!DOCTYPE html>
<html>
<head>
<title>margin-trim: grid-block</title>
<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-grid">
<link rel="match" href="/css/reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="block should trim block-start margin of items on first row and block-end margins of items on last row">
<style>
grid {
    display: inline-grid;
    grid-template-columns: auto auto;
    margin-trim: block;
}
item {
    display: block;
    background-color: green;
    width: 50px;
    height: 50px;
}
.block-start-margin {
    margin-block-start: 10px;
}
.block-end-margin {
    margin-block-end: 20px;
}
</style>
</head>
<body>
<p>Test passes if there is a filled green square.</p>
<grid>
<item class="block-start-margin"></item>
<item class="block-start-margin"></item>
<item class="block-end-margin"></item>
<item class="block-end-margin"></item>
</grid>
</body>
</html>