<!DOCTYPE html>
<html>
<head>
<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="border should protect the margins inside a nested block from trimming">
<style>
.trim {
margin-trim: block;
}
container {
display: block;
width: min-content;
outline: 1px solid blue;
}
item {
display: block;
inline-size: 50px;
block-size: 25px;
}
.collapsed {
block-size: 0px;
margin-block: 14px;
}
.border {
block-size: auto;
border: 1px solid black;
background-color: green;
margin-block-end: 20px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
</head>
<body onload="checkLayout('.collapsed')">
<div id="target">
<container class="trim">
<!-- Since this item has a border, the margins inside cannot collapse through
and should not be trimmed. However, its block-end border that was set
from the style should be trimmed. -->
<item class="border">
<item style="margin-block: 10px;"></item>
<item data-offset-y="58" class="collapsed"></item>
</item>
<item data-offset-y="59" class="collapsed" style="margin-block: 5px 8px;"></item>
</container>
</div>
</body>
</html>
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