<!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;
outline: 1px solid blue;
}
container {
display: block;
width: min-content;
}
item {
display: block;
inline-size: 50px;
block-size: 10px;
background-color: green;
}
.collapsed {
block-size: 0px;
margin-block: 10px;
}
.border {
block-size: auto;
border: 10px solid black;
margin-block-end: 25px;
}
</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">
<container>
<item></item>
<!-- This item's block-end margin should be trimmed
since it will collapse through to the outer container-->
<container style="margin-block-end: 300px;">
<!-- However the margins inside this item cannot collapse through due to
the border and should not be trimmed -->
<container class="border">
<item style="margin-block-end: 20px;"></item>
<item data-offset-y="58" class="collapsed"></item>
</container>
<item data-offset-y="68" class="collapsed"></item>
</container>
</container>
<item data-offset-y="68" class="collapsed"></item>
</container>
</div>
</body>
</html>
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