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<!DOCTYPE html>
<html>
<head>
<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-block">
<meta name="assert" content="item with border should prevent trimming within itself">
<style>
container {
display: block;
margin-trim: block;
border: 1px solid black;
margin-block-start: 10px;
}
item {
display: block;
inline-size: 50px;
block-size: 50px;
background-color: green;
}
.collapsed {
margin-block: 50px;
block-size: 0px
}
.with-border-and-margin {
border: 1px solid black;
margin-block-start: 30px;
}
</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('item')">
<container>
<item data-expected-margin-top="0" class="collapsed">
<item data-expected-margin-top="0" class="collapsed"></item>
</item>
<item class="with-border-and-margin" data-expected-margin-top="0">
<item class="with-border-and-margin" data-expected-margin-top="30"></item>
</item>
</container>
</body>
</html>
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