<!DOCTYPE html>
<html>
<head>
<link rel="author" href="mailto:sammy.gill@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-box-4/#margin-trim-flex">
<meta name="assert" content="Flex items react to change in their flexbox's margin-trim value">
<style>
flexbox {
display: flex;
width: min-content;
flex-wrap: wrap;
border: 1px solid black;
}
item {
display: block;
background-color: green;
width: 50px;
height: 50px;
}
.margin {
margin-inline-end: 10px;
}
</style>
</head>
<body>
<flexbox>
<item class="margin"></item>
</flexbox>
<flexbox>
<item></item>
</flexbox>
</body>
</html>