File: flex-column-style-change-triggers-layout-block-end.html

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<!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">
<link rel="match" href="flex-column-style-change-triggers-layout-block-end-ref.html">
<style>
flexbox {
    display: flex;
    flex-direction: column;
    width: min-content;
    flex-wrap: wrap;
    border: 1px solid black;
}
.initial-margin-trim {
    margin-trim: block-end;
}
item {
    display: block;
    background-color: green;
    width: 50px;
    height: 50px;
    margin-block-end: 10px;
}
</style>
</head>
<body>
    <flexbox class="initial-margin-trim" id="to-no-margin-trim">
        <item></item>
    </flexbox>
    <flexbox id="to-margin-trim">
        <item></item>
    </flexbox>
</body>
<script>
document.body.offsetHeight;
document.getElementById("to-no-margin-trim").style["margin-trim"] = "none";
document.getElementById("to-margin-trim").style["margin-trim"] = "block-end";
</script>
</html>