wpt/css/css-box/margin-trim/computed-margin-values/block-container-block-start-self-collapsing-nested.html at fa5393bb9f5f7d41cc16d1aeede1809ccd378ac0 · web-platform-tests/wpt · GitHub

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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="self-collapsing items at block start should have margins trimmed along with first non self-collapsing child block-start margins">
<style>
container {
    display: block;
    margin-trim: block;
    border: 1px solid black;
    margin-block-start: 10px;
}
item {
    display: block;
    inline-size: 50px;
    background-color: green;
}
.collapsed {
    margin-block-start: 50px;
    block-size: 0px
}
</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('container, item');">
    <container data-expected-margin-top="10">
        <item data-expected-margin-top="0" class="collapsed">
            <item data-expected-margin-top="0" class="collapsed"></item>
        </item>
        <item data-expected-margin-top="0" style="margin-block: 40px">
            <item data-expected-margin-top="0" data-expected-margin-bottom="0" class="collapsed"></item>
            <item data-expected-margin-top="0" style="margin-top: 30px;">
                <item data-expected-margin-top="0" style="margin-block-start: 100px; height: 50px;"></item>
            </item>
        </item>
    </container>
</body>
</html>