block-container-block-start.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-box/margin-trim/computed-margin-values/block-container-block-start.html - WPT Dashboard Interop Dashboard

<!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="block-start margin of item should be trimmed">

<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

</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 style="margin-top: 30px;" data-expected-margin-top="0"></item>

    </container>

</body>

</html>