chromium/third_party/blink/web_tests/scrollbars/hidden-scrollbar-prevents-layout.html

<head>
    <style>
        #overflow::-webkit-scrollbar {
            visibility: hidden;
        }
    </style>
</head>
<body style="height: 200%">
    <p>
        Test for <i><a href="https://bugs.webkit.org/show_bug.cgi?id=48154">https://bugs.webkit.org/show_bug.cgi?id=48154</a>
        <a href="rdar://problem/8251616">&lt;rdar://problem/8251616></a> Layout not updating in a subtree when a scrollbar is hidden in a flexbox descendant</i>.
    </p>
    <p>
        There should be no red on this page.
    </p>
    <p id="result">Test did not run.</p>
    <div style="display: -webkit-box; -webkit-box-orient: vertical;">
        <div> <!-- this is going to end up marked for layout after initial layout -->
            <div id="target" style="width: 100px; height: 100px; background-color: red;"></div>
            <div id="overflow" style="overflow: auto; height: 100px; width: 100px;">
                <div style="height: 150px;"></div>
            </div>
        </div>
    </div>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        function test()
        {
            var target = document.getElementById("target");
            target.style.height = "0";
            document.getElementById("result").innerText = target.offsetHeight == 0 ? "PASS" : "FAIL";
        }

        document.body.offsetTop;
        test();
    </script>
</body>